U.S.C.G. Merchant Marine Exam Assistant Engineer – Limited ......system conductor of which system...

National Maritime Center Serving Our Nation’s Mariners

U.S.C.G. Merchant Marine Exam

Assistant Engineer – Limited

Q615 Electrical Electronics and Control Engineering

(Sample Examination)

of 37 Q615 Electrical Electronics and Control Engineering

8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19

Choose the best answer to the following Multiple Choice Questions.

1. For the purpose of calculating line current, which of the following procedures should be used to determine the total line current of a three-phase, delta wound, AC generator?

o (A) Divide the total amperage in all phases by three. o (B) Divide the total amperage in all phases by the square root of three. o (C) Multiply the amperage in one phase by three. • (D) Multiply the amperage in one phase by the square root of three.

If choice D is selected set score to 1.

2. In a series circuit, what is the applied voltage (or sum of the applied voltages) equal to?

o (A) the total resistance divided by the total current o (B) the total current divided by the total resistance • (C) the sum of the individual voltage drops o (D) the sum of the individual currents multiplied by the number of resistors

If choice C is selected set score to 1.

3. What statement is true concerning the total resistance of a parallel circuit?

o (A) The total resistance is equal to the sum of the individual branch resistances divided by the number of branches.

o (B) The total resistance is larger than that of the branch with the greatest resistance. o (C) The total resistance is equal to the sum of the individual branch resistances. • (D) The total resistance is less than that of the branch with the lowest resistance.


4. In the schematic of the electrical circuit shown in figure "A" of the illustration, assuming that C1 and C2 are equal in capacitance, what is the value of the total capacitance, when compared to the value of equal individual capacitors? Illustration EL-0038

o (A) Half o (B) Equal • (C) Double o (D) Squared



8/21/2019


5. What practice could potentially damage a multimeter?

• (A) placing the test leads across a voltage source to measure voltage while in the resistance mode

o (B) placing the test leads in series with the load of a circuit to measure current while in the voltmeter mode

o (C) placing the test leads across a de-energized and isolated resistance to measure resistance while in the voltmeter mode

o (D) placing the test leads across a de-energized and isolated resistance to measure resistance while in the ammeter mode

If choice A is selected set score to 1.

6. The turns ratio of the tapped step-down transformer shown in figure "C" of the illustration is four to one and all taps are evenly spaced. If 120 volts were applied to terminals "H1" and "H3", what would appear at "X1" and "X2"? Illustration EL-0082

• (A) 15 volts o (B) 30 volts o (C) 480 volts o (D) 960 volts


7. What type of electrical diagram for the electrical distribution system is shown in the illustration? Illustration EL-0014

o (A) The diagram is an isometric diagram. o (B) The diagram is a wiring diagram. o (C) The diagram is a ladder or line diagram (schematic). • (D) The diagram is a one-line diagram.


8. What is an ammeter used to measure?

o (A) resistance o (B) voltage o (C) continuity • (D) current



8/21/2019


9. When configuring a digital multimeter as an ohmmeter, what will MOST likely be displayed on the screen when the test leads are shorted together?

o (A) A reading of "OL" ohms will be displayed. o (B) A reading of residual test lead and internal resistance will be displayed (typically .2 to .5

ohms). o (C) A reading of 0 ohms will be displayed. • (D) B or C could be correct depending upon the digital multimeter.


10. What is the nominal open-circuit cell voltage of one lead-acid storage battery cell?

o (A) 1.2 volts • (B) 2 volts o (C) 6 volts o (D) 12 volts

If choice B is selected set score to 1.

11. Which type of AC single phase motor will also operate on direct current?

o (A) Split phase • (B) Series-wound o (C) Repulsion-start o (D) Shaded-pole


12. What type of AC motor would use a rheostat in the rotor circuit to vary the speed of the motor?

o (A) regenerative braking motor o (B) synchronous motor • (C) wound-rotor induction motor o (D) squirrel-cage induction motor


13. Which of the following is the only known perfect dielectric for the purpose of serving as electrical insulation?

o (A) mica o (B) ceramic • (C) vacuum o (D) glass



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 14. When a battery-operated megohmmeter (insulation tester) is used to perform a dielectric absorption

test, the resistance is measured and recorded from each conductor to ground each minute for 10 consecutive minutes. What condition accounts for a gradual rise in resistance each successive minute?

