EXAMEN BREVET OFITER MECANIC - MIAE

1.A bus disconnect link is used to isolate

2.A capacitor can be tested using a megohmmeter or an ohmmeter If the meter is connected to a shorted capacitor, the meter pointer should

3.A circuit with a blown fuse would be described as a/an

4.A common type of protective covering used on electrical conductors is

5.A device which can be used to check the calibration of a circuit breaker is a

1. one bus bar from another nmlkj

2. the generator circuit breaker from the bus nmlkj

3. different phases from the equalizer connection nmlkj

4. positive and negative buses from the neutral nmlkj

1. immediately swing to the maximum resistance value for the capacitor nmlkj

2. first swing quickly to 'zero', then gradually move up the scale as the capacitor charges

nmlkj

3. immediately deflect to and remain at zero nmlkj

4. immediately swing to a high reading and then gradually decrease nmlkj

1. short circuit nmlkj

2. open circuit nmlkj

3. bonded circuit nmlkj

4. grounded circuit nmlkj

1. plain paper nmlkj

2. fibrous braid nmlkj

3. silver sheathing nmlkj

4. babbitt sheathing nmlkj

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23.10.2008file://C:\Documents and Settings\administrator.LOCALDOMAIN\Local Settings\Tem...

6.A device which prints out a permanent record of the plant operating conditions is known as the

7.A 'dielectric' is a/an

8.A fuse will "blow" if

9.A galvanometer is an instrument used to measure

1. 500 volt megohmmeter nmlkj

2. portable low voltage high current testing unit nmlkj

3. standard digital multimeter nmlkj

4. clamp-on voltmeter nmlkj

1. analogger nmlkj

2. bell logger nmlkj

3. alarm logger nmlkj

4. data logger nmlkj

1. electrical insulator nmlkj

2. current flow nmlkj

3. good conductor nmlkj

4. semiconductor material nmlkj

1. an electric motor is stopped suddenly by opening a switch nmlkj

2. the flow of current to the protection device is reversed nmlkj

3. the electrical current exceeds the rated value of the fuse nmlkj

4. unequal resistors are connected in parallel nmlkj

1. thickness of galvanized metal nmlkj

2. resistance of electrical wiring insulation nmlkj

3. very small amounts of current or voltage nmlkj

4. quantity of galvans in an electric circuit nmlkj

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10.A ground can be defined as an electrical connection between the wiring of a motor and its

11.A grounded switch or cable will be indicated by a megohmmeter reading of

12.A megohmmeter can be used to test for

13.A megohmmeter is connected to each end of an individual motor winding A low ohm reading indicates

14.A megohmmeter is used to measure

1. shunt field nmlkj

2. circuit breaker nmlkj

3. metal framework nmlkj

4. interpole nmlkj

1. infinity nmlkj

2. 'zero' nmlkj

3. being unsteady in the high range nmlkj

4. being unsteady in the low range nmlkj

1. an open field coil nmlkj

2. synchronous speed nmlkj

3. undercut mica nmlkj

4. reversed polarity nmlkj

1. an open coil nmlkj

2. a loose coil nmlkj

3. good continuity nmlkj

4. a dirty coil nmlkj

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15.A multimeter may be damaged by taking a

16.A replacement wire having twice the length and one-half the cross-sectional area of the original wire will have a resistance that is

17.A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method Therefore, the meters should be connected with

18.A resistor placed in parallel to the output of a power supply

1. voltage nmlkj

2. insulation resistance values nmlkj

3. current nmlkj

4. power nmlkj

1. voltage reading while in the ammeter mode nmlkj

2. current reading while in the voltmeter mode nmlkj

3. resistance reading while in the ammeter mode nmlkj

4. resistance reading while in the voltmeter mode nmlkj

1. four times that of the original wire nmlkj

2. twice that of the original wire nmlkj

3. the same as that of the original wire nmlkj

4. one-half that of the original wire nmlkj

1. both meters in series with the resistance nmlkj

2. both meters in parallel with the resistance nmlkj

3. the ammeter in series and the voltmeter in parallel with the resistance nmlkj

4. the ammeter in parallel and the voltmeter in series with the resistance nmlkj

1. is a temperature compensator nmlkj

2. corrects power factor nmlkj

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19.A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected, this is caused by

20.A switchboard for an AC electrical system requires the use of which of the following devices?

21.A switchboard, for a AC electrical distribution system, will be provided with which of the following components?

22.A wattmeter is used to determine

3. prevents excessive currents nmlkj

4. aids in output voltage regulation nmlkj

1. mechanical misalignment of the meter pointer nmlkj

2. a poor ground for the meter case nmlkj

3. static electricity in the air nmlkj

4. capacitors inside the meter storing charges nmlkj

1. Frequency meter. nmlkj

2. Ohmmeter. nmlkj

3. Induction voltage regulator. nmlkj

4. Current transformer governor. nmlkj

1. Frequency meter. nmlkj

2. Ammeter nmlkj

3. Voltmeter nmlkj

4. All of the above nmlkj

1. the power being consumed by electrical equipment nmlkj

2. partial circuit resistance nmlkj

3. current flowing in a circuit nmlkj

4. voltage existing between two points in a circuit nmlkj

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23.AC circuits develop resistance, inductance, and capacitance The inductive reactance of a circuit is expressed in

24.AC voltmeters are generally calibrated to read the

25.Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will

26.All electric cables passing through watertight bulkheads must be

27.Alternating current circuits develop resistance, inductance and capacitance The inductance of a coil is expressed in

1. ohms nmlkj

2. mhos nmlkj

3. henrys nmlkj

4. farads nmlkj

1. instantaneous voltage nmlkj

2. average voltage nmlkj

3. RMS voltage nmlkj

4. peak voltage nmlkj

1. result in immediate power outages nmlkj

2. damage circuit breakers nmlkj

3. appear on the ground detection system nmlkj

4. damage insulation and may cause outages nmlkj

1. installed with watertight stuffing tubes nmlkj

2. grounded on both sides of the bulkhead nmlkj

3. fitted with unions on each side of the bulkhead nmlkj

4. welded on both sides of the bulkhead nmlkj

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28.An AC circuit has capacitance arranged in series If the line voltage remains constant, the capacitive reactance value can be varied by changing the

29.An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an

30.An across-the-line starter is typically used for which of the following applications?

31.An ammeter should be used to measure

1. ohms nmlkj

2. mhos nmlkj

3. henrys nmlkj

4. farads nmlkj

1. line frequency nmlkj

2. resistance nmlkj

3. number of commutating poles nmlkj

4. number of interpoles nmlkj

1. open circuit nmlkj

2. short circuit nmlkj

3. polarized ground nmlkj

4. ground reference point nmlkj

1. Reduced-current starting of large motors nmlkj

2. Low torque starting of small motors nmlkj

3. Low resistance starting of DC motors nmlkj

4. Full-voltage starting of motors nmlkj

1. the voltage between two points in a circuit nmlkj

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32.An electrical component is connected across a 120 volt 60 hertz AC supply What is the current drawn by the component if the impedance is 200 ohms?

33.An ohmmeter can be used to measure

34.Any electric motor can be constructed to be

35.As shown in the illustration EL-0026, the symbol is used in electrical drawings to designate a

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2. circuit continuity nmlkj

3. current flow in a circuit nmlkj

4. total or partial circuit resistance nmlkj

1. 0.01 amperes nmlkj



4. 100 amperes nmlkj

1. current flow in a circuit nmlkj

2. voltage between two points in a circuit nmlkj

3. circuit continuity nmlkj

4. power nmlkj

1. short proof nmlkj

2. ground proof nmlkj

3. explosion proof nmlkj

4. overload proof nmlkj

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36.As shown in the illustration EL-0079, the direction of electron flow through the component is

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1. limit switch with one set of normally open contacts nmlkj

2. maintaining type push button with an electrical interlock nmlkj

3. sustaining type push button with a mechanical interlock nmlkj

4. normally closed contact held open mechanically by an interlock nmlkj

1. from terminal "B" to terminal "A" nmlkj

2. from terminal "A" to terminal "B" nmlkj

3. determined by the polarity of the applied voltage nmlkj

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37.As shown in the illustration, which of the symbols represents a normally closed electrical contact?

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38.Before measuring an unknown resistance with an ohmmeter, you should

39.Before testing insulation with a megohmmeter, the windings of large machines should be grounded for about 15 minutes just prior to the test, because the

4. opposite from that in a resistor nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

1. adjust the meter's pointers to mid-scale nmlkj

2. change the meter's batteries nmlkj

3. center the meter's pointer at infinity nmlkj

4. short the test leads and calibrate the meter nmlkj

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40.Burning of controller contacts, when opening, is prevented by

41.Capacitors are used on the output of the power supply in today's consoles to

42.Capacitors can be used in electric distribution systems to improve power factor This is accomplished by seesawing energy between the capacitor and the

43.Cleaning of electrical insulation should be

1. static charge of the machine may give a false reading nmlkj

2. armature will have a greater number of leakage paths nmlkj

3. insulation may be damaged nmlkj

4. insulation may be covered with moisture nmlkj

1. coating the contact surfaces lightly with petroleum jelly nmlkj

2. magnetic blowout coils nmlkj

3. an overvoltage release nmlkj

4. an overcurrent release nmlkj

1. filter out 'ripple' nmlkj

2. prevent overloads nmlkj

3. act as a permanent load nmlkj

4. decrease the average value of the output voltage nmlkj

1. generator nmlkj

2. inductive loads nmlkj

3. resistive loads nmlkj

4. all of the above nmlkj

1. done every six months nmlkj

2. accomplished every 12 months nmlkj

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44.Component F in the illustrated EL-0033 device is for

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45.Copper is often used as an electrical conductor because it

46.During maintenance of circuit breakers,

3. determined by need and not the calendar nmlkj

4. performed whenever the electrician is not otherwise busy nmlkj

1. short circut protection nmlkj

2. latching the trip unit closed after resetting the breaker nmlkj

3. overload protection nmlkj

4. providing a flexible connection between the input terminal G and the tripping unit E

nmlkj

1. has high resistance at low temperatures nmlkj

2. has a highly polished surface nmlkj

3. is able to pass current with little opposition nmlkj

4. holds insulation together well nmlkj

1. always smooth roughened contact surfaces with a file nmlkj

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47.Electric cables are formed of stranded wire to

48.Electrical insulation is classed by the

49.Electrical power is expressed in

50.External shunts are sometimes used with ammeters to

2. never pass more than rated breaker current through the overload heater element

nmlkj

3. inspect for wear and misalignment of main contacts nmlkj

4. assume heater elements installed are of correct size nmlkj

1. increase the current carrying capability for a given size wire nmlkj

2. increase their flexibility nmlkj

3. decrease the weight for a given size wire nmlkj

4. assure good conductivity at junction points nmlkj

1. International Association of Electrical Manufacturers nmlkj

2. approximate operating voltage and current expected nmlkj

3. International Standards Organisation nmlkj

4. temperature stability of the manufacturing material(s) nmlkj

1. ohms nmlkj

2. volts nmlkj

3. amps nmlkj

4. watts nmlkj

1. increase meter sensitivity nmlkj

2. permit shunts with larger resistances to be utilized nmlkj

3. prevent damage to the meter movement from heat generated by the shunt nmlkj

4. enable the construction of a compact meter with a virtually unlimited range

nmlkj

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51.Four lamps are connected in parallel in a single circuit If one of the lamp burns out, the others will

52.Fuses are usually rated in

53.Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an

54.Grounds occurring in electrical machinery as a result of insulation failure may result from

55.Handheld phase sequence indicators are useful when

1. all go out nmlkj

2. become dimmer nmlkj

3. burn with their original intensities nmlkj

4. become brighter nmlkj

1. watts nmlkj

2. amps only nmlkj

3. volts only nmlkj

4. amps and volts nmlkj

1. small wire brush nmlkj

2. compressed air jet nmlkj

3. clean dry cloth nmlkj

4. 10% solution carbon solvent and water nmlkj

1. deterioration through extended use nmlkj

2. excessive heat nmlkj

3. extended periods of vibration nmlkj


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56.Hand-portable phase sequence indicators should be used when

57.How is a wattmeter electrically connected in a circuit?

58.If a voltage tester is being used to check for defective fuses in the circuit, shown in the illustration EL-0062, which of the readings will indicate that fuse #2 is open?

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1. preparing to parallel alternators nmlkj

2. connecting lighting branch circuits nmlkj

3. troubleshooting DC motors nmlkj

4. connecting shore power lines to the ship nmlkj

1. installing a new synchroscope nmlkj

2. preparing to make the shore power connection nmlkj

3. replacing a defective solenoid nmlkj


1. In series nmlkj

2. In parallel nmlkj

3. In series-parallel nmlkj

4. Inductively nmlkj

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59.If fuse #1 shown in the illustration EL-0062 is defective, a voltage tester connected across points "C" and "B" will

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1. C-B full voltage nmlkj

2. A-D full voltage nmlkj

3. A-D no voltage nmlkj

4. C-B no voltage nmlkj

1. show a reading of 55 volts nmlkj

2. show full line voltage across fuse #2 nmlkj

3. give positive indication that fuse #2 is good nmlkj

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60.If fuse 'F-1' in the illustrated schematic diagram opens,

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61.If many turns of an alternating current coil for a contactor become short circuited, the coil

62.If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be

4. show a reading of zero volts nmlkj

1. the motor will run slowly nmlkj

2. 'A-1' and 'A-2' will open nmlkj

3. the motor will not start nmlkj

4. the start button will jam in the closed position nmlkj

1. temperature will drop nmlkj

2. will probably burn out immediately nmlkj

3. will continue to operate nmlkj

4. will operate on reduced current nmlkj

1. quartered nmlkj

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63.In a simple series circuit, the entire source voltage will drop across

64.In a three-phase circuit, the phase voltages are

65.In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments?

66.In the flow of one cycle of single phase AC current past any given point in a circuit, the maximum current peak occurs

2. unchanged nmlkj

3. doubled nmlkj

4. quadrupled nmlkj

1. the resistor next to the negative terminal nmlkj

2. a short circuit nmlkj

3. the resistor next to the positive terminal nmlkj

4. an open circuit nmlkj

1. 120° apart nmlkj




1. DC voltmeter nmlkj

2. DC ammeter nmlkj

3. frequency meter nmlkj

4. power factor meter nmlkj

1. one time nmlkj

2. two times nmlkj

3. three times nmlkj

4. four times nmlkj

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67.In the illustration EL-0033 the component C is the

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68.Large cable sizes are formed as individual conductors that may be comprised of several smaller strands to

69.Magnet chatter or 'pumping' occurring in a magnetic contactor can be caused by

1. fixed contact nmlkj

2. moving contact nmlkj

3. connection terminal nmlkj

4. trip bar nmlkj

1. obtain the flexibility required for easy handling nmlkj

2. reduce the overall weight of the wire run nmlkj

3. reduce the number of supports needed for a horizontal overhead run nmlkj


1. dirt or grease on pole faces nmlkj

2. mechanical interference in the contacts nmlkj

3. chattering contacts on the control relay nmlkj

4. magnetic lock out of the contacts nmlkj

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70.Most conducting materials such as copper, aluminum, iron, nickel, and tungsten

71.Periodic testing of circuit breakers is necessary to assure that a correctly rated and properly installed unit

72.Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?

73.Reversing the current flow through a coil will

74.The 24 volt DC bus on the emergency switchboard is used to supply power to the

1. increase in resistance with increased temperature nmlkj

2. increase in resistance with decreased temperature nmlkj

3. decrease in resistance with increased temperature nmlkj

4. increase in conductance with increased temperature nmlkj

1. can trip faster as it increases in age nmlkj

2. will continue to provide the original degree of protection nmlkj

3. does not exceed its interrupting capacity nmlkj

4. be able to withstand at least 125% of applied voltage nmlkj

1. Current and voltage may be in phase. nmlkj

2. Current may lead the voltage. nmlkj

3. Current may lag the voltage. nmlkj

4. All of the above. nmlkj

1. reduce the amount of flux produced nmlkj

2. have no effect on the eddy currents produced nmlkj

3. reduce the power consumed nmlkj

4. reverse its two-pole field nmlkj

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75.The basic measuring unit of inductance is the

76.The combined effect of inductive reactance, capacitive reactance, and resistance in an AC series circuit is known as

77.The 'dielectric constant' is a numerical value indicating the effectiveness of a dielectric material in comparison to that of a standard, which is

78.The electrical device shown in the illustration EL-0077 is a/an

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1. general alarm system nmlkj

2. gyrocompass power failure alarm system nmlkj

3. smoke detection system nmlkj


1. coulomb nmlkj

2. ohm nmlkj

3. farad nmlkj

4. henry nmlkj

1. reactance nmlkj

2. total reactance nmlkj

3. impedance nmlkj

4. resonance nmlkj

1. paper or cloth nmlkj

2. glass or mica nmlkj

3. plastic or Teflon nmlkj

4. dry air or a vacuum nmlkj

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79.The electrical diagram shown in the illustration EL-0021 shows

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1. operating coil nmlkj

2. indicating lamp nmlkj

3. motor armature nmlkj

4. potentiometer nmlkj

1. 'R1', 'R2', and 'R3' are connected is series nmlkj

2. 'R1', 'R2', and 'R3' are connected in parallel nmlkj

3. the voltages measured across 'R1', 'R2' and 'R3' will be different if 'R1', 'R2' and 'R3' have different values

nmlkj

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80.The electrical diagram shown in the illustration is used to depict a/an

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81.The electrical schematic illustrated in figure A, EL0059, depicts a/an

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4. the total resistance equals R1 + R2 + R3 nmlkj

1. resistance circuit nmlkj

2. inductive circuit nmlkj

3. stepdown circuit nmlkj

4. capacitive circuit nmlkj

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82.The existing resistance of a conductor is dependent upon its length, cross-sectional area,

83.The final step in testing a circuit for a ground involves the use of a megohmmeter A grounded switch or cable will be indicated by a megohmmeter reading of

84.The illustrated circuit (EL-0024) is a

1. autotransformer nmlkj

2. Delta Wye transformer nmlkj

3. primary EMF generator nmlkj

4. potential transformer nmlkj

1. temperature and insulation nmlkj

2. material and insulation nmlkj

3. resistive coefficient and material nmlkj

4. material and temperature nmlkj

1. 'zero' nmlkj

2. infinity nmlkj

3. steady in the high range nmlkj

4. unsteady in the low range nmlkj

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85.The illustrated device is a

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1. megohm meter nmlkj

2. Gauss meter nmlkj

3. wheatstone bridge nmlkj

4. germanium diode tester nmlkj

1. full wave bridge rectifier nmlkj

2. half wave bridge rectifier nmlkj

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86.The insulation resistance of electric equipment and machinery should be tested for the lowest normal insulation values

87.The multiple prefix 'giga' (G) means

88.The multiple prefix 'kilo' means

89.The multiple prefix 'mega' (M) means

90.The need for insulation cleaning may be determined by

3. solid state voltage regulator nmlkj

4. direct current (DC) filter nmlkj

1. immediately after shutting down the machine nmlkj

2. every time the brush rigging is adjusted nmlkj

3. immediately after starting up the machine nmlkj

4. every 30 days whether the machine is in use or not nmlkj

1. thousand (10 to the 3rd power) nmlkj

2. million (10 to the 6th power) nmlkj

3. billion (10 to the 9th power) nmlkj

4. trillion (10 to the 12th power) nmlkj




4. trillion (10 to the 12 power) nmlkj




4. trillion (10 to the 12th power) nmlkj

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91.The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the

92.The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the

93.The purpose of a main switchboard circuit breaker's reverse-power trip is to

94.The purpose of a short circuit forcing module (short time trip) installed in a branch line is to provide

1. visual inspection for dirt accumulation nmlkj

2. high megger readings nmlkj

3. low operating temperature nmlkj

4. the time period since the last cleaning nmlkj

1. prime mover speed nmlkj

2. exciter output voltage nmlkj

3. load on the alternator nmlkj

4. number of poles nmlkj

1. bridge control panel nmlkj

2. disconnect links nmlkj

3. governor relay box nmlkj

4. main switchboard nmlkj

1. prevent main circuit overload nmlkj

2. protect the circuit breaker blowout coil nmlkj

3. prevent alternator motorization nmlkj

4. prevent low voltage tripout nmlkj

1. high speed clearance of low impedance short circuits in the branch nmlkj

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95.The purpose of the automatic bus transfer shown in the illustration is to

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96.The resistance of a conductor varies

97.The resistance of electric wire will decrease as its

2. continuity of service on main bus under short circuit conditions in a branch

nmlkj

3. isolation of short circuits by selective tripping of branch circuit breakers nmlkj


1. stepdown voltage to the lighting distribution panel nmlkj

2. provide emergency power to the lighting distribution panel nmlkj

3. energize the emergency switchboard from the main switchboard nmlkj

4. provide overcurrent protection to the lighting distribution panel nmlkj

1. directly as its length and inversely as its cross-sectional area nmlkj

2. inversely as its length and directly as its cross-sectional area nmlkj

3. directly as its length and directly as its cross-sectional area nmlkj

4. inversely as its length and inversely as its cross-sectional area nmlkj

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98.The sub-multiple prefix 'micro' (Greek letter 'mu') means

99.The sub-multiple prefix 'milli' (m) means

100.The sub-multiple prefix 'nano' (n) means

101.The sub-multiple prefix 'pico' (p) means

1. length increases nmlkj

2. cross-sectional area increases nmlkj

3. temperature increases nmlkj

4. percent of metallic purities increases nmlkj

1. thousandth (10 to the -3rd power) nmlkj

2. millionth (10 to the -6th power) nmlkj

3. billionth (10 to the -9th power) nmlkj

4. trillionth (10 to the -12th power) nmlkj

1. one thousandth (10 to the -3rd power) nmlkj

2. one millionth (10 to the -6th power) nmlkj

3. one billionth (10 to the -9th power) nmlkj

4. one trillionth (10 to the -12th power) nmlkj









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102.The symbol shown as figure "A" EL-0059 represents a/an

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103.The total power consumed in a parallel circuit is

104.The total power used up in a series circuit is

1. transformer nmlkj

2. coil nmlkj

3. shunt field nmlkj

4. inductor nmlkj

1. the sum of the powers used in each load (resistor) divided by the number of loads

nmlkj

2. always less than the power used in the smallest load nmlkj

3. the sum of the powers used in each individual load nmlkj

4. never more than the power used in the largest load nmlkj

1. the sum of the powers used in each load (resistor) divided by the number of loads

nmlkj

2. the sum of the powers used in each load nmlkj

3. always less than the power used in the smallest load nmlkj

4. never more than the power used in largest load nmlkj

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105.The total resistance of a parallel circuit is always

106.The total voltage of a series circuit is the

107.The unit 'hertz' is equivalent to

108.The unit of electrical resistance is the

109.To carry out an insulation resistance test, one terminal of the megohmmeter should be connected to the winding, with the other terminal being connected to the

1. larger than that of the branch with the greatest resistance nmlkj

2. smaller than that of the branch with the lowest resistance nmlkj

3. equal to the sum of the individual branch resistances nmlkj

4. equal to the sum of the individual branch resistances divided by the number of branches

nmlkj

1. sum of the individual voltage drops nmlkj

2. total resistance divided by the total current nmlkj

3. sum of the individual currents multiplied by the number of resistors nmlkj

4. total current divided by the total resistance nmlkj

1. coulombs per second nmlkj

2. revolutions per second nmlkj

3. revolutions per minute nmlkj

4. cycles per second nmlkj

1. ampere nmlkj

2. volt nmlkj

3. watt nmlkj

4. ohm nmlkj

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110.To check the three line fuses of a three-phase system consisting of a three-phase motor, you must

111.To determine if a stator coil is grounded, you should use a/an

112.To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them

113.To test fuses in an energized circuit, you should use a

1. power supply nmlkj

2. variable resistor nmlkj

3. frame of the machine nmlkj

4. armature nmlkj

1. place the starter in the 'stop' position nmlkj

2. make sure the motor is operating at full load to guard against a false reading

nmlkj

3. place the leads across the 'hot' ends of the fuses nmlkj

4. place the leads across the bottom ends of the fuses nmlkj

1. ammeter nmlkj

2. ground detection lamp nmlkj

3. magneto nmlkj

4. megger nmlkj

1. parallel and as close as possible to each other nmlkj

2. at right angles and as close as possible to each other nmlkj

3. parallel to and as far as practicable from each other nmlkj

4. at right angles and as far as practicable from each other nmlkj

1. low voltage light bulb nmlkj

2. megohmmeter nmlkj

3. voltmeter nmlkj

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114.What is represented by the electric symbol figure "D" in the illustration?

