EEE Round 2 quiz

7/29/2019 EEE Round 2 quiz

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EEE Engineers day(2013-2014)

QUIZ COMPETITION

ROUND-210-09-2013


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2 MARKS 3 MARKS 4 MARKS


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2 MARKS ?1 2 3 4 5

6 7 8 9 10

11 12 13 14 15


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3 MARKS ?16 17 18 19 20

21 22 23 24 25

26 27 28 29 30


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4 MARKS ?

31 32 33 34 35

36 37 38 39 40

41 42 43 44 45


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1.Newton/coulomb is the unit of


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2. When a sample of germanium and silicon having same impurity

density are kept at room temperature then?

a) Both will have equal value of resistivity

b) Both will have equal value negative resistivityc) Resistivity of germanium will be higher than that of silicon

d) Resistivity of silicon will be higher than that of germanium


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3. Star- delta starter of an induction motor

A) Inserts resistance in rotor circuit

B) Inserts resistance in stator circuit

C) Applies reduced voltage to rotor

D) Applies reduced voltage to stator


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4. Sumpner's test is conducted on transformers tofind

A. Temperature

B. Stray losses

C. All-day efficiency

D. None of the above


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5. One coulomb is approximately equivalent to

electrons


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6. Pole changing method of speed control is usedin

(A) slip ring induction motor

(B) dc shunt motor(C) dc series motor

(D) squirrel cage induction motor.


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7. Surge voltage originate in power systems due

to

(A) lightning

(B) switching operations

(C) faults

(D) any of the above.


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8. In overhead transmission lines the effect of

capacitance can be neglected when the length

of line is less than

(A) 200 km

(B) 160 km

(C) 100 km

(D) 80 km.


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9. Which of the following is a leading power

system ?

(A) Underground cables(B) Reactors

(C) Mercury arc rectifiers

(D)Transformers.


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10) . Large capacity generators are manufactured

to generate power at

(A) 440 V

(B) 6.3 to 10.5 kV

(C) 132 kV to 220 kV

(D) 400 kV.


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11. 100 watt lamp has__________

resistance than a 40 watt lamp.


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12. Production of heat due to current is related

by which law

(A) Ohm's law

(B) Joule's law

(C) Kelvin's law

(D) Maxwell's law.


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13. The transformer laminations are insulated

from each other byA. Mica strip

B. Thin coat of varnish

C. PaperD. Any of the above


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14. Load factor is defined as the ratio of

A. max demand/ average demand

B. average demand/ connected load

C. average demand/ max. demandD. connected load/ max demand


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15. The sole purpose of a commutator in a dc

generator is to

a. increase output voltage

b. reduce sparking at brushesc. provide smoother output

d. convert the induced ac into dc


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16. An ideal dc generator has .......... voltage

regulation.

a. low

b. zeroc. positive

d. negative


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17. The voltage regulation of an over

compound dc generator is always

a. Positive

b. negativec. zero

d. high


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18. Star- delta starter of an induction motor

A. Inserts resistance in rotor circuit

B. Inserts resistance in stator circuitC. Applies reduced voltage to rotor

D. Applies reduced voltage to stator


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19. The thrust developed by a linear induction

motor depends on

A. Synchronous speed

B. Rotor inputC. Number of poles

D. both A and B


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20. A diode can be used as a frequency multiplier

because of its

A. Junction capacitance

B. Non linearity

C. Avalanche voltage

D. Forward breakover

E. Charge carrier concentration


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21. The VA rating of a transformer is an expression of

A. The maximum frequency at which it can function

B. The type of core material it has

C. The voltage step-up or step-down ratio

D. The impedance transfer ratio

E. None of the above


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22. A power gain of 30dB is equivalent to which

amplification factor?