• (A) The insulation is in good condition. o (B) The insulation is cracked and otherwise deteriorated. o (C) The insulation is contaminated with moisture. o (D) The insulation has direct continuity with ground.


15. As shown in the illustrated diagnostic setup for locating a shorted field coil of a ten-pole synchronous motor, if 240 VAC/60 Hz is applied across the brushes, what would be the individual voltage drops measured across each field coil assuming that none of the field coils are shorted? Illustration EL-0202

o (A) 6 VAC o (B) 12 VAC • (C) 24 VAC o (D) 48 VAC


16. Which of the following devices would be forbidden to use as a primary means of electrical isolation?

o (A) fused disconnect switch o (B) circuit breaker • (C) start/stop push button station o (D) non-fused disconnect switch


17. Contact with any energized electrical system conductor is potentially hazardous and precautions should be taken to prevent exposure. With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect?

o (A) DC systems • (B) 60 Hz AC systems o (C) 10 kHz AC systems o (D) All the above systems would be equally as damaging



8/21/2019


18. If it becomes absolutely necessary to run an alternator at lower than 5% below its rated frequency, in terms of output voltage, what must be done?

o (A) The alternator output voltage must be increased proportionately upward to compensate for the frequency decrease.

o (B) The alternator output voltage must be maintained at the rated value for the alternator output voltage.

• (C) The alternator output voltage must be decreased proportionately downward with the frequency decrease.

o (D) Under no circumstances is it permissible to run an alternator at a frequency lower than 5% below its rated frequency.


19. What can be the cause of excessive heat or burning contacts in an operating motor controller?

• (A) dirty or pitted contacts o (B) low motor starting torque o (C) burned out operating coil o (D) high ambient temperature


20. As the electrolyte level in the cells of a lead-acid battery evaporates over time, what will tend to happen to the specific gravity of the electrolyte in the cells as the level drops due to evaporation?

o (A) The specific gravity of the electrolyte will remain unchanged as both the water and sulfuric acid will evaporate from the electrolyte solution.

• (B) The specific gravity of the electrolyte will increase as only the water will evaporate from the electrolyte solution.

o (C) Although the specific gravity will change due to evaporation, there is no predictable tendency either way.

o (D) The specific gravity of the electrolyte will decrease as only the sulfuric acid will evaporate from the electrolyte solution.


21. How can the loss of residual magnetism in an alternator with a brushless excitation system be corrected?

• (A) using a storage battery or battery charger to "flash" the field o (B) running the generator at normal speed with the field rheostat fully counter-clockwise o (C) running the rotor in the opposite direction for 5 minutes o (D) allowing the generator to run at 10% of normal speed for 5 minutes



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 22. According to 46 CFR Subchapter J, what is true concerning the installation of batteries used for

diesel engine starting?

• (A) be located as close as possible to the engine o (B) be located in a locker on the weather deck o (C) only be of the nickel alkaline type o (D) have sufficient capacity to provide at least 50 starts consecutively without recharging


23. Why are nickel-cadmium batteries superior to lead-acid batteries for standby service?

o (A) NiCad batteries have electrochemical characteristics that allow specific gravity to be used as a convenient means of determining the state of charge

o (B) NiCad batteries use a water-free electrolyte that is not subject to evaporation (even in batteries that are not of the sealed type)

o (C) NiCad batteries need fewer cells connected in series for the same battery bank voltage and require less mounting space

• (D) NiCad batteries are able to hold their charge for long periods of time without recharging due to less local action (open-circuit self-discharge)


24. Which of the illustrated motors has an open, drip-proof (ODP) motor enclosure? Illustration EL-0001

o (A) A o (B) B • (C) C o (D) D


25. How is the difference between the synchronous speed of a three-phase induction motor and its operating speed correctly expressed?

o (A) deviation • (B) slip o (C) a decimal fraction of full load speed o (D) a percent of full load speed



8/21/2019


26. Assuming that a three-phase synchronous motor is separately excited, what statement is true concerning power supplies?

o (A) The rotor windings via slip rings and brushes are connected to a three-phase AC power source, and the stator winding is directly connected to a DC power source.