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115.What is the direction of current through the load resistor in the circuit shown in the illustration?

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4. resistance meter nmlkj

1. Fuse nmlkj

2. Plug-in contact resistor nmlkj

3. Variable capacitor nmlkj

4. Electrolytic capacitor nmlkj

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116.What is the power consumed by 'R2' in the circuit illustrated, if the supply is 24 volts and the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? (EL-0020)

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1. Always from point "Z" to the grounded end. nmlkj

2. Always from the grounded end to point "Z". nmlkj

3. It depends on the instantaneous polarity at point "W". nmlkj

4. It cannot be determined without a directional ammeter. nmlkj

1. 16 watts nmlkj

2. 20 watts nmlkj

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117.What is the power consumed by 'R3' in the circuit illustrated if the supply is 24 volts and resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? (EL-0020)

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118.When a megohmmeter is being used to test insulation resistance, current leakage along the surface of the insulation is indicated by the megohmmeter's pointer

119.When a megohmmeter is used to test insulation, the gradual rise of

3. 24 watts nmlkj

4. 28 watts nmlkj

1. 12 watts nmlkj

2. 20 watts nmlkj

3. 24 watts nmlkj

4. 48 watts nmlkj

1. dipping toward zero then raising slowly nmlkj

2. continually rising as test voltage is applied nmlkj

3. kicking slightly down scale as voltage is applied nmlkj

4. fluctuating around a constant resistance reading nmlkj

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the pointer reading as a result of continued cranking, is caused by

120.When a megohmmeter is used to test the dielectric strength of wire insulation, the initial dip of the pointer toward 'zero' is caused by

121.When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to

122.When changing fuses, you should always

123.When electrical cables penetrate watertight bulkheads,

1. good conductor resistance nmlkj

2. the leakage of current along the surface of dirty insulation nmlkj

3. the inductive reactance of the windings nmlkj

4. the dielectric-absorption effect of the insulation nmlkj

1. good insulation nmlkj

2. the leakage of current along the surface of dirty insulation nmlkj

3. the capacitance of the circuit nmlkj

4. the dielectric absorption effect of the insulation nmlkj

1. prevent vibration damage to delicate components nmlkj

2. prevent mechanical damage to solid-state components nmlkj

3. dissipate stray magnetic currents nmlkj

4. act as a heat sink nmlkj

1. wear rubber boots nmlkj

2. use a fuse puller nmlkj

3. stand on a rubber mat nmlkj

4. wear safety glasses nmlkj

1. they should be grounded on either side of the bulkhead nmlkj

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124.When insulation failure produces a low resistance current path between two conductors, the resulting condition is known as

125.When maintenance personnel are working on electrical equipment, all supply switches should be secured in the open position and tagged specifically by the

126.When measuring AC current flow, you must always connect the meter

127.When placed in a magnetic field, which of the materials listed will maintain the highest permeability?

2. they must be bent to a radius of six diameters nmlkj

3. a watertight stuffing tube capable of accepting packing should be employed

nmlkj

4. they should be secured by a clamp nmlkj

1. an open nmlkj


3. a ground nmlkj

4. a surge nmlkj

1. watch engineer nmlkj

2. chief engineer or first assistant nmlkj

3. chief electrician nmlkj

4. person performing the repair nmlkj

1. in series with the power source and load nmlkj

2. in parallel with the power source and load nmlkj

3. insuring correct polarity nmlkj

4. using the lowest range possible to prevent instrument damage nmlkj

1. Glass nmlkj

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128.When replacing fuses, always make sure

129.When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to

130.When the current flow through a copper wire increases, its

131.When using a megohmmeter to test insulation, good insulation will be indicated by

2. Bakelite nmlkj

3. Soft iron nmlkj

4. Aluminum nmlkj

1. to stand on a rubber mat and use rubber gloves nmlkj

2. to use insulated pliers or screwdriver nmlkj

3. the fuse clips are straight, tight, and in good contact nmlkj

4. to increase the fuse rating 10% to guard against 'nuisance blowing' nmlkj

1. increase, causing a drop in the line current nmlkj

2. increase, causing a decrease in the line voltage nmlkj

3. decrease, causing an increase in the line voltage nmlkj

4. decrease, causing an increase in the line current nmlkj

1. resistance will decrease nmlkj

2. insulation will burn nmlkj

3. temperature will increase nmlkj

4. conductivity will increase nmlkj

1. slight kicks of the needle down scale nmlkj

2. a downward dip followed by a gradual climb to the true resistance value nmlkj

3. a gradual rise in the pointer reading at the outset nmlkj

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132.Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used This element consists of a

133.Which component will stop the motor shown in the illustration in case of an overload in the control circuit?

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134.Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

4. the initial dip of the pointer nmlkj

1. cylindrical spring on the contact arm nmlkj

2. conical spring on the contact arm nmlkj

3. second bimetal element nmlkj

4. second electromagnet nmlkj

1. "E" nmlkj

2. "G" nmlkj

3. "H" nmlkj

4. "I" nmlkj

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135.Which of the following conditions can lead to the failure of a resistor?

136.Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?

137.Which of the following materials is a good electrical insulator?

138.Which of the following precautions should be taken when a blown fuse, rated at 10 amperes, is replaced?

1. voltage rating nmlkj

2. weight per unit length nmlkj

3. current rating nmlkj

4. inductance per unit length nmlkj

1. Excessive vibration nmlkj

2. Insufficient ventilation nmlkj

3. Corrosion nmlkj

4. All of the above nmlkj

1. Sealed motors nmlkj

2. Drip proof motors nmlkj

3. Enclosed motors nmlkj

4. Watertight motors nmlkj

1. wood nmlkj

2. silver nmlkj

3. copper nmlkj

4. gold nmlkj

1. Short out the fuse before removing it from the circuit. nmlkj

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139.Which of the following represents a characteristic of an ungrounded electrical distribution system?

140.Which of the following statements concerning electrical cables is correct?

141.Which of the following statements is correct for the illustrated circuit EL-0020?

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2. Use needle-nose pliers to remove fuse from the circuit. nmlkj

3. Replace blown fuse with one of equal voltage and ampere capacity. nmlkj

4. Fuses of 10 ampere rating and less are virtually harmless when energized and may be handled freely.

nmlkj

1. Accidental contact between one line and ground does not cause an outage. nmlkj

2. Double ground faults on different phases will not cause an outage. nmlkj

3. Ground detection systems are unnecessary. nmlkj

4. Accidental contact between one line and ground will always cause an outage.

nmlkj

1. Where they pass through watertight bulkheads, they should be fitted with watertight stuffing boxes.

nmlkj

2. Electric cable coverings should never be grounded. nmlkj

3. Electrical cables must be rigidly held in place by welding of armored cable, or glued in place where nonmetallic insulation is used.

nmlkj


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142.Which of the following statements is true concerning the cleaning of electrical contacts?

143.Which of the following statements is true if a 100 watt lamp and a 75 watt lamp are connected in parallel across a 100 volt power supply?

144.Which of the following statements regarding the use of a current

1. 'R1', 'R2', and 'R3' are connected in series. nmlkj

2. 'R1', 'R2', and 'R3' are connected in parallel. nmlkj

3. The voltages measured across 'R1', 'R2', and 'R3' are equal. nmlkj

4. The total resistance equals 1/R1 + 1/R2 + 1/R3. nmlkj

1. Compressed air should be used to blow out metallic dust. nmlkj

2. Magnetic brushes should be used to remove metallic dust. nmlkj

3. The contact surfaces should be greased to increase contact resistance. nmlkj

4. Delicate parts should be cleaned with a brush and an approved safety solvent.

nmlkj

1. The 75 watt lamp will draw as much current as the 100 watt lamp. nmlkj

2. The 100 watt lamp will have a greater resistance. nmlkj

3. Current flow will be the same across each lamp. nmlkj

4. The 75 watt lamp will have a higher resistance. nmlkj

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measuring instrument is correct?

145.Which of the following statements represents the action of a megohmmeter when testing a small capacitor in good condition?

146.Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component?

147.Which of the instruments listed is used to check insulation resistance?

1. It must be connected in series with the circuit. nmlkj

2. You should always start with the lowest range until a suitable reading is obtained.

nmlkj

3. The indicating needle is deflected from left to right regardless of polarity. nmlkj

4. An external shunt is generally utilized where current is less than 10 amperes.

nmlkj

1. The meter pointer should immediately swing to the maximum resistance value for the capacitor.

nmlkj

2. The meter pointer should first swing quickly to zero and then gradually move up the scale as the capacitor charges.

nmlkj

3. The meter pointer should immediately swing to infinity and then drop in sharp jerks as the voltage increases.

nmlkj

4. The meter pointer should immediately swing to a high reading and gradually decrease.

nmlkj

1. Wear rubber gloves and boots. nmlkj

2. Use only approved nonconducting tools. nmlkj

3. Ground the case of the machine before beginning any repairs. nmlkj

4. Open the supply circuits and tag the switches. nmlkj

1. Magneto nmlkj

2. Megohmmeter nmlkj

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148.Which of the instruments listed should always be connected in series with a circuit?

149.Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?

150.Which of the meters listed should only be used after a circuit has been electrically disconnected?

151.Which of the spaces listed is defined as a 'location requiring an exceptional degree of protection' when considering the installation of shipboard electrical equipment?

3. Dynamometer nmlkj

4. Rheostat nmlkj

1. Ammeter nmlkj


3. Wattmeter nmlkj

4. Voltmeter nmlkj

1. The generator and bus transfer section nmlkj

2. The 450 volt, 60 cycle, 3 phase bus nmlkj

3. The 120 volt, 3 phase, 60 cycle bus nmlkj

4. The 24 volt DC bus nmlkj

1. Wattmeter nmlkj

2. Frequency meter nmlkj

3. Ammeter nmlkj

4. Ohmmeter nmlkj

1. Machinery space nmlkj

2. Chart room nmlkj

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152.Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?

153.With both ends of a three conductor cable disconnected and arranged without the conductors touching each other, an ohmmeter reading of 'zero' ohms between the ends of one conductor would indicate

154.A direct current passing through a wire coiled around a soft iron core is the description of a simple

155.A poorly made electrical connection:

3. Console room nmlkj

4. Accommodation space nmlkj

1. Glass nmlkj

2. Mica nmlkj

3. Bakelite nmlkj

4. Permeable iron nmlkj

1. continuity nmlkj

2. a partial ground nmlkj

3. the resistance is infinite nmlkj


1. magnetic shield nmlkj

2. electromagnet nmlkj

3. piezoelectric device nmlkj

4. electromagnetic domain nmlkj

1. has a much higher-than-normal resistance. nmlkj

2. can produce excessive heat when normal current flows through the circuit.

nmlkj

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156.A switch would be classified as:

157.An electric toaster is rated for 220 V and 10 A Its power rating would be:

158.Electrical conductors:

159.In a basic electrical circuit, the part that stores electric energy or changes it into other forms is:

160.Technician A says that when taking measurements with a

3. can reduce the total energy normally available for the load. nmlkj

4. all of these nmlkj

1. a control device nmlkj

2. a protective device. nmlkj

3. a load device. nmlkj

4. a voltage source. nmlkj

1. 2200 W nmlkj

2. 2200 Wh nmlkj

3. 2200 kWh nmlkj

4. 2200 J nmlkj

1. have high resistance. nmlkj

2. use most of the energy available from the source. nmlkj

3. complete the electron path from the source to the load. nmlkj


1. the load. nmlkj

2. the source. nmlkj

3. the conductor(s). nmlkj

4. the switch. nmlkj

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voltmeter and an ammeter, the meters are both connected into the circuit in the same way Technician B says the voltmeter is connected in series and the ammeter is connected in parallel Who is correct?

161.The force that causes the flow of electrons through a conductor is known as:

162.The method used to produce electron emission in most vacuum tubes is known as

163.The unit of measurement for the difference of potential between two points is:

164.When troubleshooting electronic equipment, you should use a high

1. Technician A only nmlkj

2. Technician B only nmlkj

3. both Technician A and Technician B nmlkj

4. neither Technician A nor Technician B nmlkj

1. the power. nmlkj

2. the current. nmlkj

3. the voltage. nmlkj

4. the resistance nmlkj

1. photoelectric emission nmlkj

2. secondary electric emission nmlkj

3. cold cathodic electric emission nmlkj

4. thermionic emission nmlkj

1. the volt nmlkj

2. the ampere. nmlkj

3. the PD. nmlkj

4. the ohm nmlkj

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impedance multimeter

165.Which of the following is an example of a load?

166.Which of the following is an example of a voltage source?

167.Which of the following is classified as a protective device?

168.Which of the following statements concerning analog and digital devices are correct?

1. to prevent excess current flow through the meter that would damage it nmlkj

2. for AC measurements only and a low resistance meter for DC measurements

nmlkj

3. whenever a low impedance meter is not available, regardless of the components being tested

nmlkj

4. so as not to load down the circuit and obtain erroneous voltage readings nmlkj

1. an electrical wall outlet nmlkj

2. a hair dryer nmlkj

3. a pushbutton nmlkj

4. an extension cord nmlkj

1. a battery nmlkj

2. a light bulb nmlkj

3. a switch nmlkj

4. copper wire conductors nmlkj

1. a pushbutton nmlkj

2. a fuse nmlkj

3. a circuit breaker nmlkj

4. both b and c nmlkj

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169.Which of the listed devices is used to measure pressure and convert it to an electrical signal?

170.A battery is connected to a circuit containing three resistors in parallel The values of the three resistors are 2 ohms, 3 ohms, and 6 ohms What is the voltage of the battery if the total circuit current is 12 amps?

171.A breakable, mercury-filled thermometer should not be used in a lead-acid battery to measure electrolyte temperature, as an accidental breakage can cause

172.A constant output voltage from an AC generator is maintained by the

1. The variables in digital systems are fixed quantities, and the variables in analog systems are continuous quantities.

nmlkj

2. There are no basic differences between the two systems. nmlkj

3. Analog devices are superior in accuracy compared to digital devices. nmlkj

4. Operations in a digital device are performed simultaneously. nmlkj

1. Transducer nmlkj

2. Reducer nmlkj

3. Transformer nmlkj

4. Rectifier nmlkj

1. 2 volts nmlkj

2. 6 volts nmlkj

3. 12 volts nmlkj

4. 24 volt nmlkj

1. severe sparking and explosions nmlkj

2. rapid oxidation of battery plates nmlkj

3. violent gassing at the positive plates nmlkj

4. corrosion on the battery terminals nmlkj

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173.A DC ammeter is always connected

174.A diesel driven emergency generator is prevented from being paralleled with the ship's service generators by

175.A generator has been exposed to water and is being checked for its safe operation Therefore, it is necessary to

176.A generator is prevented from becoming motorized by the use of a/an

1. prime mover governor nmlkj

2. exciter generator nmlkj

3. voltage regulator nmlkj

4. reverse power relay nmlkj

1. in series with a circuit nmlkj

2. in parallel with a circuit nmlkj

3. with internal shunts only nmlkj

4. without regard to polarity nmlkj

1. an electrical interlock system nmlkj

2. an automatic paralleling trip switch nmlkj

3. the synchronizing oscilloscope nmlkj

4. the reverse current relay nmlkj

1. check for shorted coils with a growler nmlkj

2. take moisture readings with a hydrometer nmlkj

3. test insulation values with a megger nmlkj

4. ground the commutator, or slip rings and run it at half load for 12 hours nmlkj

1. overspeed trip nmlkj


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177.A hydrometer indicates specific gravity by comparing the

178.A lead-acid battery cell sustaining a short circuit

179.A lead-acid battery is considered fully charged when the

180.A lead-acid battery may become hotter than normal during a charge if the

3. back pressure trip nmlkj

4. governor controls nmlkj

1. density of a substance in water with the density of the same substance in air

nmlkj

2. differences in weight between water and the liquid measured nmlkj

3. mass of substance measured with the density of the same substance nmlkj

4. buoyancy of an object in water with the buoyancy of the same object in the liquid being measured

nmlkj

1. will be indicated by lime accumulation on the terminal posts nmlkj

2. will have unusually high cell voltage nmlkj

3. will become excessively heated while being charged nmlkj

4. cannot be completely discharged under load nmlkj

1. electrolyte gasses freely nmlkj

2. battery charger ammeter indicates a positive reading nmlkj

3. terminal voltage reaches a constant value at a given temperature nmlkj

4. specific gravity of all cells reaches the correct value and no longer increases over a period of 1 to 4 hours

nmlkj

1. battery has a shorted cell nmlkj

2. charging voltage is too low nmlkj

3. specific gravity is too high nmlkj

4. battery room door is secured nmlkj

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181.A loss of field excitation to an AC generator while operating in parallel will cause it to

182.A nickel-cadmium battery is receiving a normal charge and gases freely The charging current should

183.A positive charge can:

184.A reverse-current relay will prevent AC generator motorization by

185.A slow continual loss of electrolyte level from one cell of a storage battery could be due to

1. absorb more and more load due to decreased armature reaction nmlkj

2. lose its load due to the inherent speed droop built into the governor nmlkj

3. smoke and overload due to field flashover as residual field flux changes polarity

nmlkj

4. lose its load, begin to motorize, trip out on reverse power relay, and possibly overspeed

nmlkj

1. be increased nmlkj

2. be decreased nmlkj

3. be cut off and the battery allowed to cool nmlkj

4. remain the same nmlkj

1. attract a negatively charged object nmlkj

2. attract and then repel a neutral object nmlkj

3. neither of the above nmlkj

4. both of the above nmlkj

1. automatically redirecting the load nmlkj

2. automatically speeding up the prime mover nmlkj

3. tripping the panel board main switch nmlkj

4. tripping the generator circuit breaker nmlkj

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186.A three-phase alternator operates at 450 volts with a 08 power factor If the ammeter indicates 250 amperes, what should be the KW meter reading?

187.A transformer in an electric circuit serves to

188.A twelve volt lead-acid battery is constructed of

189.A vessel is equipped with two ship's service generators Generator #1 is rated at 900 kw and generator #2 is rated at 600 kw During parallel operation, with a hotel load of 1,000 kw, what should be the kw load on generator #2?

1. a cracked casing nmlkj

2. too low a charging rate nmlkj

3. the specific gravity being higher than normal nmlkj

4. one filler cap installed too tightly nmlkj

1. 90.00 KW nmlkj

2. 127.27 KW nmlkj

3. 155.70 KW nmlkj

4. 194.85 KW nmlkj

1. generate its own electrical power nmlkj

2. transform electrical energy into mechanical energy nmlkj

3. increase or decrease circuit voltage as required nmlkj

4. convert AC current to DC current nmlkj

1. one cell nmlkj

2. three cells nmlkj

3. six cells nmlkj

4. twelve cells nmlkj

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190.After closing the circuit breaker to place two similar alternators in parallel, the NEXT step is to balance the

191.Air gap readings for electrical generating equipment should be taken periodicly This is to: I = determine the condition of the bearings; II =prevent damage to the rotor and stator.

192.Air gap readings should be periodicly taken for electrical generation equipment The best tool to use to take these measurements is a

193.Air gap readings should be taken on electrical generation machinery periodicly to: I = determine the need for cleaning; II =check the condition of the bearings.

1. 100 kw nmlkj

2. 400 kw nmlkj

3. 500 kw nmlkj

4. 600 kw nmlkj

1. power factor nmlkj

2. voltage load nmlkj

3. kilowatt load nmlkj

4. ampere load nmlkj

1. I only nmlkj

2. II only nmlkj

3. both I and II nmlkj

4. neither I or II nmlkj

1. cloth (non-metalic) tape measure nmlkj

2. dial indicator nmlkj

3. inside micrometer nmlkj

4. tapered, long blade, feeler gage nmlkj

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194.Air gap readings should be taken periodicly on electrical generation equipment to

195.An AC generator panel is fitted with both synchronizing lamps and a synchroscope When the synchroscope pointer reaches the noon position, one synchronizing light is bright and the other is dark This means

196.An AC generator produces 60 Hz at 1800 RPM If the generator speed is increased to 1830 RPM, the cycles will

197.An alternator switchboard has a synchroscope and synchronizing

1. I only nmlkj

2. II only nmlkj



1. determine the amount of varnish that can be applied to correct insulation problems

nmlkj

2. determine the condition of the bearings nmlkj

3. provide for the correct proper tightening of the field coil bolts and correct lateral adjustment of the field coils

nmlkj

4. increase machine efficiency nmlkj

1. there is a ground on the phase with the dark lamp nmlkj

2. the phase sequence is incorrect nmlkj

3. the phase sequence is correct nmlkj

4. the generator breaker may be closed nmlkj

1. remain at 60 Hz nmlkj

2. increase to 61 Hz nmlkj

3. decrease to 59 Hz nmlkj

4. increase to 63 Hz nmlkj

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lamps If the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus?

198.As a result of a mechanical malfunction in one of the ship's service generators operating in parallel, you must secure that generator In order to prevent a possible overload to the remaining generator, which of the following sequential courses of actio

199.As shown in the illustration EL-0071, the dry-cell batteries are connected in

Maximizeaza

1. The breaker should be closed when one synchronizing lamp is dark and the other is bright.

nmlkj

2. The breaker should be closed when both synchronizing lamps are bright. nmlkj

3. The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus.

nmlkj

4. A portable phase sequence indicator must be used to verify the information from the lamps.

nmlkj

1. Trip the malfunctioning generator's circuit breaker and prime mover throttle trip.

nmlkj

2. Trip all nonvital distribution feeder circuit breakers, the malfunctioning generator's circuit breaker, and the prime mover throttle trip.

nmlkj

3. Trip the malfunctioning generator's circuit breaker and distribution feeder circuit breakers.

nmlkj

4. Trip all nonvital distribution feeder circuit breakers, the malfunctioning prime mover turbine throttle trip, and the generator circuit breaker.

nmlkj

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200.As shown in the illustration, all 'MS' contacts are opened and closed by means of

Maximizeaza

1. compound nmlkj

2. series nmlkj

3. parallel nmlkj

4. tandem nmlkj

1. operating coils nmlkj

2. magnets nmlkj

3. manual operation of the master switches nmlkj

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201.At high discharge rates, nickel-cadmium storage batteries are superior to lead-acid batteries because they

202.Attempting to parallel an AC generator which is out of phase with the bus will result in which of the following problems?

