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All Electrical Engineering MCQs

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

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1981Electrical EngineeringMedium

Which of the following motors has series characteristics?

AShaded pole motor

BRepulsion motor

CNone of the above

DCapacitor start motor

Correct answer

B. Repulsion motor

Explanation

The correct answer is Repulsion motor.

1982Electrical EngineeringMedium

A Weston frequency meter is________?

Amoving coil instrument

Bnone of the above

Cdynamometer instrument

Dmoving iron instrument

Correct answer

D. moving iron instrument

Explanation

The correct answer is moving iron instrument.

1983Electrical EngineeringMedium

A non-dimensional number generally associated with natural convection heat transfer is________?

ANusselt number

BGrashoff number

CPecelet number

DPrandtl number

Correct answer

B. Grashoff number

Explanation

The correct answer is Grashoff number.

1984Electrical EngineeringMedium

The active material of the positive plates of silver-zinc batteries is________?

Alead oxide

Bsilver oxide

Czinc powder

Dlead

Correct answer

B. silver oxide

Explanation

The correct answer is silver oxide.

1985Electrical EngineeringMedium

The d.c. resistance of a crystal diode is ________ its a.c. resistance?

Amore than

Bless than

Cthe same as

Dnone of the above

Correct answer

B. less than

Explanation

The correct answer is less than.

1986Electrical EngineeringMedium

No-load current of a transformer has________?

Ahas high magnitude and low power factor

Bhas small magnitude and low power factor

Chas high magnitude and high power factor

Dhas small magnitude and high power factor

Correct answer

B. has small magnitude and low power factor

Explanation

The correct answer is has small magnitude and low power factor.

1987Electrical EngineeringMedium

Which quantity consists of a unit 1KWh?

ACharge

BPower

CEnergy

DTime

Correct answer

C. Energy

Explanation

1 kWh is the amount of energy used by a 1 kW (1000 watt) resistance for 1 hour. Energy = Power × Time.

1988Electrical EngineeringMedium

RC coupling is not used to amplify extremely low frequencies because________?

AThere is hum in the output

BThere is considerable power loss

CElectrical size of coupling capacitor becomes very large

DNone of the above

Correct answer

C. Electrical size of coupling capacitor becomes very large

Explanation

The correct answer is Electrical size of coupling capacitor becomes very large.

1989Electrical EngineeringMedium

Thyristor is nothing but a________?

AAmplifier with large current gain

BControlled switch

CAmplifier with higher gain

DControlled transistor

Correct answer

B. Controlled switch

Explanation

The correct answer is Controlled switch.

1990Electrical EngineeringMedium

In a level compounded D.C. generator, full load terminal voltage is________?

Amore than no-load terminal voltage

Bless than no-load terminal voltage

Cnegligibly low

Dequal to no-load terminal voltage

Correct answer

D. equal to no-load terminal voltage

Explanation

The correct answer is equal to no-load terminal voltage.

RC coupling is not used to amplify extremely low frequencies because________?

AThere is hum in the output

BThere is considerable power loss

CElectrical size of coupling capacitor becomes very large

DNone of the above

Correct answer

C. Electrical size of coupling capacitor becomes very large

Explanation

The correct answer is Electrical size of coupling capacitor becomes very large.