• (B) The rotor winding via slip rings and brushes is connected to a DC power source, and the stator windings are directly connected to a three-phase AC power source.

o (C) The rotor winding via slip rings and brushes is connected to a single phase AC power source, and the stator winding is directly connected to a three-phase AC power source.

o (D) The rotor winding via slip rings and brushes is connected to a three-phase AC power source, and the stator winding is directly connected to a single phase AC power source.


27. Which of the following statements represents the main difference between an electromagnetic relay and an electromagnetic contactor as used in motor control and power circuits?

o (A) A relay is series connected and a contactor is parallel connected. o (B) Contactors control current and relays control voltage. • (C) Contactor contacts can handle heavier loads than relay contacts. o (D) Contactor contacts are made from silver and relay contacts are made from copper.


28. Which of the following pictures represents a magnetic reversing or two-speed motor starter? Illustration EL-0179

o (A) A o (B) B o (C) C • (D) D


29. What is the name of the device that works in conjunction with an automatic voltage regulator and is used as the source of magnetizing direct current delivered to the rotating field of an AC generator?

o (A) magnetizer o (B) alternator • (C) exciter o (D) governor



8/21/2019


30. In which of the following branch circuits types would time lag fuses (or dual-element fuses) be MOST likely used?

o (A) main lighting circuits • (B) motor starting circuits o (C) emergency lighting circuits o (D) general alarm circuits


31. A thermal-magnetic molded case circuit breaker for a 300 kW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will MOST likely trip the breaker?

o (A) Sustained current draw of 450 amperes indefinitely. o (B) Sustained current draw of 500 amperes for 3 hours. o (C) Momentary current draw of 1000 amperes for 3 seconds. • (D) Instantaneous current draw of 10,000 amperes for .03 seconds.


32. Which of the following pictures shown in the illustration is a control transformer, usually used to step down line voltage for supplying reduced voltage control circuits? Illustration EL-0177

o (A) A • (B) B o (C) C o (D) D


33. The timer element of a reverse power relay cannot be energized unless what condition is met?

• (A) the power flow is the same as the tripping direction o (B) one generator is fully motorized o (C) the power flow is the opposite to the tripping direction o (D) the movement of the disk is damped by a permanent magnet


34. Which of the wave shapes shown in the illustration is termed a sinusoidal wave? Illustration EL-0088

• (A) A o (B) B o (C) C o (D) D



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 35. Which of the substances listed can be used to shield sensitive equipment from static magnetic

fields?

o (A) Mica o (B) Bakelite o (C) Glass • (D) Iron


36. What is the name of the semiconductor device with the essential characteristic that it decreases in resistance with an increase in temperature?

o (A) thermistor with a positive temperature coefficient o (B) resistance temperature detector • (C) thermistor with a negative temperature coefficient o (D) thermocouple


37. What is the functional purpose of the zener diode "CR1" as shown in section "D" of the regulated DC power supply? Illustration EL-0085

o (A) is a temperature compensator • (B) aids in output voltage regulation o (C) prevents excessive currents o (D) corrects power factor


38. How are operational amplifiers, used primarily in analog circuits, characterized?

o (A) low input impedance, low gain and high output impedance • (B) high input impedance, high gain and low output impedance o (C) high input impedance, high gain and high output impedance o (D) low input impedance, high gain and low output impedance


39. In referring to the frequency response filters shown in the illustration, what determines the band pass or band stop frequencies as appropriate? Illustration EL-0078

• (A) The value of the resonant frequencies associated with L and C o (B) The value of the RC time constant o (C) The magnitude of the incoming voltage o (D) The value of the total load resistance



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 40. As shown in all three diagrams included in the illustration, what type of logic circuit is represented?

Illustration EL-0231

o (A) NOR gate o (B) OR gate • (C) XOR gate o (D) NOT gate


41. Referring to figure "2" of the illustration, if the inputs at A and B are both "0", what will be the outputs at "C", "D", "E", and "F" respectively? Illustration EL-0089

o (A) C = 0 D = 1 E = 0 F = 1 o (B) C = 1 D = 0 E = 0 F = 1 • (C) C = 1 D = 1 E = 0 F = 1 o (D) C = 1 D = 1 E = 1 F = 1


42. Which statement is TRUE concerning electric propulsion drives?

o (A) Lack of flexibility of arrangement between the prime mover and motor. • (B) The propeller speed and direction of rotation are easily controllable. o (C) Lower transmission losses compared to other types of propulsion drives. o (D) Inability to be utilized as a source of ships service power.