203.Automatic voltage regulators provided on switchboards function to

204.Batteries used for diesel engine starting should

205.Battery capacities are given in

4. solenoid switches nmlkj

1. require fewer cells for the same voltage and less mounting space nmlkj

2. are able to produce higher voltages and do not have to be charged as often nmlkj

3. can be charged and discharged many times without much damage nmlkj

4. have no individual cells to replace at the end of useful life nmlkj

1. The breaker should trip. nmlkj

2. The KVA will decrease. nmlkj

3. The synchronizing lamps will burn out. nmlkj

4. The power factor will be unitized. nmlkj

1. regulate the AC load on the generator nmlkj

2. protect the switchboard from high voltage nmlkj

3. govern prime mover speed to control voltage nmlkj

4. vary the field excitation to the generators nmlkj

1. be located in a locker on the weather deck nmlkj

2. be located as close as possible to the engine nmlkj

3. have sufficient capacity to provide at least 50 starts consecutively without recharging

nmlkj

4. only be of the nickel alkaline type nmlkj

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206.Battery charging rooms should be well ventilated because the charging process produces

207.Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?

208.Before reassembling any machinery, you should

209.Caution must be exercised during the charging of lead-acid storage batteries as

1. volts nmlkj

2. volt-amperes nmlkj

3. volt-hours nmlkj

4. ampere-hours nmlkj

1. highly poisonous gas nmlkj

2. highly combustible oxygen nmlkj

3. explosive gases nmlkj

4. corrosive gases nmlkj

1. De-energize the applicable switchboard bus. nmlkj

2. Bypass the interlocks. nmlkj

3. Secure and tag the supply circuit breaker in the open position. nmlkj

4. Station a man at the circuit supply switch. nmlkj

1. replace all bearings regardless of length of service nmlkj

2. apply a heavy coat of oil to all mating surfaces nmlkj

3. clean any corroded surfaces and file all burrs smooth nmlkj

4. coat all parts with alemite grease nmlkj

1. the acid will become weaker nmlkj

2. hydrogen gas is being continuously liberated nmlkj

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210.Common nickel-cadmium and nickel-iron storage batteries utilize

211.During discharge of a lead-acid storage battery, which of the following actions occurs?

212.During the charging process of storage batteries, the charging rooms should be well ventilated because

213.Electric circuits are protected against overloads and short circuits by means of a/an

3. both plates are changing chemically to lead sulfate nmlkj

4. lead peroxide in the negative plate is poisonous nmlkj

1. acid primary cells nmlkj

2. alkaline primary cells nmlkj

3. acid secondary cells nmlkj

4. alkaline secondary cells nmlkj

1. The acid becomes stronger. nmlkj

2. Both plates change chemically to ammonium chloride. nmlkj

3. The acid becomes weaker. nmlkj

4. Hydrogen gas is liberated. nmlkj

1. without ventilation excessive gassing will occur nmlkj

2. highly poisonous gases are released nmlkj

3. highly explosive gases will otherwise accumulate nmlkj

4. without ventilation the battery will not take a full charge nmlkj


2. amplifier nmlkj

3. diode nmlkj

4. capacitor nmlkj

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214.Electric current is the flow of electrons through a conductor; the rate of this flow is measured in

215.Equal power factors on paralleled AC generators are maintained by an automatic

216.Equalization of the power factors of two alternators operating in parallel is accomplished

217.From the standpoint of safety, you should never allow salt water to enter a lead-acid storage battery or come in contact with sulfuric acid because

218.If a 6 volt battery were connected in series with a 24 volt battery by

1. volts nmlkj

2. amperes nmlkj

3. coulombs nmlkj

4. ohms nmlkj



3. reverse current relay nmlkj

4. governor control switch nmlkj

1. manually, by adjusting the governor controls nmlkj

2. automatically, by automatic voltage regulators nmlkj

3. manually, adjusting the output of current transformers nmlkj

4. automatically, by the designed action of the governors nmlkj

1. the resulting gas is extremely flammable nmlkj

2. the resulting gas is a respiratory irritant that can be fatal nmlkj

3. the primary constituent, sodium, reacts lethally with lead peroxide nmlkj

4. combining salt water with lead-acid creates an invisible gas resulting in severe corrosion

nmlkj

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putting their negative terminals together, what would be the result?

219.If a fuse of correct size and type blows frequently,

220.If a transformer is connected to a DC source, the transformer will overload at the

221.If air gap readings for an electical generating machine have changed significantly from the last reading, you should check

222.If an alternator is to be inactive for a considerable period of time, which of the following actions should be taken?

1. 'Zero' volts nmlkj

2. 12 volts of the opposite polarity nmlkj

3. 18 volts, positive on the 24 volt battery nmlkj

4. 30 volts, negative on the 24 volt battery nmlkj

1. try the next higher amperage rating nmlkj

2. try the next lower amperage rating nmlkj

3. look for trouble within the circuit nmlkj

4. reduce the applied voltage 10% nmlkj

1. contacts nmlkj

2. primary coil nmlkj

3. secondary coil nmlkj

4. core nmlkj

1. the bearings nmlkj

2. insulation readings and machine cleanliness nmlkj

3. the prime mover thrust bearing nmlkj

4. the field coil bolts for the proper torque values nmlkj

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223.If the energy input is significantly reduced to the prime mover of one shipboard alternator operating in parallel with others, that alternator will

224.If the excitation is increased to one of two alternators operating in parallel, the

225.If the excitation of an alternator operating in parallel is decreased below normal, its

226.If the pointer of the synchroscope is rotating in the slow direction when you are preparing to parallel two alternators, the

1. It should be disconnected from the prime mover and raised off its bearing supports.

nmlkj

2. Insulation resistance readings should be taken weekly to ensure resistance is not deteriorating.

nmlkj

3. The brushes should be lifted off the slip rings to prevent pitting of the metal by electrolytic action.

nmlkj

4. The windings and collector rings should be protected with a thin coat of grease or oil.

nmlkj

1. continue to operate at no load nmlkj

2. lose its load and overspeed nmlkj

3. begin to motorize and then trip out nmlkj

4. slow down and operate at reduced load nmlkj

1. power factor will change in the lagging direction nmlkj

2. power factor will change in the leading direction nmlkj

3. kilowatt load will be greatly increased nmlkj

4. ampere load will be greatly decreased nmlkj

1. power factor will change in the lagging direction nmlkj

2. power factor will change in the leading direction nmlkj

3. ampere load will be greatly increased nmlkj

4. kilowatt load will be greatly decreased nmlkj

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227.If three AC generators are operating in parallel, and one of them were to "pull out" of synchronism with the other two generators, the

228.If two AC generators have just been placed in parallel, the true power load is initially distributed evenly by

229.If violent gassing occurs when a lead-acid storage battery is first placed on charge, the

230.In a 60 Hz AC system, the current will pass through one complete cycle in

1. incoming machine is turning faster than the load alternator nmlkj

2. loaded alternator is turning faster than the incoming machine nmlkj

3. load on the loaded alternator is ready to split nmlkj

4. incoming machine is beginning to pick up some of the load nmlkj

1. normally operating AC generators will vibrate severely nmlkj

2. AC generator pulling out of synchronism will vibrate severely nmlkj

3. normally operating AC generators will overspeed and unload nmlkj

4. AC generator pulling out of synchronism will become motorized nmlkj

1. a balance coil nmlkj

2. changing field excitation nmlkj

3. adjusting the governor control settings nmlkj

4. a rheostat nmlkj

1. battery must be given an emergency charge nmlkj

2. charging rate is too low nmlkj

3. charging rate is too high nmlkj

4. specific gravity of the electrolyte solution is too low nmlkj

1. 60 seconds nmlkj

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231.In a three-phase, open-delta connected transformer, the line current is equal to

232.In an AC generator, pitting of collector rings will cause: I = sparking; II = chattering.

233.In electric circuit schematics, a transformer is represented by which of the symbols shown in the illustration EL-0059?

Maximizeaza

2. 6 seconds nmlkj

3. 1 second nmlkj

4. .016 of a second nmlkj

1. the phase current nmlkj

2. three times the phase current nmlkj

3. the sum of any two phase currents nmlkj

4. the difference of any two phase currents nmlkj

1. I only nmlkj

2. II only nmlkj



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234.In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves?

235.In the illustration EL-0039 circuit, A, B, C, and D are each 12 volts What is the voltage of the lead connected to C and D with respect to the lead connected to A and B?

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1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

1. The secondary leads must be grounded for 10 minutes to remove static charges.

nmlkj

2. The transformer connections must be made as before with regard to the indicated polarity.

nmlkj

3. The iron core of the transformer must be flashed to pre-magnetize it. nmlkj

4. The iron core must be grounded for 10 minutes to remove any residual magnetism.

nmlkj

1. (+) 48 volts nmlkj

2. (-) 24 volts nmlkj

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236.In the illustration, "D" is the symbol for a/an

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237.In which section of the 24 VDC power supply circuit illustrated, does the greatest change in voltage level take place when fed from ships power

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3. (-) 48 volts nmlkj

4. (+) 24 volts nmlkj

1. thermal overload heater nmlkj

2. portable cable nmlkj

3. fuse nmlkj

4. indicating lamp nmlkj

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238.Kilowatt load is divided between two AC generators operating in parallel by

239.Local action in a dry-cell, or lead-acid storage battery is the process whereby

240.Local action in a nickel-cadmium battery is offset by

1. I nmlkj

2. II nmlkj

3. III nmlkj

4. IV nmlkj

1. adjusting the governor controls nmlkj

2. varying the excitation voltage nmlkj

3. increasing both prime mover speeds simultaneously nmlkj

4. decreasing both prime mover speeds simultaneously nmlkj

1. hydrogen gas is liberated nmlkj

2. the electrolyte compensates for overcharging nmlkj

3. potassium hydroxide absorbs carbon dioxide from the air nmlkj

4. the battery becomes discharged without being connected to a load nmlkj

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241.Loss of or weak residual magnetism in an alternator or generator can be corrected for by

242.Maintenance of alkaline batteries should include

243.Mercury filled thermometers should never be used to determine the temperature of the battery electrolyte because accidental breakage of the thermometer can cause

244.Motorization of an alternator is undesirable because

1. separating the positive and negative plates with plastic spacers nmlkj

2. separating the positive and negative plates with resin impregnated spacers nmlkj

3. adding a small amount of lithium hydroxide to the electrolyte nmlkj

4. trickle charging nmlkj

1. running the rotor in the opposite direction for 5 minutes nmlkj

2. allowing the generator to run at 10% of normal speed for 5 minutes nmlkj

3. running the generator at normal speed with the field rheostat fully counterclockwise

nmlkj

4. using a storage battery or battery charger to 'flash' the field nmlkj

1. checking the electrolyte weekly using a hydrometer nmlkj

2. replacing the electrolyte every 5 years nmlkj

3. trickle charging nmlkj

4. replacment when the volts per cell drops below 1.8 VDC nmlkj

1. severe sparking and explosions nmlkj

2. rapid oxidation of battery plates nmlkj

3. contamination of the electrolyte nmlkj

4. corrosion on the battery terminals nmlkj

1. the alternator will be damaged nmlkj

2. it puts an additional load on the bus nmlkj

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245.Nickel-cadmium storage batteries are superior to lead-acid batteries because they

246.On large generators, space heaters are used to

247.On the meter scale illustrated, while using the R X 1 scale, the reading at "E" will be

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3. high voltage pulses are induced in the bus nmlkj


1. put out higher voltages and require no maintenance nmlkj

2. can remain idle and keep a full charge for a long time nmlkj

3. need fewer cells in series and use less mounting space nmlkj


1. keep the machine at ambient tmperature of the machinery space nmlkj

2. maintain rotor and stator winding temperatures above the dew point to prevent the formation of condensation

nmlkj

3. prevent condensation in the lube oil nmlkj

4. prevent electrolysis due to condensation in the bearings nmlkj

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248.One factor that determines the frequency of an alternator is the

249.One horsepower is equal to

250.Power transformers are rated in

251.Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine

1. 2.0 ohms nmlkj

2. 20 ohms nmlkj

3. 200 ohms nmlkj

4. none of the above nmlkj

1. number of turns of wire in the armature coil nmlkj

2. speed of the rotor nmlkj

3. strength of the magnets used nmlkj

4. output voltage nmlkj

1. 500 watts nmlkj

2. 663 watts nmlkj

3. 746 watts nmlkj

4. 1,000 watts nmlkj

1. kilowatts nmlkj

2. ampere-turns nmlkj

3. kilowatt-volts nmlkj

4. kilovoltamperes nmlkj

1. slightly less than the line frequency nmlkj

2. the same as the line frequency nmlkj

3. slightly greater than the line frequency nmlkj

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252.Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the

253.Proper storage battery maintenance includes

254.Proper storage battery maintenance includes

255.Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction These changes in armature reaction are compensated for by the


1. manual position nmlkj

2. bus neutral position nmlkj

3. raise voltage position nmlkj

4. transfer position nmlkj

1. keeping connections tight and casing surfaces clean nmlkj

2. making sure electrolyte level is below the separator plates nmlkj

3. insulating the terminals with naval jelly nmlkj

4. maintaining a high charging rate at all times nmlkj

1. maintaining a high charging rate at all times nmlkj

2. replacing the electrolyte once a year nmlkj

3. insuring electrolyte level is below the separator plates nmlkj

4. applying petroleum jelly to connections to minimize corrosion nmlkj

1. governor speed droop setting nmlkj


3. balance coil nmlkj

4. phase-balance relay nmlkj

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256.Regarding battery charging rooms, ventilation should be provided

257.Routine maintenance of lead acid batteries should include

258.The amount of voltage induced in the windings of an AC generator depends mainly on

259.The apparent power in a purely inductive circuit is also known as

260.The basic operating principle of a transformer is attributed to

1. at the lowest point of the room nmlkj

2. horizontally near the batteries nmlkj

3. at the highest point of the room nmlkj

4. only when charging is in progress nmlkj

1. keeping the terminals clean nmlkj

2. coating cable connections with petroleum jelly nmlkj

3. maintaining a trickle charge nmlkj


1. the number of field poles energized nmlkj

2. the speed at which the stator windings rotate through the magnetic field nmlkj

3. the strength of the magnetic field nmlkj


1. true power nmlkj

2. lead power nmlkj

3. induced power nmlkj

4. reactive power nmlkj

1. electromagnetic induction nmlkj

2. variance of a conductor in a magnetic field nmlkj

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261.The capacity of a storage battery is measured in

262.The charge of a lead-acid battery can be restored by

263.The charge of a lead-acid battery is checked with a/an

264.The charging of lead-acid storage batteries will always result in

265.The cycles per second developed by the alternator aboard your vessel is determined by

3. mutual reaction nmlkj


1. volts nmlkj

2. ampere-hours nmlkj

3. farads nmlkj

4. amps nmlkj

1. passing an alternating electric current through the cell nmlkj

2. passing a direct electric current through the cell nmlkj

3. adding acid to the electrolyte nmlkj


1. manometer nmlkj

2. hydrometer nmlkj

3. voltmeter nmlkj

4. ohmmeter nmlkj

1. dangerous acid burns nmlkj

2. a dangerously explosive gas being liberated nmlkj

3. the danger of lead poisoning nmlkj


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266.The division of kilowatt load between two paralleled alternators is determined by the

267.The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the

268.The division of the reactive KVA load between paralleled AC generators is initiated by the

269.The dry-cell batteries, shown in the illustration EL-0070 are connected in

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1. the speed of the engine driving the alternator nmlkj

2. the resistance applied to the field rheostat nmlkj

3. the synchronous speed of induction nmlkj

4. the adjustments made to the voltage regulator nmlkj

1. amount of field excitation to the leading machine nmlkj

2. load-speed characteristics of the governors nmlkj

3. amount of field excitation to the lagging machine nmlkj

4. number of field poles per alternator nmlkj

1. voltage regulators nmlkj

2. field rheostats nmlkj

3. reverse power relays nmlkj

4. prime mover governors nmlkj

1. prime mover governors nmlkj

2. voltage regulators nmlkj

3. phase balance relay nmlkj

4. proportioner nmlkj

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270.The dry-cell batteries, when connected as shown in the illustration EL-0070, would produce

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1. compound nmlkj

2. series nmlkj

3. parallel nmlkj

4. tandem nmlkj

1. 1.5 volts nmlkj

2. 2.5 volts nmlkj

3. 3.5 volts nmlkj

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271.The electrolyte in a lead-acid storage battery consists of distilled water and

272.The electrolyte used in a nickel-cadmium battery is distilled water and

273.The freezing point of the electrolyte in a fully charged lead-acid battery will be

274.The frequency of an AC generator is adjusted by means of the

275.The frequency of an AC generator is controlled by the

4. 4.5 volts nmlkj

1. hydrogen chloride nmlkj

2. calcium chloride nmlkj

3. sulfuric acid nmlkj

4. muriatic acid nmlkj

1. diluted sulfuric acid nmlkj

2. potassium hydroxide nmlkj

3. lead sulfate nmlkj

4. zinc oxide nmlkj

1. higher than in a discharged battery nmlkj

2. lower than in a discharged battery nmlkj

3. the same as in a discharged battery nmlkj

4. higher than in a discharged battery, but the specific gravity will be less nmlkj

1. main alternator field rheostat nmlkj

2. exciter field rheostat nmlkj

3. prime mover governor control nmlkj

4. equalizing reactor nmlkj

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276.The frequency of an alternator at a given RPM is determined by the

277.The frequency of an alternator is controlled from the main switchboard by adjusting the

278.The frequency output of an operating alternator is controlled by the

279.The governor control switch of an alternator is moved to the 'raise' position This action will

1. rheostat nmlkj

2. governor nmlkj

3. exciter nmlkj

4. capacitor nmlkj


2. number of magnetic poles nmlkj



1. frequency meter nmlkj


3. governor control nmlkj

4. sychroscope switch nmlkj

1. relative speed of the rotor poles nmlkj




1. raise the no-load speed setting of the governor nmlkj

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280.The joule is the base unit of:

281.The kilowatt load can be adjusted on a paralleled generator by using the

282.The KW load is evenly distributed between two alternators just placed in parallel by adjusting

283.The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor

2. raise the percentage of speed droop nmlkj

3. lower the no-load speed setting of the governor nmlkj

4. lower the percentage of speed droop nmlkj

1. energy nmlkj

2. work nmlkj

3. neither of the above nmlkj

4. both of the above nmlkj

1. field rheostat nmlkj

2. governor control nmlkj

3. automatic voltage regulators nmlkj

4. hand tachometer nmlkj

1. a balance coil nmlkj

2. the governor settings nmlkj

3. the field excitation nmlkj

4. a rheostat nmlkj

1. load limit settings nmlkj

2. idle speed settings nmlkj

3. speed limit settings nmlkj

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284.The main purpose of an electric space heater installed in a large AC generator is to

285.The most common type of AC service generator found aboard ship is the stationary

286.The most practical way to control the voltage output of an AC generator is to vary the

287.The number of cells in a 12 volt lead-acid battery is

4. speed droop settings nmlkj

1. keep the lube oil warm for quick starting nmlkj

2. prevent moisture from condensing in the windings when the machine is shutdown

nmlkj

3. prevent the windings from becoming brittle nmlkj

4. prevent acidic pitting of the slip rings nmlkj

1. electromagnetic field, revolving armature type nmlkj

2. electromagnetic field, oscillatory armature type nmlkj

3. armature, oscillatory electromagnet field type nmlkj

4. armature, rotating electromagnetic field type nmlkj

1. number of windings nmlkj

2. speed of the rotating field nmlkj

3. strength of the rotating magnetic field nmlkj

4. power factor of the load nmlkj

1. three cells nmlkj

2. four cells nmlkj

3. six cells nmlkj

4. twelve cells nmlkj

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288.The open-circuit voltage of a fully charged lead-acid battery cell is

289.The opposition to the establishment of magnetic lines of force in a magnetic circuit is called the circuit's

290.The output voltage of a 440 volt, 60 Hz AC generator is controlled by the

291.The output voltage of a three-phase alternator is regulated by the

292.The plates of a NiCd storage battery are made of

1. 1.5 volts nmlkj

2. 1.8 volts nmlkj

3. 2.0 volts nmlkj

4. 2.3 volts nmlkj

1. resistance nmlkj

2. reluctance nmlkj

3. impedance nmlkj

4. inductance nmlkj


2. load on the prime mover nmlkj

3. speed of the prime mover nmlkj

4. exciter output voltage nmlkj

1. AC voltage to the armature nmlkj

2. AC voltage to the field nmlkj

3. DC voltage to the armature nmlkj

4. DC voltage to the field nmlkj

1. potassium hydroxide with a small amount of sulfuric acid nmlkj

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293.The power factor at which a paralleled AC generator operates is usually adjusted by the

294.The power factor of an AC generator operating singularly is determined by the

295.The proper way to mix the electrolyte for a battery is to add

296.The purpose of DC generator brushes is to

2. lead and lead peroxide nmlkj

3. silver oxide and lead sulfate nmlkj

4. combinations of nickel powder and nickel & cadmium salts nmlkj

1. connected load nmlkj


3. field excitation nmlkj

4. generator's rated voltage nmlkj

1. connected load nmlkj


3. field excitation nmlkj

4. generator's rated voltage nmlkj

1. acid to alkaline water nmlkj

2. acid to distilled water nmlkj

3. alkaline water to acid nmlkj

4. distilled water to acid nmlkj

1. neutralize armature reaction nmlkj

2. conduct electric current to an outside circuit nmlkj

3. convert DC current to AC current nmlkj

4. provide excitation to a DC generator nmlkj

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297.The purpose of the commutator and brushes on a DC generator is to

298.The purpose of the reverse power relay, provided on a ship's service alternator panel, is to trip the circuit in the event of

299.The reactive power drawn by a motor from an AC generator is the power which is

300.The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because

1. transfer generated direct current voltage from the armature to the line nmlkj

2. convert the alternating voltage generated within the armature to a direct voltage

nmlkj

3. provide a sliding contact method to excite the field nmlkj

4. reduce sparking between the armature and the carbon brushes nmlkj

1. main circuit overload nmlkj

2. high power transfer nmlkj

3. generator overspeeding nmlkj

4. alternator motorization nmlkj

1. used to establish the magnetic field of the motor nmlkj

2. lost in overcoming friction in the bearings nmlkj

3. strictly converted to heat generated by current flow through the windings nmlkj

4. transmitted directly through the rotor shaft to perform useful work nmlkj

1. the mechanical shock of paint removal lessens the dielectric strength of the insulation

nmlkj

2. the paint dust is composed of abrasive and semi-conducting materials which impair insulation

nmlkj

3. paint dust buildup has a tendency to cause corrosion nmlkj

4. phase windings frequently become isolated from each other due to dust interference at the terminals

nmlkj

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301.The RPM of an AC generator can be measured with a/an

302.The specific gravity of the electrolyte in a lead-acid battery is measured by a

303.The specific gravity of the electrolyte solution in a lead acid battery

304.The standard method of controlling the output voltage of a 440 volt, 60 Hz, AC generator is accomplished by adjusting the

305.The standard procedure for maintaining the charge in an emergency diesel starting battery is to trickle charge the battery

1. ammeter nmlkj

2. voltmeter nmlkj

3. vibrating reed meter nmlkj

4. synchroscope nmlkj

1. gould plate nmlkj

2. titration pipette nmlkj

3. hydrometer nmlkj

4. litmus paper test nmlkj

1. is not effected during charging nmlkj

2. remains the same during discharge nmlkj

3. would read close to 1.830 when discharged nmlkj

4. gives an indication of the state of charge of the battery nmlkj

1. prime mover speed droop nmlkj

2. number of poles nmlkj

3. alternator field excitation nmlkj


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306.The state of charge of a lead acid storage battery is best indicated by the

