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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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1991Electrical EngineeringMedium

The resistivity of a pure silicon is about ________?

A6 x 10-8 O cm

B3 x 105 O m

C100 O cm

D6000 O cm

Correct answer

D. 6000 O cm

Explanation

The correct answer is 6000 O cm.

1992Electrical EngineeringMedium

A carbon resistor contains________?

Afinely divided carbon black

Bpulverized coal

Ccarbon crystals

Dsolid carbon granules

Correct answer

A. finely divided carbon black

Explanation

The correct answer is finely divided carbon black.

1993Electrical EngineeringMedium

Ward-Leonard control is basically a________?

Afield divertor method

Barmature resistance control method

Cfield control method

Dvoltage control method

Correct answer

D. voltage control method

Explanation

The correct answer is voltage control method.

1994Electrical EngineeringMedium

Overhead telephone wires are made of________?

AACSR conductors

Bsteel

Caluminium

Dcopper

Correct answer

B. steel

Explanation

The correct answer is steel.

1995Electrical EngineeringMedium

Which of the following should be done to make an unstable system stable?

AThe gain of the system should be decreased

BThe gain of the system should be increased

CThe number of zeros to the loop transfer function should be increased

DThe number of poles to the loop transfer function should be increased

Correct answer

B. The gain of the system should be increased

Explanation

The correct answer is The gain of the system should be increased.

1996Electrical EngineeringMedium

A pn junction acts as a________?

AUnidirectional switch

BNone of the above

CBidirectional switch

DControlled switch

Correct answer

A. Unidirectional switch

Explanation

The correct answer is Unidirectional switch.

1997Electrical EngineeringMedium

Excessive charging a battery tends to________?

Abring about all above changes

Bproduce gassing

Cincrease the internal resistance of the battery

Dto corrode the positive plates into lead peroxide thereby weakening them physically

Correct answer

A. bring about all above changes

Explanation

The correct answer is bring about all above changes.

1998Electrical EngineeringMedium

The pulsating d.c. applied to power amplifier causes________?

AExcessive forward voltage

BHum in the circuit

CBurning of transistor

DNone of the above

Correct answer

B. Hum in the circuit

Explanation

The correct answer is Hum in the circuit.

1999Electrical EngineeringMedium

An important advantage of a synchronous motor over wound round induction motor is that

Aits speed is independent of supply frequency

Bnone of the above

Cits power factor may be varied at will

Dits speed may be controlled more easily

Correct answer

C. its power factor may be varied at will

Explanation

The correct answer is its power factor may be varied at will.

2000Electrical EngineeringMedium

Positive logic in a logic circuit is one in which________?

Alogic 0 and 1 are represented by 0 and positive voltage respectively

Blogic 0 voltage level is higher than logic 1 voltage level

Clogic 0 and, -1 are represented by negative and positive voltages respectively

Dlogic 0 voltage level is lower than logic 1 voltage level

Correct answer

D. logic 0 voltage level is lower than logic 1 voltage level

Explanation

The correct answer is logic 0 voltage level is lower than logic 1 voltage level.

Which of the following should be done to make an unstable system stable?

AThe gain of the system should be decreased

BThe gain of the system should be increased

CThe number of zeros to the loop transfer function should be increased

DThe number of poles to the loop transfer function should be increased

Correct answer

B. The gain of the system should be increased

Explanation

The correct answer is The gain of the system should be increased.

Positive logic in a logic circuit is one in which________?

Alogic 0 and 1 are represented by 0 and positive voltage respectively

Blogic 0 voltage level is higher than logic 1 voltage level

Clogic 0 and, -1 are represented by negative and positive voltages respectively

Dlogic 0 voltage level is lower than logic 1 voltage level

Correct answer

D. logic 0 voltage level is lower than logic 1 voltage level

Explanation

The correct answer is logic 0 voltage level is lower than logic 1 voltage level.