43. An electric propulsion drive system in which the propulsion generator supplies power to both the propulsion motor and ship service loads is referred to as what type of system?

o (A) a multi-purpose system o (B) a composite system • (C) an integrated system o (D) a dedicated system


44. The propulsion motor most often utilized in an AC drive system operating in the moderate to high power range is of what type?

• (A) synchronous type with wound field o (B) split-phase induction type o (C) squirrel-cage induction type o (D) wound rotor induction type



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 45. By what common means is the speed of an AC propulsion motor on a diesel-electric propulsion ship

controlled?

o (A) by varying the input frequency to the motor, but not the voltage • (B) by varying both the input frequency and voltage to the motor o (C) by varying the input voltage to the motor, but not the frequency o (D) by varying either the input voltage or frequency to the motor, but not both


46. In a podded azimuthing propulsion system, how is three-phase, frequency and voltage controlled power delivered to the synchronous propulsion motor stator windings?

o (A) By the use of commutator bars and brushes. o (B) By direct connection to the stator windings. • (C) By the use of slip rings and brushes. o (D) By rotary transformer action.


47. For the purposes of high voltage marine practice, what is the threshold voltage where all voltages below this value are considered low voltage?

• (A) 1.0 kV o (B) 3.3 kV o (C) 6.6 kV o (D) 11 kV


48. In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to detect a voltage?

o (A) The live-line tester should be checked by connecting to a known high voltage source only after testing the circuit to be worked upon.

• (B) The live-line tester should be checked by connecting to a known high voltage source before and after the circuit to be worked upon is tested.

o (C) The live-line tester should be checked by connecting to a known high voltage source only before testing the circuit to be worked upon.

o (D) The live-line tester need not be checked prior to testing the circuit to be worked upon as long as it has not been declared inoperative.



8/21/2019


49. To facilitate communication between the wheelhouse and the steering gear room in a steering emergency where no external source of power is required, what means of two-way communication would be provided?

o (A) Emergency loudspeaker system o (B) Two-way portable radios • (C) Sound-powered telephone system o (D) Ship-service telephone system


50. Of the following, what shipboard system is MOST likely to use the synchronous transmission system featuring a transmitter and receiver?

• (A) Rudder angle indicator system o (B) Shaft revolution indicator system o (C) Turbocharger RPM indicator system o (D) Centrifuge RPM indicator system


51. Modern ships use multiple computers arranged in a client/server network to perform various shipboard functions. What type of computer network would most likely be used aboard ship?

• (A) Wired local area network o (B) Wireless local area network o (C) Wired wide area network o (D) Wireless wide area network


52. As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "ROS" which are remote operating system workstations? Illustration EL-0096

o (A) The ROS located in the ship's office is designated as the master ROS. o (B) The ROS located in the wheelhouse is designated as the master ROS. o (C) Operator access to control functions among the various ROS locations are all identical. • (D) Operator access to control functions among the various ROS locations differ depending

system configuration and need.



8/21/2019


53. When regreasing the electric motor bearing as shown in figure "B" of the illustration, what practice should be avoided? Illustration EL-0218

o (A) Flushing out the old grease while running the motor with no load. o (B) Flushing out the old grease with an approved solvent. o (C) Only partially filling the bearing cavity with new grease. • (D) Completely filling the bearing cavity with new grease.


54. What would be the indication of a grounded switch or cable as measured by a megohmmeter?

o (A) being unsteady in the high range o (B) infinity • (C) "zero" o (D) being unsteady in the low range


55. Referring to the illustration pertaining to an alternator protection and alarm system, what statement is true concerning the component labeled "LO"? Illustration EL-0067

o (A) LO is an alternator phase loss safety shutdown and alarming device. • (B) LO is an alternator electrical fault trip master lock-out and alarm device. o (C) LO is an alternator prime mover low lube oil pressure safety shutdown and alarming device. o (D) LO is an alternator bearing low lube oil pressure safety shutdown and alarming device.