307.The state of charge of a lead-acid battery is best indicated by the

308.The true power indicated by a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the

309.The voltage developed by an AC generator is controlled by varying the

1. continuously nmlkj

2. at least once each week nmlkj

3. whenever the charge falls to 75% of full charge nmlkj

4. whenever the electrolyte specific gravity falls to 1.250 or lower nmlkj

1. testing of the individual cell voltages nmlkj

2. ampere hour capacity of the battery nmlkj

3. specific gravity of the electrolyte nmlkj

4. total cell voltages nmlkj

1. individual cell voltage nmlkj

2. ampere-hour capacity nmlkj

3. electrolyte specific gravity nmlkj

4. total cell voltage nmlkj

1. power factor of the load nmlkj

2. angle of coil displacement nmlkj

3. inertia of the movable coil nmlkj

4. high resistance from the load nmlkj

1. speed of the prime mover nmlkj

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310.The voltage output of an AC generator is accurately controlled by

311.Three 12 volt, lead-acid, batteries connected in series will develop

312.Three factors responsible for the change in voltage as load is applied to an AC generator are: 1) the drop in resistance in the armature circuit, 2) the change in flux, and 3) the

313.To determine the state of charge of a nickel-cadmium battery, you would use a/an

2. AC excitation to the field nmlkj

3. DC excitation to the field nmlkj

4. DC excitation of the voltage regulator nmlkj

1. changing the sensitivity of the prime mover to large changes in voltage nmlkj

2. varying the reluctance of the air gap nmlkj

3. varying the DC exciter voltage nmlkj

4. shorting out part of the armature windings nmlkj

1. 12 volts nmlkj

2. 24 volts nmlkj

3. 36 volts nmlkj

4. 48 volts nmlkj

1. armature winding speed nmlkj

2. inductance load drop nmlkj

3. coil pitch factor nmlkj

4. armature reactance voltage drop nmlkj

1. voltmeter nmlkj

2. hydrometer nmlkj

3. ammeter nmlkj

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314.To equalize the power factor of two alternators operating in parallel, the

315.To increase the frequency of an operating AC generator, you should

316.To remove an alternator operating in parallel with another unit from the main electrical bus, you must FIRST

317.To test the state of charge of a nickel-cadmium battery, you should use a/an


1. field excitation of both units is adjusted nmlkj

2. governors of both units are adjusted nmlkj

3. phase sequence is altered nmlkj

4. kilowatt load is evenly divided nmlkj

1. increase the field excitation nmlkj

2. decrease the field excitation nmlkj

3. increase the number of magnetic poles nmlkj

4. increase the speed of the prime mover nmlkj

1. adjust the power factor on both units nmlkj

2. set the desired voltage on the outgoing alternator nmlkj

3. open the circuit breaker on the outgoing alternator nmlkj

4. remove the load from the outgoing alternator nmlkj

1. ammeter nmlkj

2. voltmeter nmlkj

3. hydrometer nmlkj


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318.Transformer cores are laminated to reduce

319.Transformers are used onboard ships with AC generators to

320.Two AC generators are operating in parallel and both are equipped with automatic voltage regulators While standing watch, one generator is noted as having a greater lagging kvar In order to equalize the kvars between the generators you should

321.Two AC generators of the same capacity are operating in parallel One with a zero speed droop setting and the other with a 5% speed droop If its capacity is not exceeded, the unit whose governor has the zero speed droop setting will

1. eddy currents nmlkj

2. secondary flux nmlkj

3. leakage flux nmlkj


1. change frequency nmlkj

2. increase power output to modulating frequency controllers nmlkj

3. decrease power output to modulating frequency controllers nmlkj

4. permit higher voltage for electric motor operation and low voltage for lighting circuits

nmlkj

1. increase the speed of the generator with the largest kvar while decreasing the other generator speed

nmlkj

2. decrease the speed of the generator with the largest kvar while increasing the other generator speed

nmlkj

3. increase the voltage of the generator with the largest kvar while decreasing the other generator voltage

nmlkj

4. decrease the voltage of the generator with the largest kvar while increasing the other generator voltage

nmlkj

1. assume the smaller share of the load nmlkj

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322.Under normal conditions, storage batteries used for starting the emergency diesel generator are maintained in a charged state by which of the following methods?

323.Upon failure of the normal power supply, the emergency generator is placed on the line by the

324.Upon failure of the normal power supply, the emergency generator is placed on the line by the

325.Violent gassing developed by a lead-acid battery during charging indicates that the

2. maintain the frequency of the system nmlkj

3. have poor sensitivity characteristics nmlkj

4. have poor power response nmlkj

1. Trickle charging nmlkj

2. Fast charging nmlkj

3. Equalizing charge nmlkj

4. Reverse charging nmlkj

1. main bus tie feeder nmlkj

2. automatic bus transfer device nmlkj

3. line connection feeder nmlkj

4. power failure alarm bus nmlkj

1. bus tie feeder nmlkj

2. automatic bus transfer device nmlkj

3. line connection feeder nmlkj

4. power failure alarm bus nmlkj

1. plate separators are grounded nmlkj

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326.Violent gassing from a lead-acid battery while it is being charged, indicates that the

327.Voltage failure of an AC generator may be caused by

328.Voltage generated by most AC generators is fed from the machine to the bus by means of

329.What is the approximate voltage per cell produced by the nickel-iron (Edison) battery?

2. cell voltages are excessive nmlkj

3. specific gravity in insufficient nmlkj

4. charging rate is excessive nmlkj

1. electrolyte specific gravity is too low nmlkj

2. charging rate is too high nmlkj

3. plate separators are grounded nmlkj

4. battery compartment ventilation is inadequate nmlkj

1. failure of the exciter generator nmlkj

2. a tripped bus circuit breaker nmlkj

3. high mica segments on the stator bus bar nmlkj

4. excessive prime mover speed nmlkj

1. brushes on a commutator nmlkj

2. brushes on slip rings nmlkj

3. slip rings on a commutator nmlkj

4. direct connections from the stator nmlkj

1. 0.85 volts nmlkj

2. 1.35 volts nmlkj

3. 2.20 volts nmlkj

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330.What is the approximate voltage produced by a nickel-cadmium battery cell?

331.What is the maximum allowable primary current of a 2 KVA step-down transformer with a four to one turns ratio if connected across a 440 volt line?

332.What is the total current in the illustrated EL-0021 circuit with a 6 volt battery if the resistance of R1 is 2 ohms, R2 is 4 ohms, and R3 is 4 ohms?

Maximizeaza

4. 6.05 volts nmlkj

1. 1.25 volts nmlkj

2. 1.50 volts nmlkj

3. 2.20 volts nmlkj

4. 6.05 volts nmlkj

1. 1.1 amps nmlkj

2. 4.5 amps nmlkj

3. 18.1 amps nmlkj

4. 27.7 amps nmlkj

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333.What type of rotor is used in split-phase motors?

334.What will be the frequency of a three-phase, six pole, AC generator operating at 1800 revolutions per minute?

335.When a battery is continuously exposed to low temperatures, the best procedure to keep it from freezing is to

336.When a lead-acid battery begins gassing freely while receiving a normal charge, the charging current should

1. 0.6 amp nmlkj

2. 1 amp nmlkj

3. 4 amps nmlkj

4. 6 amps nmlkj

1. Drum nmlkj

2. Salient pole nmlkj

3. Squirrel-cage nmlkj

4. Wound-rotor nmlkj

1. 60 hertz nmlkj

2. 90 hertz nmlkj

3. 120 hertz nmlkj

4. 180 hertz nmlkj

1. remove the battery caps nmlkj

2. securely cover the battery nmlkj

3. keep the battery fully charged nmlkj

4. disconnect the battery nmlkj

1. be increased nmlkj

2. remain unchanged nmlkj

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337.When a lead-acid battery begins gassing freely while receiving a normal charge, the charging current should be

338.When a nickel-cadium battery begins gassing while connected to the battery charging circuit, you should

339.When a transformer is used to step down voltage, the low voltage winding is

340.When an alternator is to remain idle for even a few days

3. be decreased nmlkj

4. shut off nmlkj

1. increased nmlkj

2. shut off nmlkj

3. decreased nmlkj

4. unchanged nmlkj

1. do nothing as this is a normal condition when charging nmlkj

2. add distilled water to each cell to reduce the specific gravity of the electrolyte

nmlkj

3. add potassium hydroxide to each cell to increase the specific gravity of the electrolyte

nmlkj

4. decrease the charging rate nmlkj

1. part of the core nmlkj

2. the primary coil nmlkj

3. not insulated nmlkj

4. the secondary coil nmlkj

1. lift the brushes and disconnect the pigtails nmlkj

2. insulate the collector rings with strips of cardboard nmlkj

3. energize the heater circuit nmlkj

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341.When charging a 100 amp-hour lead-acid battery,

342.When charging a nickel-cadmium battery,

343.When charging lead-acid batteries, the charging rate should be reduced as the battery nears its full charge to

344.When charging lead-acid batteries, you should reduce the charging rate as the battery nears its full charge capacity to

4. open the equalizing bus disconnect switch nmlkj

1. the temperature of the electrolyte should not be allowed to exceed 90°F nmlkj

2. the charging rate should be no greater than 125% of the battery amp-hour rating

nmlkj

3. the source of power for charging should be 2.5 volts per cell nmlkj

4. gassing within the battery decreases when nearing full charge and it will be necessary to reduce the charging current to a low finishing rate

nmlkj

1. the charging rate should be lessened when gassing commences nmlkj

2. overcharging should be avoided nmlkj

3. the specific gravity of the electrolyte will be unaffected by the state of charge

nmlkj

4. add distilled water just prior to charging to insure proper mixing nmlkj

1. prevent damaging battery plates nmlkj

2. allow equalization of cell voltages nmlkj

3. reduce lead sulfate deposits nmlkj

4. increase lead peroxide formation nmlkj

1. prevent excessive gassing and overheating nmlkj

2. allow equalization of cell voltages nmlkj

3. reduce lead sulfate deposits nmlkj

4. increase lead peroxide formation nmlkj

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345.When checking the specific gravity of the battery electrolyte with a hydrometer, you should be aware that

346.When choosing a battery for a particular application, major consideration should be given to the battery's

347.When choosing a battery for a particular application, major consideration should be given to the battery's

348.When correcting specific gravity readings of a lead-acid battery for existing temperature conditions, you should

1. the battery is fully charged when the float sinks deepest into the electrolyte

nmlkj

2. the battery is discharged when the float is highest in the electrolyte nmlkj

3. a hydrometer reading is accurate if taken immediately after water is added to the cell

nmlkj

4. warm temperatures will lower the specific gravity of the electrolyte nmlkj

1. amp-hour capacity nmlkj

2. terminal polarity nmlkj

3. stability under charge nmlkj

4. ambient temperature rise nmlkj

1. amp-hour capacity nmlkj

2. terminal polarity nmlkj

3. stability under charge nmlkj

4. ambient temperature rise nmlkj

1. add 10 points for each 4° above 80°F nmlkj

2. subtract 10 points for each 4° above 80°F nmlkj

3. add 4 points for each 10° above 80°F nmlkj

4. add 4 points for each 10° below 80°F nmlkj

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349.When lead-acid batteries are charging, they always give off hydrogen gas that is

350.When mixing electrolyte for a lead-acid storage battery,

351.When mixing electrolyte for a lead-acid storage battery, you should pour the

352.When mixing electrolyte, which of the following precautions should always be observed?

353.When paralleled, AC generators must have the same

1. considered inert nmlkj

2. highly explosive nmlkj

3. extremely toxic nmlkj

4. heavier than air nmlkj

1. stirring should always be avoided nmlkj

2. a lead container should always be used nmlkj

3. always pour the water into the acid nmlkj

4. always pour the acid into the water nmlkj

1. distilled water into the acid in a zinc-plated container nmlkj

2. distilled water into the acid in a glass container nmlkj

3. acid into the distilled water in a zinc-plated container nmlkj

4. acid into distilled water in a glass container nmlkj

1. Add the acid to the water. nmlkj

2. Use a heavy duty aluminum pail. nmlkj

3. Add the water to the acid. nmlkj

4. Mix the solution outdoors. nmlkj

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354.When paralleling two AC generators, the frequency (cycles) of the incoming generator, just prior to closing the circuit breaker, should be

355.When paralleling two AC generators, the frequency of the incoming machine immediately prior to closing its breaker should be

356.When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be

357.When paralleling two AC generators, the synchroscope selector switch and frequency meter switch should be set up to sense the frequency of the

1. frequency nmlkj

2. number of phases nmlkj

3. phase rotation nmlkj


1. slightly less than the frequency of the generator on the line nmlkj

2. the same as the frequency of the generator on the line nmlkj

3. slightly more than the frequency of the generator on the line nmlkj


1. controlled by placing the governor switch in the automatic position nmlkj

2. adjusted with the voltage regulator nmlkj

3. slightly greater than the bus frequency nmlkj

4. slightly less than the bus frequency nmlkj

1. slightly less than the oncoming generator frequency nmlkj

2. the same as the bus frequency nmlkj

3. slightly greater than the bus frequency nmlkj

4. the same as the bus voltage nmlkj

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358.When paralleling two alternators the synchronizing lamps grow dim and are totally darkened as the synchroscope pointer approaches the 0° position This indicates the

359.When paralleling two alternators using three synchronizing lamps, the flickering of all three lamps becomes progressively slower and slower This means the

360.When paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0° This indicates the

361.When securing an AC generator, you should FIRST

1. bus nmlkj

2. generator on the line nmlkj

3. oncoming generator nmlkj

4. bus transfer relay nmlkj

1. alternator voltages are 180° apart nmlkj

2. incoming alternator is running too fast nmlkj

3. incoming alternator is in phase with the bus voltage nmlkj

4. synchroscope pointer is defective or broken nmlkj

1. frequency of the incoming generator is approaching that of the bus nmlkj

2. frequency of the incoming alternator is less than that of the bus nmlkj

3. phase rotation of the incoming alternators is opposite to that of the bus nmlkj

4. terminal voltage of the incoming alternator is approaching that of the bus nmlkj

1. incoming alternator is running too fast nmlkj

2. alternator voltages are 180 degrees apart nmlkj

3. synchroscope is defective or broken nmlkj

4. alternator power factors are in phase nmlkj

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362.When shore power is being connected to a ship in dry dock,

363.When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding

364.When troubleshooting a lead-acid storage battery, a weak or dead cell is best detected by

365.When troubleshooting an alkaline storage battery a weak or dead cell is best located by

1. open the generator circuit breaker nmlkj

2. switch the voltage regulator to 'manual' nmlkj

3. decrease the field excitation to minimum nmlkj

4. reduce the load on the unit nmlkj

1. the ship's generators are paralleled with the shore power to provide continuous power

nmlkj

2. proper phase sequence must be established nmlkj

3. exactly 450 volts must be supplied from the shore nmlkj

4. exactly 60 Hz must be provided by the terminal nmlkj

1. distilled water only nmlkj

2. sulfuric acid only nmlkj

3. a weak solution of sulfuric acid and distilled water nmlkj

4. a strong solution of sulfuric acid and distilled water nmlkj

1. measuring and comparing all cells' specific gravity nmlkj

2. taking an open circuit voltage test of individual cells nmlkj

3. visually inspecting the electrolyte levels of each cell nmlkj

4. taking each cell's temperature with a calibrated mercury thermometer nmlkj

1. checking the specific gravity of each cell nmlkj

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366.When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer rotating in the

367.When you check the specific gravity of the battery electrolyte with a hydrometer, it should be kept in mind that

368.Which of the devices listed is indicated by the symbols lettered "A" to "F", shown in the illustration?

Maximizeaza

2. visually inspecting each cell's electrolyte level nmlkj

3. testing each cell with a voltmeter nmlkj

4. measuring the electrolyte temperature with an accurate mercury thermometer

nmlkj

1. 'slow' direction, just before the 12 o'clock position nmlkj

2. 'fast' direction, just after the 12 o'clock position nmlkj

3. 'fast' direction, just before the 12 o'clock position nmlkj

4. 'slow' direction, just after the 12 o'clock position nmlkj

1. the battery is fully charged when the indicator floats low in the electrolyte nmlkj

2. any water that has been previously added to the cells will dilute the solution and give a false reading

nmlkj

3. a hydrometer reading is inaccurate if taken immediately after water is added to the cell

nmlkj

4. temperature has no effect on hydrometer readings nmlkj

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369.Which of the devices shown in the illustration automatically prevents the simultaneous operation of the windlass from both master switches?

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1. Diodes nmlkj

2. Linear inductors nmlkj

3. Capacitors nmlkj

4. Transistors nmlkj

1. Selector switch nmlkj

2. Contact 'CR1a' nmlkj

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370.Which of the following actions must be carried out prior to closing the alternator circuit breaker according to the graph shown in the illustration?

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371.Which of the following activities occurs during the charging process of a lead-acid storage battery?

372.Which of the following components are used to convert alternating current produced in the generator windings to direct current?

3. Contact 'CR2a' nmlkj

4. Contact 'CR1D' nmlkj

1. Increase the alternator voltage. nmlkj

2. Decrease the line voltage. nmlkj

3. Increase the line voltage. nmlkj

4. Decrease the line frequency. nmlkj

1. The specific gravity of the acid increases. nmlkj

2. Both plates change chemically to lead sulfate. nmlkj

3. The specific gravity of the acid decreases. nmlkj

4. Hydrogen gas is absorbed. nmlkj

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373.Which of the following conditions indicates that a lead-acid battery is being charged too rapidly?

374.Which of the following devices should be used to measure the temperature of a battery electrolyte?

375.Which of the following losses is/are present in every direct current generator armature?

376.Which of the following problems is indicated if a lead-acid battery begins to gas violently when it is first placed on charge?

1. Armature and equalizer nmlkj

2. Commutator and brushes nmlkj

3. Rotor and interpoles nmlkj

4. Field and exciter nmlkj

1. Sparks occurring at the positive terminal. nmlkj

2. Unusually high electrolyte specific gravity. nmlkj

3. Low plate potentials being developed. nmlkj

4. Excessively high temperatures and gassing rates. nmlkj

1. Mercury thermometer nmlkj

2. Alcohol thermometer nmlkj

3. Thermocouple pyrometer nmlkj

4. Potentiometer nmlkj

1. Winding copper loss nmlkj

2. Core eddy current loss nmlkj

3. Magnetic hysteresis loss nmlkj


1. Insufficient compartment ventilation is being provided. nmlkj

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377.Which of the following statements about a three-phase wye connection is correct?

378.Which of the following statements concerning nickel-cadmium batteries is true?

379.Which of the following statements concerning the specific gravity of a battery electrolyte is true?

380.Which of the following statements is true concerning a stepdown transformer in an operating AC power circuit?

2. A short circuit exists in one of the battery cells. nmlkj

3. The battery is undergoing its normal charging rate. nmlkj

4. An excessive charging rate is being applied to the battery. nmlkj

1. The line current is 1.73 times the phase current. nmlkj

2. The phase current is 1.73 times the line current. nmlkj

3. The line voltage is 1.73 times the phase voltage. nmlkj

4. The phase voltage is 1.73 times the line voltage. nmlkj

1. When mixing electrolyte always add acid to the water. nmlkj

2. Nickel-cadmium batteries can be charged and discharged only a limited number of times without damage to the cells.

nmlkj

3. Nickel-cadmium batteries can be stored for a long time and still keep a full charge without additional charging.

nmlkj

4. The electrolyte of an idle nickel-cadmium battery must be replaced monthly to maintain battery condition.

nmlkj

1. The electrolyte becomes less dense when it is cooled. nmlkj

2. The specific gravity reading is lowered when the electrolyte is heated. nmlkj

3. The most accurate hydrometer reading is obtained immediately after water is added.

nmlkj

4. The temperature does not affect the specific gravity of the electrolyte. nmlkj

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381.Which of the following statements is true concerning all three-phase alternators?

382.Which of the following statements is true concerning the operation of two alternators in parallel?

383.Which of the following temperatures represents the maximum allowable temperature for the electrolyte of a lead-acid battery?

384.Which of the listed battery charging circuits is used to maintain a wet-cell, lead-acid, storage battery in a fully charged state during long

1. Voltage and current will both be increased. nmlkj

2. Voltage and current will both be decreased nmlkj

3. Voltage decreases as current increases. nmlkj

4. Voltage increases as current decreases. nmlkj

1. Each has three separate but identical armature windings acted on by one system of rotating magnets.

nmlkj

2. Each has one armature winding acted on by three identical but separate systems of rotating magnets.

nmlkj

3. All three-phase alternators are designed to operate with a 0.8 leading power factor.

nmlkj

4. The three phases always provide power to the load through three sets of slip rings and brushes.

nmlkj

1. The cycles per second of each alternator are the same. nmlkj

2. Both alternator governors must be set with the same amount of speed droop.

nmlkj

3. The number of field poles must be the same on each alternator. nmlkj

4. The load must always be divided equally between alternators. nmlkj

1. 100°F nmlkj

2. 125°F nmlkj

3. 145°F nmlkj

4. 212°F nmlkj

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periods of disuse?

385.Which of the listed figures shown in the illustration EL-0084 represents devices connected in a three-phase delta-wye arrangement?

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386.Which of the listed forms of water should be added to a lead-acid battery?

1. Normal charging circuit nmlkj

2. Quick charging circuit nmlkj

3. Trickle charging circuit nmlkj

4. High ampere charging circuit nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

1. saltwater nmlkj

2. brackish water nmlkj

3. distilled water nmlkj

4. light water nmlkj

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387.Which of the listed ranges represents specific gravity corrected for temperature for the electrolyte of a fully charged portable lead-acid battery?

388.Which of the listed safety features should be provided in small rooms or lockers where batteries are stored?

389.Which of the problems listed will occur if a lead-acid battery is allowed to remain in a discharged condition for a long period of time?

390.Which of the processes listed occurs during the charging of a lead-acid storage battery?

1. 1.100 to 1.150 nmlkj

2. 1.180 to 1.200 nmlkj

3. 1.280 to 1.300 nmlkj

4. 1.750 to 2.000 nmlkj

1. Installation of a fixed CO2 system. nmlkj

2. An exhaust duct is to be provided and led from within three inches of the deck.

nmlkj

3. Power ventilation is to be provided if trickle charging is utilized. nmlkj

4. An exhaust duct is to be provided and led from the top of the locker to the open air.

nmlkj

1. The battery may be unable to accept a full charge. nmlkj

2. The electrolyte will change to lead sulfate. nmlkj

3. The concentrated sulfuric acid will attack the lead peroxide plates. nmlkj

4. The separators will harden. nmlkj

1. Negative plates change to lead peroxide. nmlkj

2. Positive plates change to lead peroxide. nmlkj

3. Both plates change to lead peroxide. nmlkj

4. Both plates change to lead sulfate. nmlkj

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391.Which of the substances listed should be applied to battery terminals to help prevent corrosion?

392.Which of the synchroscope illustrations depicts the appropriate direction of rotation and position for closing the circuit breaker when paralleling AC generators?

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393.While paralleling two (2) AC generators using synchronizing lamps only, both lamps will go dark when the generators are

1. Zinc chromate nmlkj

2. Lead hydroxide nmlkj

3. Lead peroxide nmlkj

4. Petroleum jelly nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

1. running at the same speed nmlkj

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394.Why is it desirable to operate paralleled AC generators at the same power factor?

