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All Electrical Engineering MCQs

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

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851Electrical EngineeringMedium

Which of the following materials are diamagnetic?

AIron

BCopper

CSilver

DSilver and copper

Correct answer

D. Silver and copper

Explanation

The correct answer is Silver and copper.

852Electrical EngineeringMedium

During short circuit test iron losses are negligible because of ________?

Athe voltage on secondary side does not vary

Bthe voltage applied on primary side is low

Cfull-load current is not supplied to the transformer

Dthe current on secondary side is negligible

Correct answer

B. the voltage applied on primary side is low

Explanation

The correct answer is the voltage applied on primary side is low.

853Electrical EngineeringMedium

In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ________?

AIncreased 4 times

BIncreased 2 times

CDecreased 4 times

DDecreased 2 times

Correct answer

D. Decreased 2 times

Explanation

The correct answer is Decreased 2 times.

854Electrical EngineeringMedium

Commonly used standard capacitor is________?

Amultilayer parallel plate type

Bconcentric cylindrical type

Celectrostatic type

Dspherical type

Correct answer

B. concentric cylindrical type

Explanation

The correct answer is concentric cylindrical type.

855Electrical EngineeringMedium

Induction type single phase energy meters measure electric energy in________?

ANone of the above

BkW

CkWh

DWh

EVAR

Correct answer

C. kWh

Explanation

The correct answer is kWh.

856Electrical EngineeringMedium

Which of the following method of speed control of D.C. machine will offer minimum efficiency?

AField control method

BArmature control method

CVoltage control method

DAll above methods

Correct answer

B. Armature control method

Explanation

The correct answer is Armature control method.

857Electrical EngineeringMedium

Belted slip ring induction motor is almost invariably used for________?

Ajaw crushers

Bnone of the above

Cwater pumps

Dcentrifugal blowers

Correct answer

A. jaw crushers

Explanation

The correct answer is jaw crushers.

858Electrical EngineeringMedium

In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be________?

ANs

B(Ns-l)s

C(l-s)Ns

Ds.N,

Correct answer

C. (l-s)Ns

Explanation

The correct answer is (l-s)Ns.

859Electrical EngineeringMedium

The voltage gain in a transistor connected in________arrangement is the highest?

Acommon collector

Bnone of the above

Ccommon emitter

Dcommon base

Correct answer

C. common emitter

Explanation

The correct answer is common emitter.

860Electrical EngineeringMedium

A zener diode is used as ________?

Aa multivibrator

Ba voltage regulator

Can amplifier

Da rectifier

Correct answer

B. a voltage regulator

Explanation

The correct answer is a voltage regulator.

During short circuit test iron losses are negligible because of ________?

Athe voltage on secondary side does not vary

Bthe voltage applied on primary side is low

Cfull-load current is not supplied to the transformer

Dthe current on secondary side is negligible

Correct answer

B. the voltage applied on primary side is low

Explanation

The correct answer is the voltage applied on primary side is low.