56. While monitoring an impressed current cathodic hull protection system, which of the following measurements should remain constant in a properly operating electronically regulated system?

o (A) Total anode current o (B) Control amplifier output voltage o (C) Individual anode currents • (D) Reference electrode voltage



8/21/2019


57. Referring to the sound-powered telephone circuit shown in the illustration, what statement is true? Illustration EL-0093

o (A) The sound-powered telephone circuitry consists of a selective-talk circuit and a common-ringing circuit.

o (B) The sound-powered telephone circuitry consists of common-talk and common-ringing circuits. • (C) The sound-powered telephone circuitry consists of a common-talk circuit and a selective-

ringing circuit. o (D) The sound-powered telephone circuitry consists of selective-talk and selective-ringing circuits.


58. In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by what means?

o (A) the weight of the load on the boom • (B) a spring set brake o (C) a hand-operated band brake o (D) a manual override switch


59. Which of the listed conditions occur when selection is made for "third point hoist" on the winch hoist controller shown in the illustration? Illustration EL-0102

• (A) Master switch contacts "2" (unused) and "4","5", and "6" close. o (B) Contactors "H", "1A" and "2A" drop out. o (C) Master switch contacts "4","7", and "8" close. o (D) Contactors "H", "3A", "4A" pick up.


60. Which of the electronic schematic symbols represents the capacitor illustrated in figure "1" of the illustration? Illustration EL-0015

o (A) A • (B) B o (C) C o (D) D



8/21/2019


61. What is the shape of the schematic symbol for an operational amplifier used in an analog circuit?

o (A) square • (B) triangle o (C) trapezoid o (D) circle


62. What should you be aware of when checking the specific gravity of the battery electrolyte with a hydrometer?

o (A) the battery is fully charged when the float sinks deepest into the electrolyte • (B) depending on the temperature it may be necessary to correct for temperature o (C) a hydrometer reading is accurate if taken immediately after water is added to the cell o (D) the battery is discharged when the float is highest in the electrolyte


63. Why must caution be exercised during the charging of flooded lead-acid storage batteries?

o (A) lead peroxide in the negative plate is poisonous o (B) both plates are changing chemically to lead sulfate o (C) the acid will become weaker • (D) hydrogen gas can be liberated during charging


64. Rotor-to-stator air gap readings should be periodically taken for electrical generation equipment. What is the best tool to use to take these measurements?

o (A) cloth (non-metallic) tape measure o (B) inside micrometer o (C) dial indicator • (D) tapered, long blade, feeler gage


65. When an alternator is to remain idle for even a few days, what should be ensured or manually accomplished?

o (A) manually open the equalizing bus disconnect switch as required o (B) insulate the collector rings with strips of cardboard if applicable • (C) ensure energization the space heater circuit (usually automatic) o (D) manually lift the brushes and disconnect the pigtails if applicable



8/21/2019

Q615 Electrical Electronics and Control Engineering U.S.C.G. Merchant Marine Exam Assistant Engineer-Limited Illustrations: 19 66. Which of the following methods should be used to dress the face of silver-plated contacts?

o (A) Knurling with a knurling tool o (B) Filing with a mill file o (C) Burnishing with a burnishing tool • (D) Sanding with 400 grit sandpaper


67. As shown in figure "A" of the illustration, what phenomenon is illustrated with respect to electrical cable conductors and hull ground? Illustration EL-0126

o (A) distributed impedance o (B) distributed reactance o (C) distributed inductance • (D) distributed capacitance


68. Large machines undergoing a resistance insulation testing using a megohmmeter should be discharged to remove any accumulated electrostatic/capacitive/dielectric-absorption charge stored. When should this discharge be performed?

• (A) prior to and after conducting the insulation resistance check o (B) prior to conducting the insulation resistance check only o (C) after conducting the insulation resistance check only o (D) while performing the insulation resistance check only



8/21/2019


69. You are replacing a three-phase induction motor in an application where equipment could bedamaged if the direction of rotation of the motor is incorrect when connected. Assuming that evenmomentarily jogging the motor could damage equipment and that the feeder phase sequence isABC clockwise as tested with a phase sequence indicator, what should then be done to ensure thatthe motor rotation will be correct (clockwise) when connected electrically to the line andmechanically to the load? Assume that the power is off and that the contact-type motor rotationindicator leads are connected to the motor terminals.

o (A) Rotate the shaft by hand in the clockwise direction as viewed from the drive end. With thepush to test pushbutton depressed, if the sequence indicates ABC, phase sequence and motorrotation are NOT in agreement and any two leads must be interchanged.

o (B) Rotate the shaft by hand in the clockwise direction as viewed from the drive end. With thepush to test pushbutton depressed, if the sequence indicates ACB, phase sequence and motorrotation are in agreement and no connection changes are necessary.

o (C) Rotate the shaft by hand in the clockwise direction as viewed from the drive end. With thepush to test pushbutton depressed, if the sequence indicates ACB, phase sequence and motorrotation are NOT in agreement and all three leads must be interchanged.