395.You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow direction This indicates that the frequency of the incoming machine is

396.You are attempting to parallel two AC generators and the synchroscope pointer is revolving slowly in the fast direction You should

397.You are attempting to parallel two AC generators and the synchroscope pointer stops at a position other than 0° If you close the

2. grounded nmlkj

3. of the same polarity nmlkj

4. in phase nmlkj

1. Circulating currents are kept to a minimum. nmlkj

2. Field excitation losses are kept to a minimum. nmlkj

3. Generator rotors will have a lesser tendency to hunt. nmlkj

4. Because a power factor increase will decrease kilowatt output. nmlkj

1. higher than the bus frequency nmlkj

2. lower than the bus frequency nmlkj

3. the same as the bus frequency but out of phase with it nmlkj

4. the same as the bus frequency, and the circuit breaker may be closed at any pointer position

nmlkj

1. use the governor control switch to adjust the incoming voltage so it is equal to the bus voltage

nmlkj

2. use the governor control switch to increase the speed of the machine on the line only

nmlkj

3. close the circuit breaker when the synchroscope pointer approaches the 0° position

nmlkj

4. use the field rheostat to adjust the speed of the incoming machine nmlkj

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circuit breaker at this moment

398.You are attempting to parallel two AC generators and the synchroscope pointer stops at a position other than 0° prior to closing the circuit breaker This indicates

399.You are attempting to parallel two AC generators, and the synchroscope pointer is revolving fast in the clockwise direction This indicates that the frequency of the incoming machine is

400.You are paralleling two alternators The synchronizing lamps grow dim and are totally darkened as the synchroscope pointer approaches the 0° position This indicates that the

1. the incoming machine will accept all of the load nmlkj

2. the incoming machine will trip out on low voltage release nmlkj

3. a hazardous condition will be created by the cross current between the machines

nmlkj

4. a hazardous condition will be created by the incoming machine being at a higher frequency than the bus

nmlkj

1. the frequency of the incoming machine is the same as the bus frequency nmlkj

2. the incoming machine is in phase with the bus, but the frequency is not the same

nmlkj

3. the circuit breaker may be closed after breaker has been reset nmlkj

4. there is an existing cross current between generators nmlkj

1. higher than the bus frequency nmlkj

2. lower than the bus frequency nmlkj

3. the same as the bus frequency and the circuit breaker may be closed at any pointer position

nmlkj

4. the same as the bus frequency but out of phase with it nmlkj

1. alternator voltages are 180° apart nmlkj

2. circuit breaker can be closed nmlkj

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401.A loud buzzing noise in an AC controller is probably caused by

402.A temperature instrumentation system for an engine room console consists of a resistance temperature detector (RTD), a measuring bridge circuit, and a meter (or alarm circuit). Which of the following statements is true concerning the measuring bridge circuit?

403.A tubular fuse should always be removed from a fuse panel with

404.Aboard ship, a grounded field coil in an AC motor can be determined by using a

3. incoming alternator is running too slowly nmlkj

4. synchroscope is defective or broken nmlkj

1. poor contact with the overload relay nmlkj

2. an incorrectly sized heater nmlkj

3. a broken shading coil nmlkj

4. abnormal starting current nmlkj

1. The input voltage varies in a linear fashion with temperature. nmlkj

2. The voltage across the center of the resistance bridge is always constant. nmlkj

3. The resistance bridge is said to be balanced when its output voltage is zero.

nmlkj

4. The input voltage of the resistance bridge is the constant temperature signal.

nmlkj

1. a screwdriver nmlkj

2. a pair of insulated metal pliers nmlkj

3. any insulated object nmlkj

4. fuse pullers nmlkj

1. portable growler nmlkj

2. galvanometer nmlkj

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405.An advantage of DC motors over AC motors is that they

406.An electrical connection between the wiring of an electric motor and its metal frame is known as a/an

407.Before touching a small capacitor connected to a de-energized circuit, or even one that is completely disconnected, you should

408.Compressed air should not be used to clean motor controller equipment because

3. visual inspection nmlkj

4. megohmmeter nmlkj

1. are less expensive nmlkj

2. require less maintenance nmlkj

3. can be started across the line nmlkj

4. offer a more effective means of controlling speed nmlkj

1. eddy current nmlkj

2. ground nmlkj

3. impedance nmlkj

4. flux leakage nmlkj

1. gently tap the body with a screwdriver nmlkj

2. tag it with a de-energized tag nmlkj

3. be equipped with an insulated fuse puller nmlkj

4. short circuit the terminals to make sure that the capacitor is discharged nmlkj

1. it may force metallic particles into coil insulation nmlkj

2. the surrounding area may need additional cleaning nmlkj

3. the air blast dries out insulation quickly nmlkj

4. a mask and respirator would be required nmlkj

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409.Electrical failures in motors are caused by the breakdown of insulation, which may be caused by

410.Encrusted dirt accumulated inside a motor should be removed with a

411.For more complete vessel protection when using an impressed current cathodic system

412.If 450 volts AC were measured across the load as shown in the illustration it would indicate a/an

Maximizeaza

1. penetration of moisture nmlkj

2. accumulation of dirt nmlkj

3. overheating nmlkj


1. fiber scraper nmlkj

2. pointed welding rod nmlkj

3. hammer and chisel nmlkj

4. paint scraper nmlkj

1. all ship's service alternators have additional temperature sensing devices and a thermal recorder installed

nmlkj

2. machinery on deck and in the engineroom is first coated with zinc chromate before final painting

nmlkj

3. the hull's magnetic fields are aligned with a solid-state degaussing circuit using SCR's

nmlkj

4. straps connect the rudder with the hull and the propeller shaft is grounded through a slip ring/brush arrangement

nmlkj

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413.If a small electric motor has been submerged in saltwater for a short period of time, you should

414.If a small electric motor is imersed in salt water it should be I washed in fresh water II dried in an oven

415.If an electric motor fails to start, you should FIRST check the

1. open winding between 'H1' and 'X1' nmlkj

2. properly operating circuit nmlkj

3. open winding between 'X1' and 'X4' nmlkj

4. ground on one side of 'Ep' nmlkj

1. send it ashore for rewinding nmlkj

2. rinse it with warm freshwater and bake it dry in an oven nmlkj

3. soak it in a bucket of commercial solvent and bake with internal heat nmlkj

4. clean it with carbon tetrachloride and blow it out with compressed air nmlkj

1. I only nmlkj

2. II only nmlkj



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416.If the illustrated EL-0007 motor fails to start and gives a loud hum when the start button is pushed, the problem is

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417.If the line voltage to the controller shown in the illustration is 440 volts, what is applied across the control circuit?

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1. phase sequence nmlkj

2. ampere load nmlkj

3. fuse or circuit breaker nmlkj

4. line frequency nmlkj

1. one of the phases to the motor is not energized because of an open motor lead

nmlkj

2. the 'Disc.sw.' is open nmlkj

3. power to 'L1' at the 'Disc.sw.' is not energized because of a problem with the ship's electrical distribution system

nmlkj

4. 'OL1' is open because of 'T1' overload causing the motor to single phase nmlkj

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418.If the motor fails to start and a voltmeter reading between 1 and 6, as illustrated EL-0007, indicates line voltage, your next step should be to

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1. 110 volts nmlkj

2. 220 volts nmlkj

3. 440 volts nmlkj

4. 660 volts nmlkj

1. replace fuse "10A" nmlkj

2. replace or repair contact 'Ma' nmlkj

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419.If there is a reduction in the normally supplied frequency to a 120/240 volt, three-phase AC current motor from 60 hertz to 55 hertz, the motor would

420.Impressed current cathodic protection is used on vessels instead of

421.In a cartridge-type fuse, the metal element is contained in a

422.In an AC generator, direct current from a separate source is passed through the windings of the rotor

3. reset and determine the cause of the overload nmlkj

4. check line voltage between L1 and L3 nmlkj

1. run at a slower speed nmlkj

2. operate at a lower current nmlkj

3. vibrate excessively nmlkj

4. trip off the line nmlkj

1. fire alarm systems nmlkj

2. repeated painting nmlkj

3. sacrificial zincs nmlkj

4. vacuum tube degaussing systems nmlkj

1. porcelain window nmlkj

2. thermal cut out nmlkj

3. fiber tube nmlkj

4. flasher device nmlkj

1. by means of slip rings and brushes nmlkj

2. by means of a commutator nmlkj

3. by means of rotating bar magnet nmlkj

4. to minimize the danger of arc over nmlkj

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423.In an impressed current cathodic protection system, the anode is

424.In the illustration EL-0031, the component labeled "G" is

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425.Magnetic controller contacts may become welded together during operation because of

1. connected to the hull and deteriorates with time nmlkj

2. insulated from the hull and does not waste away nmlkj

3. connected to the hull but does not waste away nmlkj

4. insulated from the hull but deteriorates with time nmlkj

1. hard rubber, plastic or bituminous composition nmlkj

2. porous inside to absorb excess positive ions nmlkj

3. precharged for (-) and (+) in manufacturing nmlkj

4. All the above nmlkj

1. excessive magnetic gap nmlkj

2. low contact pressure nmlkj


4. excessive ambient temperature nmlkj

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426.Motor controller or starter contacts may become pitted and welded together if the contacts

427.Motor starter or controller contacts may become welded together if the contacts

428.Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an

429.Reduced voltage applied to a motor during the starting period will

430.Section II of the circuit shown in the illustration is the

Maximizeaza

1. open under loaded conditions nmlkj

2. close slowly with light pressure nmlkj

3. open too quickly and arc nmlkj

4. close quickly with proportionate pressure nmlkj

1. open too quickly and arc nmlkj

2. close under excessive pressure nmlkj

3. open or close too quickly nmlkj

4. close under excessive starting current nmlkj

1. overvoltage release nmlkj

2. thermal acting trip nmlkj

3. thermal overload relay nmlkj

4. current overload relay nmlkj

1. result in decreased acceleration time only nmlkj

2. lower the starting current and increase accelerating time nmlkj

3. cause a greater starting torque nmlkj

4. increase the starting current and pump capacity nmlkj

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431.Since fuse elements are made of zinc or any alloy of tin and lead, the melting point of the fuse element must be

432.The amount of current flow required for the cathodic protection of a vessel is dependent upon the

433.The device shown in the illustration EL-0083 is being used


2. filter nmlkj

3. rectifier nmlkj

4. voltage transformer nmlkj

1. higher than that of copper nmlkj

2. lower than that of copper nmlkj

3. equal to that of copper nmlkj

4. reached when the conductor it is protecting becomes 'white hot.' nmlkj

1. amount of bare steel surface nmlkj

2. speed of the ship through the water nmlkj

3. temperature of the water nmlkj


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434.The device that most commonly utilizes the principle of electromagnetic induction is the

435.The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the

436.The illustrated EL-0024 circuit is a wheatstone bridge If the meter

1. in a step-down operation nmlkj

2. in a step-up operation nmlkj

3. in an isolation circuit nmlkj

4. as a filter nmlkj

1. diode nmlkj

2. transformer nmlkj

3. transistor nmlkj

4. rheostat nmlkj

1. loss of residual magnetism nmlkj

2. absorption of moisture in the insulation nmlkj

3. insulation varnish flaking nmlkj

4. dirt collecting on the windings nmlkj

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"G" reads 0 with the switch closed then

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437.The motor starts when the start button in the illustration EL-0007 is pushed, but stops when the button is released the trouble is

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1. the current through R1 - R2 is equal to the current through R3 - Rx nmlkj

2. the voltage across b - d is equal to the voltage of E nmlkj

3. the resistance of Rx is equal to the resistance of R2 nmlkj

4. all the above are true nmlkj

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438.The part of a fuse that melts and opens the circuit is made of

439.The primary function of an electric motor is to

440.The proper way to apply plastic electrical tape to an electric cable splice is to

441.The purpose of an impressed current cathodic protection system aboard ship is to

1. the incorrect thermal overload coil nmlkj

2. a faulty "M" coil nmlkj

3. a dirty contact on the Disc.Sw. at 'L3' nmlkj

4. a faulty holding relay contact nmlkj

1. copper and antimony nmlkj

2. steel and babbitt nmlkj

3. aluminum or beryllium alloy nmlkj

4. zinc or an alloy of tin and lead nmlkj

1. develop torque nmlkj

2. generate high voltages nmlkj

3. produce a magnetic field nmlkj

4. generate high electrical resistance nmlkj

1. apply tape to the braided cover, but avoid touching it nmlkj

2. wind the tape so that each turn overlaps the turn before it nmlkj

3. apply the tape in one non-overlapping layer only nmlkj

4. heat the tape with a soldering iron for good bonding nmlkj

1. prevent corrosion of the hull, propeller, rudder and line shafting nmlkj

2. neutralize the vessel's stray magnetic fields which would interfere with radar

nmlkj

3. protect engine room and deck machinery from oxidation in the presence nmlkj

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442.The speed of a squirrel-cage motor is usually changed by

443.The turns ratio of device "A" shown in the illustration EL-0082 is four to one and all taps are evenly spaced. If 110 volts were applied to terminals 'X1' and 'X3', what would be indicated across 'H1' and 'H2'?

Maximizeaza

444.The Wheatstone bridge is a precision measuring instrument utilizing the principle of changes in

of salt air

4. maintain a minimum constant alternator load to prevent overheating nmlkj

1. varying the frequency to the machine nmlkj

2. adding resistance in series with the stator windings nmlkj

3. adding resistance in parallel with the stator windings nmlkj

4. changing the number of connected poles in the stator nmlkj

1. 37.5 volts nmlkj

2. 55 volts nmlkj

3. 220 volts nmlkj

4. 440 volts nmlkj

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445.Time delayed or delayed action-type fuses are designed to

446.To repair a small electrical motor that has been submerged in saltwater, you should

447.What precaution should be taken with a vessel's impressed current cathodic protection system after a drydocking period during which the hull has been painted?

448.What type of electric motor is commonly used to start small auxiliary diesel engines?

1. inductance nmlkj

2. capacitance nmlkj

3. resistance nmlkj

4. amperage nmlkj

1. prevent grounds in branch circuits nmlkj

2. prevent opens in motor circuits nmlkj

3. permit momentary overloads without melting nmlkj

4. guard lighting and electronic circuits nmlkj

1. wash it with fresh water and apply an external source of heat nmlkj

2. renew the windings nmlkj

3. send it ashore to an approved service facility nmlkj

4. rinse all electrical parts with a carbon tetrachloride cleaning solvent and then blow dry the motor with compressed air

nmlkj

1. Output currents should be carefully monitored to assure operation at nearly 100 % capacity for proper curing.

nmlkj

2. Reference cell voltages should be maintained at half the normal range for approximately 48 hours.

nmlkj

3. The unit should remain off for the specified amount of time so as not to disturb curing.

nmlkj

4. A slight (10-15%) overcurrent to the anodes should be allowed in order to speed drying.

nmlkj

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449.When power is restored after a complete power failure, a steering gear pump motor will

450.When reading electrical motor controller diagrams, it helps to know that

451.When removing ball or roller bearings from the shaft of a motor, you should use a

452.When testing a capacitor with an analog type ohmmeter, a good capacitor will be indicated when

1. synchronous nmlkj

2. series nmlkj

3. shunt nmlkj

4. cage nmlkj

1. have to be restarted nmlkj

2. have to be reset nmlkj

3. restart automatically nmlkj

4. trip its overload relays nmlkj

1. current paths in the control circuit are drawn as heavy lines and in the power circuit as lighter lines

nmlkj

2. current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines

nmlkj

3. circuits subject to 500 volts or greater are drawn as heavy lines and below 500 volts as lighter lines

nmlkj

4. circuits subject to 500 volts or greater are drawn as light lines and below 500 volts as heavy lines

nmlkj

1. rawhide hammer nmlkj

2. brass mallet nmlkj

3. wheel puller nmlkj

4. soft iron pry bar nmlkj

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453.When testing for blown fuses in a three-phase supply circuit to a motor, you should first

454.When the motor shown in the illustration EL-0010 is running and the stop button is pushed, which of the following statements will hold true?

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1. there is no meter deflection nmlkj

2. the meter deflects to a low resistance value and remains there nmlkj

3. the meter deflects to a low resistance value and slowly increases towards infinity

nmlkj

4. the meter deflects to a low resistance value and increases rapidly to a higher value, but stays fairly low

nmlkj

1. apply the megger across the tops of the line fuses nmlkj

2. apply an ammeter diagonally across the top of the first line fuse and the bottom of the third line fuse

nmlkj

3. apply the voltage tester across the bottoms of the line fuses nmlkj

4. ensure the circuit is de-energized, and then use a continuity tester nmlkj

1. Coil "M" will now be energized. nmlkj

2. Coil 'CR' will now be energized. nmlkj

3. Contact "M" will close as contact 'CR' opens. nmlkj

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455.When troubleshooting a console circuit card which is suspected of being faulty, the first step would be to

456.Which component of the circuit shown in the illustration EL-0081 is the ballast?

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457.Which of the following actions must be carried out before a voltage tester can be used to test the three line fuses to a three-phase motor?

4. Contacts "M" and 'CR' will open. nmlkj

1. pull the card and measure the value of all resistors nmlkj

2. check for the correct value and polarity of all power connections to the card

nmlkj

3. de-energize and pull the card to visually inspect for burned components nmlkj

4. check for continuity of circuit board traces and then the gain of each transistor

nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

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458.Which of the following procedures should be used to maintain a large electric motor during periods of inactivity?

459.Which of the following statements is true concerning the operating characteristics of a squirrel-cage motor?

460.Which of the illustrations listed below is representative of a motor controller's 'schematic' or 'elementary' diagram?

1. The fuses must be removed from the circuit. nmlkj

2. The starter must be placed in the STOP position to stop the motor. nmlkj

3. The three line connections in the motor terminal box must be disconnected and tagged.

nmlkj

4. Nothing need be done as long as the motor is running under a light load. nmlkj

1. A thin layer of air-drying varnish should be applied on the windings. nmlkj

2. Compressed air should be blown over areas where dust is deposited. nmlkj

3. Spraying a solvent periodically to remove carbon dust. nmlkj

4. Space heaters should be used to prevent condensation of moisture. nmlkj

1. Rotor slip is dependent upon the motor load. nmlkj

2. An increase in motor load results in less slip. nmlkj

3. A decrease in rotor speed results in less generated current. nmlkj

4. A decrease in rotor speed produces a weaker magnetic field. nmlkj

1. EL-0023 Maximizeaza

nmlkj

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2. EL-007

Maximizeaza

nmlkj

3. EL-037 Maximizeaza

nmlkj

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461.Which of the instruments listed could be use to locate a grounded field coil in a synchronous motor?

462.Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?

4. EL-058

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nmlkj

1. Ammeter nmlkj

2. Voltmeter nmlkj


4. Frequency meter nmlkj

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463.Which of the listed types of motor controllers and starters is illustrated?

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464.Which section of the circuit shown in the illustration changes AC to DC?

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1. Open the machine on both ends so as to allow the air and dust to escape. nmlkj

2. Be certain that the circuit breaker is opened and tagged on the feeder panel.

nmlkj

3. Be certain that the air is clean and as dry as possible. nmlkj


1. Across-the-line nmlkj

2. Primary-resistor nmlkj

3. Autotransformer nmlkj

4. Part-winding nmlkj

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465.While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an ohmmeter is to be used to check its value?

466.A contactor differs from a relay in that:

1. I nmlkj

2. II nmlkj

3. III nmlkj

4. IV nmlkj

1. Correct polarity must be observed because reverse bias will damage the component.

nmlkj

2. Meter leads must not be twisted so as to cancel out the individual magnetic fields.

nmlkj

3. Resistor's circuit must be de-energized and at least one end of the component isolated.

nmlkj

4. The meter case must be grounded prior to attaching the leads. nmlkj

1. it operates on a different principle. nmlkj

2. its contacts can interrupt large motor currents. nmlkj

3. gravity and spring tension open contacts. nmlkj

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467.A hydrometer is used to measure the

468.A loud buzzing noise at the contacts of a magnetic controller could indicate

469.A loud buzzing noise coming from the contacts in a magnetic controller can be caused by

470.A low-voltage protection circuit is used in electric motor starting equipment to


1. specific gravity of a battery electrolyte nmlkj

2. water pressure in a deck pipeline nmlkj

3. amount of potable water a vessel is taking on nmlkj

4. power developed by a salt water service pump nmlkj

1. weak contact spring pressure nmlkj

2. misalignment of the magnet faces nmlkj

3. excessive line current nmlkj

4. mechanical binding nmlkj

1. excessive current nmlkj

2. excessive magnet gap nmlkj

3. bouncing of contacts nmlkj

4. dirt on magnet faces nmlkj

1. trip circuit contactors when the motor overspeeds due to low voltage nmlkj

2. trip circuit contactors when the motor develops a short circuit due to low voltage

nmlkj

3. allow the motor to restart automatically on restoration of voltage without manually resetting

nmlkj

4. prevent the motor from restarting automatically on restoration of voltage nmlkj

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471.A semiconductor is a material with a

472.A semiconductor that decreases in resistance with an increase in temperature is known as a

473.A silicon controlled rectifier (SCR) is a solid state device used to change

474.A strain-relief device must be provided where a cord enters an appliance. The purpose of this device is:

475.An electromechanical relay is basically:

1. conductivity higher than a normal conductor nmlkj

2. conductivity higher than a normal insulator nmlkj

3. high conductivity at low temperatures nmlkj

4. low conductivity at high temperatures nmlkj

1. resistor nmlkj

2. thermistor nmlkj

3. diode nmlkj

4. thermopile nmlkj

1. DC to AC and control relatively low load current nmlkj

2. AC to DC and control relatively high load current nmlkj

3. DC to AC and control relatively high load current nmlkj

4. AC to DC and control relatively low load current nmlkj

1. to provide for extra insulation between the cord and the metal case. nmlkj

2. to maintain the flexibility of the cord. nmlkj

3. to prevent the cord from being pulled out of the appliance. nmlkj

4. to reduce the severity of a potential electric shock. nmlkj

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476.As shown in the illustration, "S" is the

Maximizeaza

477.Component "B" of section "I" shown in the illustration represents a

Maximizeaza

1. an electromagnet used to switch contacts. nmlkj

2. an electromagnet used to operate motors. nmlkj

3. an electronic circuit used to control motors. nmlkj

4. a device designed to relay information. nmlkj

1. safety switch nmlkj

2. overload trip nmlkj

3. start button nmlkj

4. stop button nmlkj

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478.For an electromechanical relay, the amount of voltage and current required to energize the relay coil is:

479.Humming or buzzing of electric contacts is a symptom of

480.If a magnetic controller relay fails to drop out when the coil voltage is removed from the relay, the probable cause may be

1. bridge rectifier nmlkj

2. selsyn motor nmlkj

3. small generator nmlkj

4. shielded lamp nmlkj

1. the same when connected on an AC or a DC source. nmlkj

2. the same as the voltage and current ratings of the contacts. nmlkj

3. more than what is required to de-energize the coil nmlkj

4. less than what is required to de-energize the coil. nmlkj

1. low voltage on the operating coil nmlkj

2. power failure to the operating coil nmlkj

3. a control circuit ground nmlkj

4. a control circuit overload nmlkj

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481.If deck machinery is expected to be idle for an extended period of time you should

482.If the approximate voltage to be measured in a circuit is not known, you should

483.In the pitch control diagram shown in the illustration, what are the present plant operating conditions?