A. 0.001

B. 1/30

C. 30

D. 1000


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23. A hot-wire ammeter

A. Can measure ac as well as dc

B. Registers current changes very fastC. Can indicate very low voltages

D. Measures electrical energy


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24. A voltmeter should have

A. Low internal resistance

B. High internal resistanceC. Electrostatic plates

D. A sensitive amplifier


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25. A transistor is in active region when-

a) IB = IC

b) IC = IBc) IC = IE

d) IC = IB


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26. In a JFET gates are always?

a) forward biased

b) reverse biasedc) unbiased

d) none


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27. Synchronous capacitor is

A. An ordinary static capacitor bank

B. An over excited synchronous motor driving

mechanical loadC. An over excited synchronous motor running

without mechanical load

D. None of the above


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28. Which of the following has leastconductivity?

A. Silver

B. Copper

C. Aluminum

D. Gold


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29. A branch of a network is said to be passivewhen it contains

A. Voltmeter

B. voltage source

C. current source

D. Battery


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30. An electrical circuit with 10 branches and 7nodes will have

A. 10 loop equations

B. 7 loop equations

C. 3 loop equations.

D. 4 loop equations.


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31. Consider the circuit: Which of the following

statement is correct ?

A. passive and linear

B. active and linear

C. passive and non-linear

D. active and non-linear


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32. Constantan contains

A. silver & tin.

B. tungsten & silver

C. copper and tungsten

D. copper and nickel


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33. If the resistance of a conductor does not vary in

accordance with the Ohms laws it is known as

A. Non-conductor

B. Non-linear conductor

C. Bad conductor

D. Reverse conductor


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34. Generators works on the principle ofproduction

A. Dynamically induced emf.

B. Static induced emf.

C. None of the above.

D. both A and B.


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35. Pelton wheel turbine is a

A. high head turbine.

B. medium head turbine.

C. low head turbine.

D. none of above.


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36. Which of the following is a reaction turbines.

A. pelton turbine and Francis turbine.

B. Francis turbine and Kaplan turbine.

C. Kaplan and pelton turbine.

D. None of these.


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37. The safety factor of insulators is defined asratio of

A. Flash over voltage to puncture voltage

B. Puncture voltage to flash over voltage

C. Current to voltage

D. Current to power


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38. In Induction Motor the 7th harmonic torque may

make the motor rotate at (1/7)th synchronous speed.

This is called

A. crawling

B. resonance

C. harmonics

D. cogging


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39. Which motor used in Lathe machine-

A. D.C . Series motor.

B. D.C. Shunt motor.

C. D.C. cumulative compound motor

D. none of the above.


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40. when bundle conductor are used in place of single

conductor the effective inductance and capacitance

will respectively

A. decrease and increase

B. increase and decrease

C. increase and remain unaffected

D. decrease and remain unaffected


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41. In a transistor amplifier the ______junctionis reverse biased.

A. collector base junction

B. Emitter base junction

C. CE base junction

D. none of these.


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42. Which type of dc motor is employed in adomestic vacuum cleaner

A. dc series motor

B. dc shunt

C. dc short shunt compound

D. dc long shunt compound


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43. Advantage of active filter is

A. do not offer gain

B. easy to tune

C. both

D. derive high impedance load


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44. What type of dielectric material is used in capacitors

used for fans and for p.f correction

A. oil impregnated paper

B. vacuum

C. glass

D. mica


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45. Which combination is true for short lines

A. A =1, B=Z, C=0, D=1

B. . A=0, B=1, C= Z, D=1

C. A=1, B=1, C= Z, D=0

D. A=0, B=0, C=1, D=Z


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1. Electric field intensity.


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2. d


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3.D


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4.A


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5. 6*10^18


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6.D


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7.D


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8.D


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9.A


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10.B


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11.LESS


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12.B


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13.B


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14.D


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15.D


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16.B


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17.B


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18.D


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19.D


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20.B


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21.E


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22.D


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23.A


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24.B


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25.B


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26.C


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27.C


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28.C


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29.A


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30.D


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31.B


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32.D


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33.B


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34.D


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35.A


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36.B


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37.B


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38.A


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39.B


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40.A


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41.A


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42.A


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44.A


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45.A


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END

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