• (D) Rotate the shaft by hand in the clockwise direction as viewed from the drive end. With thepush to test pushbutton depressed, if the sequence indicates ABC, phase sequence and motorrotation are in agreement and no connection changes are necessary.


70. In the illustration of the one-line distribution system diagram, if at sea the 450 VAC section of themain switchboard experiences a complete loss of power, what statement is true concerning theoperation of the emergency diesel-generator? Illustration EL-0014

o (A) It will automatically start but the automatic bus transfer device must be manually shifted to"Emergency Power" to supply the 450 VAC section of the emergency bus.

o (B) It must be manually started but once running will automatically supply power to the 450 VACsection of the emergency bus through the automatic bus transfer device.

• (C) It will automatically start and automatically supply power to the 450 VAC section of theemergency bus through the automatic bus transfer device.

o (D) It will automatically start and automatically supply power to the 450 VAC section of the mainbus through the automatic bus transfer device.



8/21/2019

National Maritime Center

Serving Our Nation’s Mariners

10/5/2018

EL-0001

Adapted for testing purposes only from MAZUR, Troubleshooting

Electric Motors, Fourth Edition

Copyright © 2010 by American Technical Publishers, Inc.

Further reproduction prohibited without permission of 37 Q615 Electrical Electronics and Control Engineering



10/5/2018

EL-0014

Adapted for testing purposes only from HUNT, Modern Marine Engineer’s Manual,

Volume II, Third Edition

Copyright © 2002 by Cornell Maritime Press, Inc.




10/5/2018

EL-0015

Adapted for testing purposes only from GROB, Basic Electronics, Fourth Edition

Copyright © 1977 by McGraw-Hill, Inc.

Further reproduction prohibited without permission of 37




10/5/2018

EL-0038

Adapted for testing purposes only from GROB, Basic Electronics, Fourth Edition

Copyright © 1977 by McGraw-Hill, Inc.





10/5/2018

EL-0067

Adapted for testing purposes only from HALL, Practical Marine Electrical Knowledge, 3rd Edition

Copyright © 2014 by Dennis T. Hall

Further reproduction prohibited without permission




10/5/2018

EL-0078

Adapted for testing purposes only from GROB, Basic Electronics, 4th Edition

Copyright © 1977 by McGraw-Hill Inc.





10/5/2018

EL-0082

Adapted for testing purposes only from HUBERT, Operating, Testing, and Preventive

Maintenance of Electrical Power Apparatus

Copyright © 2003 by Pearson Education, Inc.





10/5/2018

EL-0085

Adapted for testing purposes only from Introduction to Solid-State Devices and

Power Supplies Training Series, Module 7

NAVEDTRA 14179




10/5/2018

EL-0088

Adapted for testing purposes only from GROB, Basic Electronics, 4th Edition

Copyright © 1977 by McGraw-Hill Inc.




10/5/2018

EL-0093

Adapted for testing purposes only from HOSE-McCANN, Sound Powered Telephones

Copyright © 1964 by Hose-McCann Telephone Co.





10/10/2018

EL-0177

Adapted for testing purposes only Further reproduction prohibited without permission of 37




10/10/2018

EL-0179

Adapted for testing purposes only Further reproduction prohibited without permission of 37




10/11/2018

EL-0218

Adapted for testing purposes only





10/11/2018

EL-0231 Relay and PLC Logic Compared

Fig. A and B: Adapted for testing purposes only from

HERMAN, Industrial Motor Control, 6th Edition

Copyright © 2010 by Delmar, Cengage Learning


Fig. C and D: Adapted for testing purposes only from

BOLTON, Programmable Logic Controllers, 5th Edition

Copyright © 2009 by Elsevier Ltd.



U.S.C.G. Merchant Marine Exam Assistant Engineer – Limited ......system conductor of which system...

Documents

Transcript of U.S.C.G. Merchant Marine Exam Assistant Engineer – Limited ......system conductor of which system...