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1. excessive spring tension nmlkj

2. overvoltage nmlkj

3. excessive current nmlkj

4. welded contacts nmlkj

1. have electrical safety gloves available in case of electrical shock before running

nmlkj

2. perform a 'high pot' test to determine the condition of the insulation nmlkj

3. water wash the motor and controller to remove any salt that may interfere with smooth operation

nmlkj

4. check run at regular intervals to insure correct operation and to renew the internal coating of lubrication

nmlkj

1. use the lowest voltage range on the voltmeter nmlkj

2. connect the meter in series with the circuit nmlkj

3. only have to calibrate the meter before using it nmlkj

4. use the highest voltage range on the voltmeter nmlkj

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484.Magnetic controller contacts may become welded together during operating conditions as a result of

485.Motor drive systems are used:

1. One engine is on the line, cruise mode is selected and the engine room is in control.

nmlkj

2. One engine is on the line, maneuvering mode is selected and the bridge is in control.

nmlkj

3. Both engines are on line, cruise mode is selected and the bridge is in control.

nmlkj

4. Both engines are on line, maneuvering mode is selected and the engine room is in control.

nmlkj

1. high spring pressure nmlkj

2. high ambient temperature nmlkj


4. low voltage on operating coil nmlkj

1. with AC or DC motors. nmlkj

2. when operator-controlled variance of speed is required. nmlkj

3. to maintain steady motor speed in spite of load fluctuations. nmlkj


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486.On tank vessels with an electrically-driven capstan, the motor should be meggered periodically to test

487.Power necessary to operate the horn shown in the illustration

Maximizeaza

488.Relays are primarily used to switch currents in the:

1. insulation resistance nmlkj

2. eddy currents nmlkj


4. armature reactance nmlkj

1. comes from each station's magneto nmlkj

2. is supplied from a 115 volt source nmlkj

3. is conducted through a relay coil nmlkj

4. also lights lamps "R" and "T" nmlkj

1. control circuit. nmlkj

2. load circuit. nmlkj

3. power-distribution circuit. nmlkj

4. live circuit. nmlkj

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489.Relays with no contacts, which are switched entirely by electronic devices, are called:

490.The best way to test an incandescent lamp filament is:

491.The current drawn by a motor is:

492.The diagrams shown in the illustration represent a/an

Maximizeaza

1. electromechanical relays. nmlkj

2. solid-state relays. nmlkj

3. hybrid relays. nmlkj

4. magnetic relays. nmlkj

1. to shake it. nmlkj

2. to check it for continuity with an ohmmeter. nmlkj

3. to check it for voltage with a voltmeter. nmlkj

4. to visually inspect it. nmlkj

1. low on starting. nmlkj

2. high on starting. nmlkj

3. an accurate measurement of motor load. nmlkj

4. both b and c nmlkj

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493.The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from

494.The electrical energy necessary to transmit a person's voice over a sound-powered telephone circuit is obtained from

495.The fluorescent bulb produces light by:

1. engine order telegraph circuit nmlkj

2. rudder angle indicator arrangement nmlkj

3. engine speed tachometer with repeaters nmlkj

4. sound powered telephone system nmlkj

1. the emergency batteries for the general alarm nmlkj

2. each station's hand-cranked generator nmlkj

3. the emergency switchboard nmlkj

4. normal 115 volt DC supplies nmlkj

1. dry cell batteries nmlkj

2. the ship's service switchboard nmlkj

3. the emergency switchboard nmlkj

4. the speaker's voice nmlkj

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496.The illustrated EL-0024 circuits are used to measure

Maximizeaza

497.The instant-start fluorescent tube:

498.The 'pitch controller module' shown in the illustration is fed the actual pitch position of the propeller from the

1. heating a filament to a white-heat temperature. nmlkj

2. means of a chemical reaction within the tube. nmlkj

3. means of an electron arc established between two cathodes. nmlkj

4. means of magnet induction between two electrodes. nmlkj

1. resistance nmlkj

2. gauss or magnetic field strength nmlkj

3. battery discharge rate in Amp-hours nmlkj


1. has a single-pin connection at each end. nmlkj

2. requires a very high starting voltage. nmlkj

3. requires a bulkier and more expensive type of ballast. nmlkj


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Maximizeaza

499.The pitting of controller contacts can be caused by

500.The purpose of a magnetic relay is to

501.The purpose of overload protection on a motor is to protect:

1. 'pitch meter' nmlkj

2. 'pitch feedback potentiometer' nmlkj

3. #5 relay position nmlkj

4. pitch error signal nmlkj

1. excessive spring pressure nmlkj

2. insufficient contact pressure nmlkj

3. continuous motor overload nmlkj


1. open a circuit only in the event of overload nmlkj

2. remotely open and close contacts nmlkj

3. provide overcurrent protection during starting nmlkj

4. relay voltages at increased power nmlkj

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502.The resistance of a 200-W, 120-V incandescent lamp would be:

503.The schematic diagram shown in the illustration EL-0069 represents which of the listed solid-state circuits?

Maximizeaza

504.The shipboard general alarm system must receive its main source of power from

1. the motor from sustained overcurrents. nmlkj

2. the wire from high currents. nmlkj

3. the motor from sustained over voltage. nmlkj

4. the motor from short circuits. nmlkj

1. higher than that of a 40-W, 120-V incandescent lamp. nmlkj

2. lower than that of a 40-W, 120-V incandescent lamp. nmlkj

3. the same as that of a 40-W, 120-V incandescent lamp. nmlkj

4. 1,66 Ohmi nmlkj

1. Bridge rectifier nmlkj

2. Magnetic amplifier nmlkj

3. Flip-flop generator nmlkj

4. Cathodic amplifier nmlkj

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505.The timer element of a reverse power relay cannot be energized unless

506.The transmit and receive elements of a sound-powered telephone handset are

507.The use of four diodes, in a full-wave bridge rectifier circuit, will

508.What are the plant conditions existing in the 'engine speed control' diagram shown in the illustration?

Maximizeaza

1. a storage battery nmlkj

2. the emergency generator nmlkj

3. an auxiliary generator nmlkj

4. the ship's service generator nmlkj

1. the power flow is the same as the tripping direction nmlkj

2. the power flow is the opposite to the tripping direction nmlkj

3. the movement of the disk is damped by a permanent magnet nmlkj

4. one generator is motorized nmlkj

1. identical and can be used for either function nmlkj

2. of similar construction but different enough to be used only for its own function

nmlkj

3. of very different construction and MUST be used only for its own function

nmlkj

4. constructed so that each can fit only in its own recess nmlkj

1. provide unidirectional current to the load nmlkj

2. allow a very high leakage current from the load nmlkj

3. convert direct current to alternating current nmlkj

4. offer high opposition to current in two directions nmlkj

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509.When attempting to measure AC current with the device shown and you are unsure of the range, the range switch should be set to

Maximizeaza

1. The Bridge is in control in the 'auto. maneuver' mode. nmlkj

2. The Engine Room is in control in the 'cruise split' mode. nmlkj

3. The Bridge is in control in the 'auto. split' mode. nmlkj

4. The Engine Room is in control in the 'auto. maneuver' mode. nmlkj

1. 10 MA / AMPS with leads in the (-10 A) and (+10 A) jacks nmlkj

2. 10 MA / AMPS with leads in the (-COMMON) and (+) jacks nmlkj

3. 10 MA / AMPS with leads in the (-COMMON) and (+10 A) jacks nmlkj

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510.Which of the following applies to stopping a motor by electronically reversing the motor while it is still running in the forward direction?

511.Which of the following devices are protected from being motorized by a reverse-power relay?

512.Which of the following is designed to provide machine operation protection by requiring the motor to be restarted after a power failure?

513.Which of the following is not a characteristic of AC motors?

4. unable to accurately measure AC current with this device as illustrated nmlkj

1. dynamic braking nmlkj

2. regenerative braking nmlkj

3. plugging nmlkj

4. jogging nmlkj

1. Alternators nmlkj

2. Wave guides nmlkj

3. Exciters nmlkj

4. Amplidynes nmlkj

1. phase-reversal protection nmlkj

2. ground-fault protection nmlkj

3. low-voltage protection nmlkj

4. low-voltage release nmlkj

1. high torque at low speed nmlkj

2. lower cost nmlkj

3. less maintenance required nmlkj

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514.Which of the following is not a common application for a relay?

515.Which of the following is not an advantage of fluorescent lamps over the incandescent types?

516.Which of the following is not an advantage of high-intensity discharge lamps?

517.Which of the following statements concerning the maintenance of solid-silver contacts in relays and auxiliary control circuits is correct?

4. physically smaller than DC motors of the same horsepower nmlkj

1. change alternating current to direct current nmlkj

2. control a 120-V lighting circuit with a 24-V control circuit nmlkj

3. control several switching operations by a single separate current nmlkj

4. switch a high-current motor circuit ON and OFF with a low current control circuit

nmlkj

1. lower initial cost nmlkj

2. produce less heat during normal operation nmlkj

3. produce more light per watt of power consumed nmlkj

4. will last longer nmlkj

1. They operate at low current. nmlkj

2. They have a very long life expectancy. nmlkj

3. They have a high light efficiency. nmlkj

4. They have a high watt output from a single fixture. nmlkj

1. When necessary, they should always be dressed with a wire wheel. nmlkj

2. They should be filed with a fine-cut file when projections extend beyond the contact surface.

nmlkj

3. When black silver oxide is present, it should always be removed from the contact surface with coarse sandpaper.

nmlkj

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518.Which of the following statements represents an application of a silicon controlled rectifier?

519.Which of the following statements represents the important factor that must be considered when replacing a faulty diode in the exciter rectifier assembly?

520.Which of the following statements represents the main difference between a relay and a contactor?

521.Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?

4. If necessary, they should be held together with moderate pressure while emery paper is drawn between the contacts.

nmlkj

1. To provide DC power for a main propulsion motor. nmlkj

2. For use as a voltage reference diode. nmlkj

3. For sensing flame in an automated burner. nmlkj

4. To eliminate power supply hum. nmlkj

1. Be certain that the replacement diode is the same polarity as the one removed.

nmlkj

2. Never alter the diode alignment to cause a change in the neutral plane. nmlkj

3. Replacement of a diode also requires balancing of the rotor with a one-piece rotor lamination to be shrunk fit and keyed to the shaft.

nmlkj

4. The replacement diode must be dipped in varnish prior to installation to protect against humidity.

nmlkj

1. Contactors control current and relays control voltage. nmlkj

2. A relay is series connected and a contactor is parallel connected. nmlkj

3. Contactors can handle heavier loads than relays. nmlkj

4. Contactors are made from silver and relays are made from copper. nmlkj

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522.Which of the listed precautions should be observed before spraying liquid solvent on the insulation of an electric motor?

523.Which of the motors for the devices listed below is fitted with an instantaneous overload relay?

524.Which of the referenced waveshapes would appear at point "X" of the circuit shown in the illustration?

Maximizeaza

1. Additional heat sinks will be required nmlkj

2. Conductivity will increase nmlkj

3. Conductivity will decrease nmlkj

4. Resistivity will increase nmlkj

1. Slow the motor down to low speed. nmlkj

2. Disconnect the motor from the power source. nmlkj

3. Secure all ventilation in the area. nmlkj

4. Preheat the insulation to assist in cleaning. nmlkj

1. Fan nmlkj

2. Pump nmlkj

3. Winch nmlkj

4. Machine tool nmlkj

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525.Which of the wave forms shown in the illustration will be produced when the circuit is in use?

Maximizeaza

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

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526.A circuit breaker and a fuse have a basic similarity in that they both

527.A circuit breaker differs from a fuse in that a circuit breaker

528.A circuit is protected from overheating by a/an

529.A delayed-action fuse is most frequently used in which of the listed circuits?

530.A four-pole induction motor, operating on three-phase 60 cycle current will operate at approximately

4. D nmlkj

1. can be reset to energize the circuit nmlkj

2. should open the circuit when overloaded nmlkj

3. will burn out when an over current flow develops nmlkj


1. melts and must be replaced nmlkj

2. is enclosed in a tube of insulating material with metal ferrules at each end nmlkj

3. gives no visual indication of having opened the circuit nmlkj

4. trips to break the circuit and may be reset nmlkj

1. pyrometer nmlkj

2. thermal overload relay nmlkj

3. magnetic contactor nmlkj

4. overload transformer nmlkj

1. Lighting circuit nmlkj

2. Motor circuit nmlkj

3. Electric heater circuit nmlkj

4. Radar circuit nmlkj

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531.A low voltage source is being used for testing armature coils A coil short circuit will be indicated by a

532.A shore power circuit breaker should be closed only

533.A single-phase induction motor will only start if you spin the rotor rapidly with the line switch closed After starting, its speed fluctuates between very slow and half-speed The problem probably lies in the

534.A three-phase, induction-type motor experiences an open in one phase Which of the listed automatic protective devices will prevent the machine from being damaged?

1. 850 RPM nmlkj

2. 1,150 RPM nmlkj

3. 1,750 RPM nmlkj

4. 3,550 RPM nmlkj

1. high voltage reading, while the other coil readings will have an equal or lower value

nmlkj

2. low or zero voltage reading, while the other coils will have higher readings

nmlkj

3. fluctuating voltmeter reading, while the other coil readings are steady nmlkj

4. steady voltmeter reading, while the other coil readings are fluctuating nmlkj

1. when the ship's generators have been directly paralleled to those on shore nmlkj

2. in a shipyard nmlkj

3. if a quick disconnect coupling is used nmlkj

4. when the ship's generators have been removed from the bus nmlkj

1. starting winding nmlkj

2. centrifugal mechanism nmlkj

3. centrifugal switch nmlkj

4. running winding nmlkj

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535.A three-phase, squirrel cage, induction motor will run hot due to

536.AC circuits possess characteristics of resistance, inductance, and capacitance The capacitive reactance of a circuit is expressed in

537.An adjustable resistor, whose resistance can be changed without opening the circuit in which it is connected, is called a

538.An electric heating element supplied with 120 volts draws 15 amps How much power will be consumed?

1. Overspeed trip nmlkj

2. Thermal overload relay nmlkj

3. Three-pole safety switch nmlkj

4. Magnetic blowout coil nmlkj

1. open stator coils nmlkj

2. high power factor nmlkj

3. dirty or corroded slip rings nmlkj

4. reversed commutating poles nmlkj

1. ohms nmlkj

2. mhos nmlkj

3. henrys nmlkj

4. farads nmlkj

1. bleeder resistor nmlkj

2. rheostat nmlkj

3. bridge nmlkj

4. variable shunt strip nmlkj

1. 15 watts nmlkj

2. 45.57 watts nmlkj

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539.An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a

540.An electrical device which prevents an action from occurring until all other required conditions are met is called a/an

541.As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to

542.As shown in the illustration, what happens when "A" is closed, "B" is in position "2" and component 'E2' burns out?

Maximizeaza

3. 180 watts nmlkj

4. 1800 watts nmlkj

1. magnetic amplifier nmlkj

2. ship's service alternator nmlkj

3. three-wire DC generator nmlkj

4. saturable core reactor nmlkj

1. limit nmlkj

2. monitor nmlkj

3. modulator nmlkj

4. interlock nmlkj

1. draw a one line diagram of the circuitry nmlkj

2. test all fuses and measure the line voltage nmlkj

3. take megger readings nmlkj

4. insulate the apparatus from ground nmlkj

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543.Before working on an electric cargo winch master switch or controller, you should

544.During start-up of the circuit shown in the illustration EL-0081, it is noted that the ends of component "C" alternately glow and become dark without the tube illuminating The most probable cause for this is that

Maximizeaza

1. "H" energizes and "D" makes contact. nmlkj

2. "F" goes out allowing "G" to disconnect. nmlkj

3. "G" sounds an alarm and "F" illuminates. nmlkj

4. "C" opens causing "A" to also open. nmlkj

1. spray the gasket surface with a solvent nmlkj

2. drain condensate from the box nmlkj

3. open the circuit breaker in the power supply and tag nmlkj

4. heat the switch box to remove any moisture nmlkj

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545.Electric strip heaters are used in motor controllers to

546.Electrical circuits are protected against overheating by means of a/an

1. component "D" is loose and due to the ship's vibrations makes and breaks contact

nmlkj

2. the power system's voltage is fluctuating in and out of the range necessary for proper operation

nmlkj

3. component "A" is shorted and therefore unable to produce the high voltage required to start the lamp

nmlkj

4. component "B" contacts are opening and closing thus prohibiting sufficient current flow

nmlkj

1. prevent freezing of movable contacts nmlkj

2. keep the components at their design ambient temperature nmlkj

3. prevent condensation of moisture nmlkj

4. minimize resistance in internal circuits nmlkj


2. amplifier nmlkj

3. diode nmlkj

4. capacitor nmlkj

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547.Electrical leads and insulation on a motor should be painted with

548.Excessive heat in an operating motor controller can result from

549.Excessive humming of AC contactors may be caused by

550.Heat sinks are frequently used with

551.If power were lost to the winch shown in the illustration while in 'second point hoist' the winch would stop When power is restored the winch would

Maximizeaza

1. heat-resisting acrylic nmlkj

2. heat-resisting aluminum nmlkj

3. insulating varnish nmlkj

4. insulating white lead nmlkj

1. a closed starter contact nmlkj

2. loose connections nmlkj

3. missing arc chutes nmlkj

4. low motor starting torque nmlkj

1. burnt arc shields nmlkj

2. shorted armature coils nmlkj

3. a broken shading coil nmlkj

4. high voltage nmlkj

1. power transistors nmlkj

2. vacuum tubes nmlkj

3. tunnel rectifier diodes nmlkj


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552.If the illustrated EL-0027 test is being performed to determine which winding is grounded and the light does not come on then

Maximizeaza

1. continue to run at 'second point hoist' unless a different speed is selected by the 'master Switch'

nmlkj

2. continue to run but at 'first point' speed, for safety, until the 'master Switch' is brought to 'off' and then back to the desired speed

nmlkj

3. remain stopped until the 'safety switch' is recycled either directly or by action of the 'master switch' handle

nmlkj

4. remain stopped until the 'master switch' is returned to 'off' closing the 'reset' contacts and then moved to any 'run' position

nmlkj

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553.In a three-phase, squirrel-cage type, induction motor the rotating magnetic field is established by the

554.In an emergency, the fastest way to interrupt power and stop the winch shown in the illustration is for the

Maximizeaza

1. winding is grounded and you should continue on to the next winding to see if any others are grounded

nmlkj

2. winding is not grounded and you should continue on to the next winding until the light comes on designating that winding as grounded

nmlkj

3. test is meaningless because you can not determine if a winding is grounded without a megger.

nmlkj

4. ground is not in the windings but probabily in the pecker head, you should check and retape the line lead connections

nmlkj

1. current induced in the rotor windings nmlkj

2. application of a three-phase voltage supply to the stator windings nmlkj

3. laminated steel core and aluminum conductors in the rotor nmlkj

4. interaction of the magnetic field caused by the induced current in the squirrel-cage bars with the magnetic field of the stator

nmlkj

1. mate to open the disconnect switch at 'L1' and 'L2' nmlkj

2. winch operator to open the 'safe switch' at the 'master switch' nmlkj

3. engine room watch engineer to open the winch circuit breaker nmlkj

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555.In an induction motor, rotor currents are circulated in the rotor by

556.In general, polyphase induction motors can be started on full line voltage by means of

557.In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by

558.Incandescent lamps are classified according to

559.Magnetic controller contacts may become welded together during operation due to

4. electrician to open the test link at the controller nmlkj

1. slip rings and brushes nmlkj

2. an armature and brushes nmlkj

3. inductive reaction of the rotating stator field nmlkj

4. external variable resistors nmlkj

1. compensator starters nmlkj

2. autotransformer starters nmlkj

3. across-the-line starters nmlkj

4. primary-resistor starters nmlkj

1. a manual override switch nmlkj

2. the weight of the load on the boom nmlkj

3. a spring set brake nmlkj

4. a hand operated band brake nmlkj

1. shape of bulb and type of service nmlkj

2. size and style of base nmlkj

3. operating voltage and wattage nmlkj


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560.Most three-phase induction motors used for driving engine room auxiliaries are started by

561.Motor controllers are seldom troubled with grounds because

562.Section III of the circuit shown in the illustration is a

Maximizeaza


2. low contact pressure nmlkj

3. excessive ambient temperature nmlkj

4. excessive magnetic gap nmlkj

1. resistor starters nmlkj

2. across-the-line starters nmlkj

3. impedance starters nmlkj

4. reactor starters nmlkj

1. the auxiliary contacts have a high resistance connection nmlkj

2. the contactors and relays are mounted on a nonconducting panel nmlkj

3. the resistor banks are composed of individual series-connected units nmlkj

4. there are separate switches for the motor and the control nmlkj

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563.Some large AC motors are equipped with with heaters These could be I resistance heaters bolted directly to the frame II low voltage windings embedded in the motor windings

564.The air gap in an induction motor should be periodically checked with a feeler gage to prevent possible

565.The alarm system for an engine order telegraph uses small selsyn motors attached to the indicators The alarm sounds when the rotors are

566.The devices marked "T" in the illustration are

Maximizeaza


2. filter nmlkj

3. rectifier nmlkj

4. voltage transformer nmlkj

1. I only nmlkj

2. II only nmlkj

3. either I or II nmlkj


1. rotor contact with the stator nmlkj

2. axial misalignment of the rotor nmlkj

3. damage to the motor bearings nmlkj

4. electrical damage to the bearings nmlkj

1. in synchronous position, no current is flowing, and the relays are open nmlkj

2. in synchronous position, no current is flowing, and the relays are closed nmlkj

3. not synchronized, current is flowing, and the relays are open nmlkj

4. not synchronized, current is flowing, and the relays are closed nmlkj

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567.The difference between the synchronous speed of an induction machine and its operating speed (slip) may be correctly expressed

568.The first requirement for logical troubleshooting of any system is the ability to

1. trouble alarm units whose contacts activate when problems arise either on starting or stopping of the motor

nmlkj

2. topping lift direction indicators which show alternately whether the motor is hoisting or lowering the load

nmlkj

3. timing relay components whose contacts open or close depending on the setting of their pneumatic adjustment

nmlkj

4. thawing contactor parts whose contacts start and stop the defrosting cycle of the compressor driven by the motor

nmlkj

1. as a percent of synchronous speed nmlkj

2. as a decimal fraction of synchronous speed nmlkj

3. directly in revolutions per minute nmlkj

4. as all of the above nmlkj

1. collect all available data on a casualty nmlkj

2. recognize normal operation nmlkj

3. identify the probable cause of a symptom nmlkj

4. isolate the faulty component nmlkj

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569.The heaters for the winch circuit shown in the illustration are powered from

Maximizeaza

570.The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as

571.The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as

1. a separate source nmlkj

2. the winch main bus nmlkj

3. the master switch power circuit nmlkj

4. the contactor control circuit nmlkj

1. line droop nmlkj

2. line loss nmlkj

3. IR drop nmlkj

4. hysteresis nmlkj

1. line droop nmlkj

2. line loss nmlkj

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572.The process, whereby electrons gain sufficient energy to be released from the surface of a thin, heated metal plate, is known as

573.The purpose of a heat sink, as frequently used with transistors, is to

574.The purpose of 'R6' in the winch circuit shown in the illustration is to

Maximizeaza

3. IR drop nmlkj

4. hysteresis nmlkj

1. photo electric emission nmlkj

2. secondary emission nmlkj


4. regressive emission nmlkj

1. prevent excessive temperature rise nmlkj

2. compensate for excessive doping nmlkj

3. increase the reverse current nmlkj

4. decrease the forward current nmlkj

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575.The purpose of the 'heater resistors' for the winch circuit shown in the illustration is to

Maximizeaza

576.The rate at which heat is produced in a direct current circuit is equal to

1. maintain dry conditions within the winch brake box nmlkj

2. keep the series field current at a low value during 'fourth and fifth point lowering'

nmlkj

3. act as the armature dynamic braking load to assist the winch in stopping nmlkj

4. limit the armature current during lowering operation with heavy loads nmlkj

1. limit the current in the heater circuit nmlkj

2. dispel moisture in the 'master switch' housing & control panel nmlkj

3. keep the winch brake housing below the dew point nmlkj

4. maintain winch motor operating temperature nmlkj

1. P divided by R nmlkj

2. I squared times R nmlkj

3. E divided by I nmlkj

4. I times R divided by T nmlkj

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577.The rated temperature rise of an electric motor is the

578.The 'reset' contacts of the master switch shown in the illustration provides the winch controller with

Maximizeaza

579.The reversal of an AC, three-phase, induction motor is accomplished by

1. average temperature at any given latitude nmlkj

2. normal temperature rise above the standard ambient temperature at rated load

nmlkj

3. average temperature rise due to resistance at 10% overload nmlkj

4. permissible difference in the ambient temperature of the motor due to existing weather conditions

nmlkj

1. low voltage release nmlkj

2. overload protection nmlkj

3. low voltage protection nmlkj

4. high power factor correction nmlkj

1. changing all three motor leads nmlkj

2. reversing the position of the slip rings nmlkj

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580.The rotation of a three-phase induction motor can be reversed by

581.The speed of a multi-speed, squirrel-cage, induction motor operating in a fixed frequency system can be changed by

582.The speed of a squirrel-cage induction motor is determined by the

583.The speed of a three-phase squirrel-cage induction-type motor operating in a fixed frequency system is varied by changing the

584.The synchronous speed of an induction motor is the

3. interchanging any two of the three motor leads nmlkj

4. interchanging any two brushes nmlkj

1. interchanging any two of the three line leads to the stator nmlkj

2. disconnecting one of the three line leads to the stator nmlkj

3. switching the shunt field coil leads nmlkj

4. permanently disconnecting any two of the three line leads to the stator nmlkj

1. reconnecting stator windings for different numbers of poles nmlkj

2. changing the RPM of the rotor flux nmlkj

3. changing the phase sequence of the applied voltage nmlkj

4. reconnecting the stator so that no poles have the same polarity nmlkj

1. diameter of the stator nmlkj

2. number of stator poles nmlkj

3. rotor winding resistance nmlkj

4. rotor conducting bars resistance nmlkj

1. number of phases to the motor nmlkj

2. number of stator poles nmlkj

3. locked rotor current nmlkj

4. resistance of the rotor winding nmlkj

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585.The torque produced by a motor when its shaft will not turn, even though rated voltage is applied to the stator, is known as

586.The winch shown in the illustration operates in any of the positions with the master switch in the 'lower' direction, but will not 'hoist' in any of the master switch hoist positions Which of the listed faults could be the cause?

Maximizeaza

1. speed at which the rotor turns nmlkj

2. speed of the rotating field nmlkj

3. frequency of the rotor current nmlkj

4. slip in per cent of rotor RPM nmlkj

1. locked-rotor torque nmlkj

2. pullout torque nmlkj

3. breakdown torque nmlkj

4. torque margin nmlkj

1. Master switch contact 'MS3' may have defective springs. nmlkj

2. Contactor '3M' coil could have an open winding. nmlkj

3. Contact '2M' in the power circuit may be badly corroded. nmlkj

4. Series relay 'FR' may be open. nmlkj

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587.The winch shown in the illustration will not operate in any speed in the lowering direction and at an abnormal speed in 'first point hoist' The possible cause is that

Maximizeaza

588.Two contributors of electronic console failures are heat and vibration To combat some of their effects, preventive maintenance procedures should include

589.Under normal conditions, the speed of a two-speed squirrel cage induction motor is changed by varying the

1. contactor coil '3M' has many shorted turns nmlkj

2. resistor 'R8-A2' has an open nmlkj

3. contacts '1M' in the power circuit are badly corroded nmlkj

4. master switch contacts 'MS6' have weak springs nmlkj

1. systematic rotation of circuit cards with those from spares to allow component cooling

nmlkj

2. periodic changing or cleaning of console ventilation and control room air conditioning filters

nmlkj

3. weekly tightening of console foundation bolts and changing of the air in the control room

nmlkj


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590.Under which of the listed conditions can the engine room retake the throttle control from the bridge?

591.What is indicated by gradual blackening at the ends of component "C" shown in the illustration?

Maximizeaza

1. frequency of the applied voltage nmlkj

2. resistance in the rotor circuit nmlkj

3. number of field poles nmlkj

4. amplitude of the applied voltage nmlkj

1. Any time it is deemed necessary. nmlkj

2. Only with the master's permission. nmlkj

3. After a 10 minute delay to the input command. nmlkj

4. Only after the throttle has been placed in stop. nmlkj

1. The unit is in danger of exploding. nmlkj

2. The tube is nearing the end of its useful life. nmlkj

3. The circuit voltage is too high. nmlkj

4. The circuit current is too high. nmlkj

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592.What power is consumed by a heating element using a current of 20 amperes at 120 volts?

593.When the control handle is in the 'off' position, the solenoid actuated brake of the electric winch is

594.When the operating handle is in the 'off' position, which master switch contacts for the winch shown in the illustration are closed?

Maximizeaza

1. 20 watts nmlkj

2. 66.67 watts nmlkj

3. 720 watts nmlkj

4. 2400 watts nmlkj

1. de-energized and the brake is released nmlkj

2. energized and the brake is released nmlkj

3. energized and the brake is set by a spring nmlkj

4. de-energized and the brake is set by a spring nmlkj

1. 'MS-DB & OL' nmlkj

2. 'MS-3, 5, 6, 7, & 8' nmlkj

3. 'MS-LVa & OL' nmlkj

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595.When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates

596.Which component of the circuit shown in the illustration is the lamp?

Maximizeaza

597.Which of the damages listed can occur to the components of a winch master control switch, if the cover gasket becomes deteriorated?

4. 'MS-3, 7 & Reset' nmlkj

1. good insulation nmlkj

2. bad insulation nmlkj

3. high insulation power factor nmlkj

4. a high slot discharge factor nmlkj

1. A nmlkj

2. B nmlkj

3. C nmlkj

4. D nmlkj

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598.Which of the following represents the accepted method of cleaning dust and foreign particles from electrical equipment while limiting damage to electric components?

599.Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components?

600.Which of the listed conditions occur when selection is made for 'third point hoist' on the winch shown in the illustration?

Maximizeaza

1. Overheating of the winch motor. nmlkj

2. Contamination of lube oil. nmlkj

3. Sparking at the winch motor brushes. nmlkj

4. Rapid corrosion of switch components. nmlkj

1. Carefully wiping off the components with a soft cotton rag. nmlkj

2. Blowing a high velocity stream of compressed air rapidly across the components.

nmlkj

3. Using a vacuum cleaner to remove debris from the components. nmlkj

4. Using carbon tetrachloride as a cleaning solvent to clean the components. nmlkj

1. Ambient temperature should be as high as possible to drive off moisture. nmlkj

2. Increased ambient temperature decreases the service life of electronic components.

nmlkj

3. Ambient temperature is not significant as long as the relative humidity is kept low.

nmlkj

4. A reduced ambient temperature causes a corresponding reduced service life.

nmlkj

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601.Which two components, shown in the illustration, acting together will disconnect the motor from the line in case of a sustained motor overload?

Maximizeaza

1. Master switch contacts "5", "6", "7", "8", and "9" close. nmlkj

2. Contactors '2M', '3M', '4M' and '1A' pick up. nmlkj

3. Contactors '1M', 3M', '1A' and '2A' drop out. nmlkj

4. Master switch contacts "3","4", "6", "8", and "9" close. nmlkj

1. "G" and "H" nmlkj

2. "E" and "I" nmlkj

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602.Care din consumatori este considerat neesential ?

603.Care dintre urmatorii consumatori de curent continuu (C.C.) se vor gasi pe nave cu sistemele de serviciu in curent alternativ (C.A.)?

604.Care este raportul maxim dintre puterile nominale ale transformatoarelor care functioneaza in paralel?

605.Care este tensiunea maxima de alimentare pentru lampi portabile in locuri periculoase?

3. "F" and "H" nmlkj

4. "E" and "G" nmlkj

1. tabloul instalatiei frigorifice din magazii nmlkj

2. tabloul instalatiei frigorifice al sistemului de stingere cu CO2 de joasa presiune

nmlkj

3. tabloul vinciurilor de manevra nmlkj

4. tabloul instalatiei frigorifice de cambuza nmlkj

1. Iluminatul general nmlkj

2. Iluminatul de urgenta nmlkj

3. Incalzirea cabinelor nmlkj

4. Bucataria nmlkj

1. 2 nmlkj

2. 3 nmlkj

3. 1.5 nmlkj

4. 0.5 nmlkj

1. 60v nmlkj

2. 220v nmlkj

3. 24v nmlkj

4. 48v nmlkj

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606.Pentru ce este important a se cunoaste tensiunea de scurtcircuit a transformatoarelor ?

607.Actionarea detectorului de "nivel minim ulei carter" din cadrul unei instalatii de semnalizare si protectie motor auxiliar va

608.Actionarea detectorului de "supratemperatura gaze evacuare" din cadrul unei instalatii de semnalizare si protectie motor auxiliar va

609.Autonomia iluminatului de urgenta alimentat din baterii de acumulatori, considerat "sursa tranzitorie" este de minim

1. Pentru functionarea corecta in paralel nmlkj

2. Pentru a se calcula raportul de transformare nmlkj

3. Pentru a se calcula regimul termic nominal nmlkj

4. Pentru a se calcula rezistenta de izolatie necesara nmlkj

1. va declansa o alarma optica si acustica, va decupla generatorul de la bare si va opri motorul auxiliar

nmlkj

2. va declansa o alarma optica si acustica nmlkj

3. va declansa o alarma optica si acustica si va porni un alt motor auxiliar nmlkj

4. va declansa o alarma optica si acustica si va reduce turatia motorului auxiliar

nmlkj

1. va declansa o alarma optica si acustica nmlkj

2. va declansa o alarma optica si acustica, va decupla generatorulu de la bare si va opri motorul auxiliar

nmlkj

3. va declansa o alarma optica si acustica si var fii decuplati consumatorii neesentiali

nmlkj

4. va declansa o alarma optica si acustica si va reduce turatia motorului auxiliar

nmlkj

1. 1 ora nmlkj

2. 1/2 ora nmlkj

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610.Autonomia iluminatului de urgenta alimentat din baterii de acumulatori, se considera timpul de functionare astfel incat tensiunea la bornele celui mai indepartat consumator sa nu scada cu mai mult de

611.Blocul de protectie a unui generator sincron asigura minim protectie la

612.Blocul de protectie a unui generator sincron naval se afla instalat in

613.Capacitatea bateriei de acumulatori destinate pornirii diesel-generatorului de avarie (DGA) trebue sa asigure

3. 2 ore nmlkj

4. 3 ore nmlkj

1. 0.01 nmlkj

2. 0.03 nmlkj

3. 0.05 nmlkj

4. 0.01 nmlkj

1. scurtcircuit, suprasarcina, supratemperatura ulei motor auxiliar, tensiune minima, putere inversa

nmlkj

2. scurtcircuit, suprasarcina, presiune minima ulei motor auxiliar, tensiune minima, putere inversa

nmlkj

3. scurtcircuit, suprasarcina, putere inversa nmlkj

4. scurtcircuit, suprasarcina, tensiune minima, putere inversa nmlkj

1. sectia generatorului din TPD nmlkj

2. pe generator nmlkj

3. intr-un tablou dedicat situat in PCC nmlkj

4. intr-n tablou dedicat situat in CM nmlkj

1. 5 porniri nmlkj

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614.Care dintre tipurile de retea este preferata la navele comerciale ?

615.Care este abaterea maxima admisibila a tensiunii nominale ale unui generator sincron independent dotat cu regulator de tensiune?

616.Care este echiparea uzuala a unui Tablou electric de legatura cu malul intr-o centrala electrica navala (CEN) in curent alternativ trifazat (CAT) ?

617.Care este numarul de bare dintr-un teblou principal de distributie (TPD) al unei centrale in Curent Alternativ Trifazat?

2. 9 porniri nmlkj

3. 6 porniri nmlkj

4. 3 porniri nmlkj

1. radiala nmlkj

2. cu magistrale nmlkj

3. mixta nmlkj

4. in bucla nmlkj

1. +/- 3,5% nmlkj

2. +/- 5% nmlkj

3. +/- 2,5% nmlkj

4. +/- 1,5% nmlkj

1. aparat de conectare, aparat de inversare faze, sinfazimetru, voltmetru cu comutator de faze, frecventmetru, ampermetru cu comutator pe faze, KWh

nmlkj

2. aparat de conectare, aparat de inversare faze, sinfazimetru, voltmetru cu comutator de faze, frecventmetru, KWh

nmlkj

3. aparat de conectare, aparat de inversare faze, sinfazimetru, voltmetru cu comutator de faze, KWh

nmlkj

4. aparat de conectare, aparat de inversare faze, voltmetru cu comutator de faze, KWh

nmlkj

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618.Care este numarul de bare dintr-un tablou principal de distributie (TPD) al unei centrale electrice navale in Curent Continuu?

619.Care este tensiune unui element de acumulator acid cu Pb

620.Care este tensiune unui element de acumulator alcalin Fe-Ni

621.Care sunt protectiile minime necesare motorului termic de actionare a generatorului de avarie

1. 2 nmlkj

2. 3 nmlkj

3. 4 nmlkj

4. 5 nmlkj

1. 2 nmlkj

2. 3 nmlkj

3. 4 nmlkj

4. 1 nmlkj

1. 2 V nmlkj

2. 1,5 V nmlkj

3. 2,4 V nmlkj

4. 1,2 V nmlkj

1. 2 V nmlkj

2. 1,5 V nmlkj

3. 2,4 V nmlkj

4. 1,2 V nmlkj

1. presiune minima ungere, temperatura maxima ungere, temperatura maxima racire, supraturatie

nmlkj

2. presiune minima ungere, temperatura maxima racire, supraturatie nmlkj

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622.Ce rol are un corectorul de tensiune din cadrul unui regulator de tensiune inductiv?

623.Conceptual, unde este amplasat tabloul de distributie pentru iluminatul de urgenta ?

624.Conditiile necesare pentru cuplarea unui generator sincron in paralel la barele TPD sunt:

625.Cosfi metru indica:

3. presiune minima ungere, temperatura maxima racire, turatie minima nmlkj

4. presiune minima ungere, temperatura maxima racire, presiune minima racire, supraturatie

nmlkj

1. Asigura o variatie de tensiune de maxim 2,5 % nmlkj

2. Asigura o variatie de frecventa de maxim 5 % nmlkj

3. Asigura o variatie de curent de maxim 10 % nmlkj

4. Asigura o variatie a tensiunii de excitatie de maxim 1,5 % nmlkj

1. In compartimentul masini nmlkj

2. Impreuna cu statia de incarcare nmlkj

3. Impreuna cu acumulatorii nmlkj

4. Pe un culoar la nivelul puntii principale nmlkj

1. egalitatea tensiunilor, egalitatea frecventelor, egalitatea puterilor active, unghi zero intre tensiunile de faza;

nmlkj

2. egalitatea tensiunilor, egalitatea frecventelor, egalitatea puterilor active, unghi zero intre tensiunile de linie;

nmlkj

3. egalitatea tensiunilor, egalitatea frecventelor, aceiasi succesiune a fazelor, unghi zero intre tensiunile de faza;

nmlkj

4. egalitatea tensiunilor, egalitatea frecventelor, aceiasi succesiune a fazelor, unghi zero intre tensiunile de linie;

nmlkj

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626.Cu ce aparate electromagnetice se poate realiza protectia la suprasarcina a unui generator sincron?

627.Cum controlam saptamanal rezistenta de izolatie a iluminatului de urgenta ?

628.Cum se realizeaza decuplarea consumatorilor neesentiali din cadrul unei centrale electrice navale (CEN) in curent alternativ trifazat (CAT)?

629.Cuplarea la barele tablou de distributie de avarie (TDA) a generatorului de avarie nu este conditionata de

1. Raportul dintre puterea reactiva si puterea aparenta nmlkj

2. Raportul dintre puterea activa si puterea aparenta nmlkj

3. Raportul dintre tensiune si curent nmlkj

4. Raportul dintre puterea activa si puterea reactiva nmlkj

1. releu de curent, temporizat nmlkj

2. releu termic, temporizat nmlkj

3. releu de tensiune, netemporizat nmlkj

4. releu de curent, netemporizat nmlkj

1. Cu ajutorul megometrului portabil, separand circuitele nmlkj

2. Nu se controleaza nmlkj

3. De la nivelul tabloul de incarcare/distributie cu aparatele dedicate nmlkj

4. Cu doua voltmetre, intr-un montaj specific nmlkj

1. prin protectia la sub si suprafrecventa la nivelul intrerupatoarelor automate

nmlkj

2. prin protectia la scurtcircuit la nivelul intrerupatoarelor automate nmlkj

3. prin declansatoare ale intrerupatoarelor automate nmlkj

4. prin releele de suprasarcina de la nivelul intrerupatoarelor automate nmlkj

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630.Cuplarea tabloului electric de legatura cu malul la tabloul principal de distributie (TPD) este conditionata de

631.De ce acumulatorii acizi cu Pb este preferat in pornirea cu demaror electric a motoarelor termice ?

632.De ce acumulatorii alcalini sunt preferati in alimentarea circuitelor iluminatului de urgenta ?

633.De ce se prefera ca protectia la scurtcircuit a unei alimentari din tabloul principal de distributie (TPD) din cadrul unei centrale electrice navale (CEN) in curent alternativ trifazat (CAT) sa fie executata atat de intrerupator automat cat si de sigurante fuzibile?

1. existenta tensiunii la barele TPD nmlkj

2. semnalizarea de lansare a CO2 in compartimentul DGA nmlkj

3. actionarea confirmata a protectiei de suprasarcina a DGA nmlkj

4. actionarea protectiei la scurtcircuit pe barele TDA nmlkj

1. starea motorului principal nmlkj

2. starea separatoarelor de bare nmlkj

3. starea intrerupatoarelor de cuplare la bare a generatoarelor nmlkj

4. starea generatorului de avarie nmlkj

1. Deoarece au capacitate mare in raport cu acumulatorii alcalini nmlkj

2. Deoarece pot fii descarcati pana la zero nmlkj

3. Deoarece pot ceda instantaneu curenti mari nmlkj

4. Deoarece au greutate mica in raport cu capacitatea nmlkj

1. Deoarece uzual pot fii complet descarcati nmlkj

2. Deoarece sunt ieftini in raport cu capacitatea nmlkj

3. Deoarece pot ceda instantaneu curenti mari nmlkj

4. Deoarece au greutate mica in raport cu capacitatea nmlkj

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634.Este recomandata functionarea in paralel a unui diesel-generator (DG) si generator pe ax ( G-ax) ?

635.Grupul de avarie trebuie sa functioneze independent minim

636.In cazul iesirii din parametri reglati, blocul de protectie a unui generator sincron naval

637.In cazul iesirii din parametri reglati, blocul de protectie a unui generator sincron naval actioneaza asupra

1. Se poate regla corect nivelul de protectie nmlkj

2. Protectia este sigura, fiind dubla nmlkj

3. Se evita ramanerea in doua faze nmlkj

4. Se realizeaza astfel si protectia la suprasarcina nmlkj

1. Nu - datorita lipsei reactiei intre excitatii nmlkj

2. Nu - datorita caracteristicilor diferite ale regulatoarelor de turatie nmlkj

3. Da - numai pentru transferul sarcinii nmlkj

4. Da - daca puterile nu difera cu mai mult de 1/3 nmlkj

1. 24 ore nmlkj

2. 6 ore nmlkj

3. 12 ore nmlkj

4. 18 ore nmlkj

1. opreste diesel-generatorul nmlkj

2. reduce turatia diesel-generatorului nmlkj

3. decupleza generatorul de la bare si opreste motorul auxiliar nmlkj

4. decupleaza generatorul de la bare nmlkj

1. regulatorului de turatie a motorului de actionare nmlkj

2. intrerupatorului automat de cuplare la bare al generatorului nmlkj

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638.In conditii normale ale unei centrale electrice navale (CEN) in curent alternativ trifazat (CAT) , tabloul de distributie de avarie (TDA) este alimentat direct din

639.La functionarea in paralel a doua generatoare sincrone de puteri egale observam o incarcare de puteri active egala dar o incarcarea de curent de sarcina inegala Acest fapt se datoreaza unui

640.La navele comerciale se prefera o retea radiala deoarece

641.O Centrala Electrica Navala include

3. regulatorului de tensiune al generatorului nmlkj

4. sistemului de pornire al celui de-al doilea generator nmlkj

1. TPD nmlkj

2. DGA nmlkj

3. TM nmlkj

4. nu este alimentat nmlkj

1. reglaj incorect al regulatorului de turatie nmlkj

2. reglaj incorect al regulatorului de tensiune nmlkj

3. defect in bobinajul indusului generatorului nmlkj

4. defect in bobinajul de excitatie al generatorului nmlkj

1. se asigura un consum minim de cablu nmlkj

2. se asigura o dubla alimentare a consumatorilor nmlkj

3. se asigura o buna protectie a consumatorilor nmlkj

4. se asigura o buna selectivitate a protectiilor nmlkj

1. sursele de energie electrica, tabloul principal de distributie si reteaua navei

nmlkj

2. sursele de energie electrica, tabloul principal de distributie si consumatorii

nmlkj

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642.Pe sectiunea din tabloul principal de distributie (TPD) a unui generator sincron din cadrul unei centrale electrice navale (CEN) de curent alternativ trifazat (CAT) vom avea minim urmatoarele aparate de masura:

643.Pentru ca doua generatoare sincrone navale, actionate de motoare auxiliare, sa poata functiona in paralel trebuie ca

644.Pentru ca doua generatoare sincrone navale, actionate de motoare auxiliare, sa poata functiona stabil in paralel, trebuie ca

645.Pot functiona in paralel un diesel-generator (DG) si un turbo-generator ?

3. sursele de energie electrica si tabloul principal de distributie nmlkj

4. sursele de energie electrica, reteaua si consumatorii nmlkj

1. un voltmetru dublu, un frecventmetru dublu, un kilowattmetru, un kilovarmetru, un ampermetru de sarcina, un ampermetru de excitatie

nmlkj

2. un voltmetru dublu, un frecventmetru dublu, un ampermetru de sarcina, un ampermetru de excitatie

nmlkj

3. un voltmetru dublu, un frecventmetru dublu, un kilowattmetru, un ampermetru de sarcina, un ampermetru de excitatie

nmlkj

4. un voltmetru dublu, un frecventmetru dublu, un kilowattmetru, un ampermetru de sarcina

nmlkj

1. sa aiba acelasi putere nmlkj

2. puterile lor sa nu difere mai mult cu 1/3 nmlkj

3. puterile lor sa nu difere mai mult cu 1/2 nmlkj

4. sa fie fabricate de acelasi producator nmlkj

1. parametrii constructivi ai excitatiilor sa fie identici nmlkj

2. puterile lor aparente nominale sa fie egale nmlkj

3. puterile lor active nominale sa fie egale nmlkj

4. sa existe o reactie inversa intre la nivelul regulatoarelor de tensiune nmlkj

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646.Releul de putere inversa:

647.Separatoarele de bare se folosesc la

648.Sincronoscopul este folosit la

649.Sistemul de iluminat de urgenta alimentat din baterii de acumulatori este considerat "sursa tranzitorie"

1. Da - daca sunt indeplinite conditiile de punere in paralel nmlkj

2. Da - daca avem un sincro-repartitor de sarcina nmlkj

3. Da - daca excitatiile se pot lega in paralel nmlkj

4. Da - daca puterile nu difera cu mai mult de 1/2 nmlkj

1. Pastreaza curentul de sarcina la un nivel de siguranta nmlkj

2. Pastreaza tensiunea generatorului la un nivel de siguranta nmlkj

3. Pastreaza puterea generatorului la un nivel de siguranta nmlkj

4. Pastreaza functionarea masinii electrice ca generator nmlkj

1. punerea in paralel a generatoarelor nmlkj

2. separarea pe sectiuni a barelor tabloului principal de distributie nmlkj

3. separarea de avarie a barelor tabloului principal de distributie nmlkj

4. decuplarea in caz de suprasarcina pentru generatoare nmlkj

1. Punerea in paralel a generatoarelor de CA nmlkj

2. Punerea in paralel a generatoarelor de CC nmlkj

3. Sincronizaea functionarii intre motor si generator nmlkj

4. Sincronizarea functionarii a motoarelor generatoarelor nmlkj

1. atunci cand exista si DGA nmlkj

2. atunci cand autonomia acestuia este de minim 6 ore nmlkj

3. atunci cand nu exista DGA nmlkj

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650.Sistemul trifazat cu nul izolat, folosit in centrale electrice navale (CEN) de curent alternativ trifazat (CAT), se justifica prin

651.Un grup diesel-generator (DG) portabil asezat pe punte si cuplat la tabloul principal de distributie (TPD) prin tabloul electric de legatura cu malul pate fi considerat o sursa de energie electrica de avarie ?

652.Uzual, blocul de protectie a unui generator sincron actioneaza asupra intrerupatorului automat de cuplare la bare prin

653.Uzual, un intrerupator automat folosit la cuplarea unui generator sincron la barele TPD, are incorporat urmatoarele protectii:

4. atunci cand DGA nu alimenteaza iluminatul de urgenta nmlkj

1. posibilitatea controlului permanent al rezistentei de izolatie nmlkj

2. incarcarea echilibrata a centralei nmlkj

3. izolarea galvanica a consumatorilor de forta de cei gospodaresti nmlkj

4. folosirea unui numar minim de masini electrice nmlkj

1. Da - pentru ca este o sursa suplimentara ce poate suplinii sursele principale ale centralei electrice

nmlkj

2. Nu - deoarece alimenteza TPD si nu un grup de consumatori dedicati nmlkj

3. Da - deoarece poate porni automat atunci cand cade tensiunea la barele TPD

nmlkj

4. Nu - deoarece alimentarea se face prin tabloul de mal nmlkj

1. bobina electromagnelului de cuplare nmlkj

2. bobina de minima tensiune nmlkj

3. bobina declansatorului nmlkj

4. bobina propie nmlkj

1. scurtcircuit si tensiune minima nmlkj

2. scurtcircuit, suprasarcina si tensiune minima nmlkj

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654.Actionarea motoarelor electrice ale pompelor de combustibil, transfer ulei si separatoare trebuie sa fie dotate cu

655.Alimentarea instalatiilor de automatizare necesare pornirii si functionarii generatorului de avarie se face din

656.Alimentarea sistemului de comanda la distanta a instalatiel de guvernare se face

657.Arzatorul caldarinei asigura:

3. suprasarcina si putere inversa nmlkj

4. tensiune minima si putere inversa nmlkj

1. sisteme de semnalizare a suprasarcinii nmlkj

2. sisteme de deconectare de la distanta nmlkj

3. sisteme de protectie la alimentarea in doua faze nmlkj

4. sisteme de pornire de la distanta nmlkj

1. TPD nmlkj

2. TDA nmlkj

3. bateriile de acumulatori dedicate sau de pornire nmlkj

4. bateriile de acumulatori pentru iluminatul de urgenta nmlkj

1. din TPD direct nmlkj

2. din tablourile din compartimentul carmei, de alimentare ale instalatiei nmlkj

3. din TDA nmlkj

4. din pupitrul de navigatie nmlkj

1. Pulverizarea combustibilului, debitul de aer necesar arderii, initierea aprinderii si controlul flacarei.

nmlkj

2. Pulverizarea combustibilului, initierea aprinderii si protectia la presiune maxima.

nmlkj

3. Pulverizarea combustibilului, aprinderea si protectia la lipsa apa. nmlkj

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658.Dispozitivul auxiliar de actionare a carmei trebuie sa asigure bandarea de la 5° intr-un bord la 5° in celalalt bord in maxim

659.In care din situatiile mentionate, instalatia de protectie si semnalizere MP, declanseaza numai alarma optica si sonora?

660.In care situatiile mentionate, unele instalatii de protectie si semnalizere MP, opreste automat motorului principal ?

661.In care situatiile mentionate, unele instalatii de protectie si semnalizere MP, reduce automat turatia motorului principal ?

4. Toate protectiile caldarinei. nmlkj

1. 30 sec nmlkj

2. 60 sec nmlkj

3. 90 sec nmlkj

4. 120 sec nmlkj

1. Presiunea uleiului de ungere a motorului principal a scazut pana la valoarea minima treapta I-a.

nmlkj

2. Temperatura apei de racire a MP a crescut pana la valoarea maxima treapta a-II a.

nmlkj

3. Temperatura uleiului de ungere a motorului principal a crescut pana la valoarea maxima treapta a-II a.

nmlkj

4. Presiunea uleiului de ungere a reductorului a scazut pana la valoarea minima treapta a-II a.

nmlkj

1. Temperatura uleiului de ungerea motorului principal a ajuns la valoarea maxima , treapta a II a.

nmlkj

2. Temperatura apei de racire a motorului principal a crescut pana la valoarea maxima trepta a II a.

nmlkj

3. Temperatura uleiului de ungere a reductorului a crescut peste limita normala.

nmlkj

4. Presiunea uleiului de ungere a motorului principal a scazut la valoare minima treapta a II-a..

nmlkj

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662.In regim normal de functionare, comanda de oprire a compresorului instalatiei frigorifice este data direct de :

663.La scaderea presiunii uleiului de ungere a motorului principal pana la limita minima treapta I- a, schema de protectie executa:

664.Masina carmei trebuie sa asigure bandarea de la 35° dintr-n bord la 30° in celalalt bord in maxim

665.Motoarele electrice de actionare a carmei trebuie sa suporte timp

1. Temperatura uleiului de ungere a motorului principal a crescut pana la valoarea maxima, treapta a-II-a.

nmlkj

2. Presiunea uleiului de ungere a motorului principal a depasit valoarea maxima.

nmlkj

3. Temperatura uleiului de ungere a motorului principal a crescut pana la valoarea maxima ,treapta I- a.

nmlkj

4. Presiunea uleiului de ungere a reductorului a scazut pana la valoarea minima treapta a I- a.

nmlkj

1. Releul de presiune minima montat pe conducta de aspiratie spre compresor.

nmlkj

2. Termostatele din compartimentele frigorifice. nmlkj

3. Programatorul regimului de degivrare. nmlkj

4. Sistemul de monitorizare al circuitul apei de racire. nmlkj

1. Semnalizarea acustica si optica nmlkj

2. Reducerea automata a turatiei MP nmlkj

3. Marirea presiunii pompei de ungere. nmlkj

4. Oprirea motorului. nmlkj

1. 28 sec nmlkj

2. 14 sec nmlkj

3. 21 sec nmlkj

4. 35 sec nmlkj

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de un minut suprasarcini de

666.Motoarele electrice de forta ale unei masini de carma electrohidraulice au oblogatoriu

667.Motoarele electrice de forta ale unei masini de carma electrohidraulice au protectii la

668.Pe timpul executarii degivrarii in instalatia frigorifica, schema electrica realizeaza:

669.Sistemele de guvernare trebuie sa asigure un numar de

1. 1.2 nmlkj

2. 2 nmlkj

3. 1.5 nmlkj

4. 1.7 nmlkj

1. doua sisteme de alimentare cu energie electrica nmlkj

2. un sistem de alimentare cu energie electrica din TPD nmlkj

3. trei sisteme de alimentare cu energie electrica nmlkj

4. un sistem de alimentare cu energie electrica din TDA nmlkj

1. scurtcircuit si tensiune minima nmlkj

2. scurtcircuit, suprasarcina si tensiune minima nmlkj

3. scurtcircuit nmlkj

4. suprasarcina si tensiune minima nmlkj

1. Blocarea circuitului de aspiratie a compresorului, intreruperea alimentarii termostatelor si intreruperea ventilatiei.

nmlkj

2. Blocarea actiunii protectiei, oprirea compresoarelor si conectarea rezistentelor de incalzire a uleiului

nmlkj

3. Blocarea actiunii protectiei si deconectarea alimentarii compresoarelor si pompei de racire.

nmlkj

4. Intreruperea alimentarii de la reteaua electrica a navei. nmlkj

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670.Ce se va intampla atunci cand bobina tranei electromagnetice a unui vinci de marfa se va arde?

671.Un semiconductor a carui rezistenta electrica descreste odata cu cresterea temperaturii este cunoscut sub numele de

672.Cum se prefera a se realizeaza protectia la suprasarcina a unui motor electric ce actioneaza un vinci de ancora ?

673.Cum sunt notate, in unele standarde, capetele de inceput ale infasurarilor unui motor electric de curent alternativ trifazat (in cutia de borne) ?

1. 200 deplasari ale carmei pe ora nmlkj




1. frana va bloca rotorul sub actiunea resoartelor nmlkj

2. turatia motorului va creste si motorul se va arde nmlkj

3. sarcina din carligul franei va cadea nmlkj

4. nu se va intampla nimic; vinciul va continua sa functioneze ca de obicei nmlkj

1. rezistenta nmlkj

2. termistor nmlkj

3. dioda nmlkj

4. termopila nmlkj

1. prin sigurante fuzibile nmlkj

2. prin sesizori de temperatura introdusi intre infasurarile motorului nmlkj

3. prin relee de tensiune nmlkj

4. prin convectoare nmlkj

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674.Frana electromagnetica a unui motor electric de actionare a vinciului de marfa functioneaza

675.Franarea electromotorului de curent alternativ trifazat (C.A.T.) de actionare a vinciurilor de ancora este realizata prin :

676.In actionarea electrica a vinciului de ancora avem posibilitatea deblocarii manuale progresive a franei electromagnetice Cand folosim scest dispozitiv ?

677.In multe scheme electrice de actionarea a vinciului de ancora,, este un rezistor in paralel cu bobina franei electromagnetice La ce foloseste acest montaj ?

1. A,B,C (1,2,3) nmlkj

2. U,V,W (1,2,3) nmlkj

3. R,S,T (1,2,3) nmlkj

4. X,Y,Z (1,2,3) nmlkj

1. ca frana de rezerva in cazul avarierii franei mecanice manuale nmlkj

2. automat, blocand sarcina in caz de disparitie a tensiunii de alimentare a electomotorului

nmlkj

3. regland automat viteza de coborare a sarcinii nmlkj

4. regland automat viteza de ridicare a sarcinii nmlkj

1. frana dinamica nmlkj

2. frana electromagnetica nmlkj

3. frana electronica nmlkj

4. contracurent. nmlkj

1. cand se deterioreaza bobina franei electromagnetice nmlkj

2. cand dorim sa evitam functionarea in contracurent nmlkj

3. cand dorim sa lansam progresiv ancora nmlkj

4. cand decuplam motorul electric de reductor nmlkj

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678.In actionarea electrica a vinciului de ancora exista posibilitatea anularii immediate a protectiei la suprasarcina. Cum se realizeaza acest luctru?

679.In actionarea electrica a vinciului de ancora se prefera in actionarea franei electromagnetice

680.In cazul actionarii electrice a vinciului de ancora avem posibilitatea opririi instalatiei in caz de pericol printr-n intrerupator de pe controler, care

681.In cazul actionarii electrice a vinciului de ancora pentru a preveni functionarea in contracurent (virare cu ancora "la pic")

1. la adaptarea rezistiva a circuitului bobinei nmlkj

2. la limitarea curentului ce trece prin bobina nmlkj

3. la reglarea tensiunii aplicate bobinei nmlkj

4. la descarcarea tensiunii autoinduse la intreruperea alimentarii bobinei nmlkj

1. nu este permisa o astfel de optiune nmlkj

2. in statia magnetica, prin realizarea unei punti peste releul de protectie nmlkj

3. in statia magnetica, printr-un buton pe releul de protectie la suprasarcina nmlkj

4. pe controler, printr-un buton cu revenire nmlkj

1. o bobina toroidala alimentata in CC nmlkj

2. un sistem de bobine conectate in stea si alimentata in CAT nmlkj

3. o bobina toroidala alimentata in CA nmlkj

4. un sistem de bobine alimentate serie-paralel si alimentate in CA nmlkj

1. decupleaza automatul de alimentare de la nivelul TPD nmlkj

2. decupleaza alimentarea de la nivelul tabloului de actionare nmlkj

3. decupleaza linia de alimentare a contactoarelor de sens nmlkj

4. decupleaza linia de alimentare a releului de tensiune "nula" nmlkj

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682.In cazul aparitiei unei suprasarcini pe trapta a treia a actionarii unui vinci de ancora cu un motor asincron in trei trepte, cu rotorul in scurtcircuit

683.In cazul unei actionari a vinciului de ancora cu un motor asincron in trei trepte, cu rotorul in scurtcircuit, se prefera pentru primele doua trepte o infasurare triundgi-dubla stea. De ce?

684.In cazul unei actionari a vinciului de ancora cu un motor asincron in trepte, cu rotorul in scurtcircuit, frana electromagnetica

685.In cazul unei actionari a vinciului de ancora cu un motor asincron

1. se blocheaza frana barbotinei nmlkj

2. se blocheaza ancora pana dupa pornirea mororului nmlkj

3. se temporizeaza actionarea franei electromagnetice nmlkj

4. se actioneaza manual frana electromagnetica corelat cu pornirea motorului

nmlkj

1. motorul electric trece pe o turatie inferioara de putere sporita nmlkj

2. motorul electric se opreste nmlkj

3. este actionata frana electromagnetica nmlkj

4. motorul electric este dimensionat sa suporte aceasta suprasarcina nmlkj

1. pentru a putea trece de la un regim de turatie la altul fara socuri de curent asupra centralei

nmlkj

2. pentru a putea trece de la un regim de turatie la altul fara a modifica curentul

nmlkj

3. pentru a putea trece de la un regim de turatie la altul fara a modifica cuplul electromagnetic

nmlkj

4. pentru a putea trece de la un regim de turatie la altul fara socuri mecanice nmlkj

1. blocheaza barbotina nmlkj

2. blocheaza rotorul motorului nmlkj

3. decupleaza barbotina de reductorul vinciului nmlkj

4. decupleaza motorul de reductorul vinciului nmlkj

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in trepte, cu rotorul in scurtcircuit, frana electromagnetica este actionata temporizat prin

686.In cazul unei actionari a vinciului de ancora cu un motor asincron in trepte, cu rotorul in scurtcircuit, frana electromagnetica este alimentata printr-un circuit economizor. De ce?

687.In cazul unei actionari a vinciului de ancora cu un motor asincron in trepte, cu rotorul in scurtcircuit, sunt preferate infasurari

688.Instalatia de detectare a incendiului prin prezenta fumului se bazeaza pe :

1. un releu de timp in circuitul ei de alimentare nmlkj

2. intarzierea alimentarii motorului nmlkj

3. marimea intrefierului ei nmlkj

4. un sistem mecanic nmlkj

1. pentru a evita aparitia tensiunilor autoinduse cu valori peste tensiunea de strapungere a izolatiei bobinei

nmlkj

2. pentru a reduce curentul prin bobina dupa ce armatura acesteia afost actionata

nmlkj

3. pentru evitarea strapungerii bobinei la actionari prelungite nmlkj

4. nu exista un astfel de circuit nmlkj

1. stea-triunghi nmlkj

2. triunghi nmlkj

3. stea nmlkj

4. triunghi-dubla stea nmlkj

1. Temperatura fumului nmlkj

2. Continutul chimic al fumului nmlkj

3. Cantitatea de fum nmlkj

4. Opacitatea fumului nmlkj

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689.Intrerupatorul automat din tabloul principal de distributie (TPD) de alimentare a actionarii vinciului de ancora are protectii la

690.O caracteristica ce apare pe placuta indicatoare (eticheta) unui motor de curent alternativ este

691.Oprirea in caz de urgenta a electromotorului de actionare a mecanismului de ridicare a barcii de salvare cu grui se face prin :

692.Oprirea instalatii de guvernare in cazul unei suprasarcini la electromotorul de actionare se face prin:

693.Cum se prefera a se realiza pornirea ventilatoarelor pentru magaziile de marfa?

1. scurtcircuit si lipsa tensiune nmlkj

2. scurtcircuit nmlkj

3. nu are protectie nmlkj

4. scurtcircuit si suprasarcina nmlkj

1. tipul bobinajului nmlkj

2. alunecarea nominala nmlkj

3. temperatura nominala nmlkj

4. cuplul rotoric nominal nmlkj

1. Siguranta fuzibila. nmlkj

2. Releu termic. nmlkj

3. Limitator de capat. nmlkj

4. Intrerupator de avarie. nmlkj

1. Sigurante fuzibile. nmlkj

2. Releu termic. nmlkj

3. Releu de curent. nmlkj

4. Nu se face. nmlkj

of 233


694.Protectia la lipsa-tensiune sau lipsa-operator este realizata la instalatiile de ridicat prin ?

695.Protectia la suprasarcina pentru actionarile electrice ale vinciurilor de ancora se prefera a fi executate cu

696.Rolul controlerului la o instalatie de punte este :

697.Semnalizarea automata de incendiu a fost conceputa pentru a detecta automat, la timp :

1. prin pornire directa. nmlkj

2. prin pornire cu autotransformator. nmlkj

3. prin pornirea stea-triunghi. nmlkj

4. prin variator de frecventa nmlkj

1. interblocaj la pornire nmlkj

2. cu buton de oprire nmlkj

3. sigurante fuzibile nmlkj

4. relee termice nmlkj

1. relee de tensiune nmlkj

2. relee de curent nmlkj

3. termocuple nmlkj

4. termocontacte nmlkj

1. Variatia tensiunii electromotorului de actionare. nmlkj

2. Mentinerea constanta a turatiei. nmlkj

3. Franarea electromotorului nmlkj

4. Comutarea treptelor de viteza. nmlkj

1. Locul unde exisat incendiu. nmlkj

2. Cauza incendiului. nmlkj

of 233


698.In cazul unei actionari a vinciului de ancora cu un motor asincron in trei trepte, cu rotorul in scurtcircuit, treapta (terptele) de lucru sunt considerate a fi :

699.Umiditatea, ca rezultat al condensarii, poate fii redusa, in interiorul unui controler al unui vinci de marfa prin

700.Un generator fara perii este destinat a functiona fara

701.Un indicator electric tahometric primeste semnalul de viteza al unui motor termic de la

3. Metoda de stingere a incendiului. nmlkj

4. Proportia incendiului. nmlkj

1. I + III nmlkj

2. II + III nmlkj

3. I + II nmlkj

4. III nmlkj

1. montarea unui bec cu incandescenta in interiorul acestuia nmlkj

2. etansarea controlerului cu siliconi sau rasini epox nmlkj

3. ventilarea regulata a spatiului interior nmlkj

4. rezistente de incalzire montate in interior nmlkj

1. perii nmlkj

2. inele colectoare nmlkj

3. port-perii nmlkj

4. toate cele nominate nmlkj

1. un mic generator montat pe motorul termic nmlkj

2. un dispozitiv bimetalic montat pe motorul termic nmlkj

3. un sensor stroboscopic montat pe motorul termic nmlkj

of 233


702.Un motor electric de mica putere poate fi pornit cu un pornitor

703.Un shunt ampermetric este conectat in

704.Unde este amplasat intrerupatorul de de urgenta al unui grup barca salvare ?

705.Care este timpul de functionare recomandat al unui motor electric de actionare a unui vinci ancora, pe trapta a I-a?

706.Care sunt protectiile specifice ale vinciului de ancora actionat electric

4. un dispozitiv cu relee "reed" montat pe motorul termic nmlkj

1. cu compensator nmlkj

2. cu autotransformator nmlkj

3. direct nmlkj

4. cu rezistente pe linie nmlkj

1. serie cu sarcina si in paralel cu aparatul de masura nmlkj

2. in paralel cu sarcina si in serie cu aparatul de masura nmlkj

3. in paralel cu sarcina si in paralel cu aparatul de masura nmlkj

4. in serie cu sarcina si in serie cu aparatul de masura nmlkj

1. Pe punte. nmlkj

2. In tabloul de alimentare. nmlkj

3. Pe electromotorul de actionare. nmlkj

4. langa butonul de actionare. nmlkj

1. 10 min nmlkj

2. 20 min nmlkj

3. 30 min nmlkj

4. 40 min nmlkj

of 233


707.Ce reprezinta franarea in contracurent unui motor electric de c.a. ?

708.Cum se poate realizata ventilatia unui motor electric in curent alternativ trifazat (CAT) , care actioneaza un mecanism de punte ?

709.Cum se realizeaza franarea dinamica a unui motor electric de curent alternativ (c.a.) ?

710.Cum se realizeaza inversarea sensului de rotatie la un motor electric asincron trifazat ?

1. scurtcircuit, suprasarcina, tensiune minima, stop de avarie, supratemperatura

nmlkj

2. scurtcircuit, suprasarcina, tensiune minima, lipsa operator, stop de avarie, nmlkj

3. scurtcircuit, suprasarcina, lipsa operator, stop de avarie, nmlkj

4. scurtcircuit, suprasarcina, tensiune minima, lipsa operator, nmlkj

1. franarea prin inversarea sensului de rotatie. nmlkj

2. frana electromagnetica. nmlkj

3. franare in suprasincron. nmlkj

4. alimentarea cu tensiuni simetrice. nmlkj

1. racire cu apa nmlkj

2. opriri dupa un anumit timp de functionare nmlkj

3. dupa temperatura nmlkj

4. cu ventola cuplata la axul motorului nmlkj

1. separarea infasurarilor statorice. nmlkj

2. frana electromagnetica. nmlkj

3. conectarea a doua faze la o sursa de c.c. nmlkj

4. franare manuala nmlkj

of 233


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17. 1. 2. 3. 4.

18. 1. 2. 3. 4.

19. 1. 2. 3. 4.

20. 1. 2. 3. 4.

21. 1. 2. 3. 4.

1. schimbarea a doua faze intre ele. nmlkj

2. schimbarea tutror fazelor intre ele. nmlkj

3. schimbarea uneia dintre faze. nmlkj

4. schimberea sensului de antrenare. nmlkj

nmlkj nmlkji nmlkj nmlkj

nmlkj nmlkj nmlkji nmlkj




nmlkj nmlkj nmlkj nmlkji

nmlkji nmlkj nmlkj nmlkj















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