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All Electrical Engineering MCQs

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

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2971Electrical EngineeringMedium

The chemical used in breather for transformer should have the quality of________?

Acooling the transformer oil

Bcleansing the transformer oil

Cionizing air

Dabsorbing moisture

Correct answer

D. absorbing moisture

Explanation

The correct answer is absorbing moisture.

2972Electrical EngineeringMedium

In Hopkinson demand rate or two part tariff the demand rate or fixed charges are________?

Aneither A nor B

Bdependent upon the energy consumed

Cboth A and B

Ddependent upon the maximum demand of the consumer

Correct answer

D. dependent upon the maximum demand of the consumer

Explanation

The correct answer is dependent upon the maximum demand of the consumer.

2973Electrical EngineeringMedium

A fuse is never inserted in________?

Anegative of D.C. circuit

Bneutral wire

Cpositive of D.C. circuit

Dphase dine

Correct answer

B. neutral wire

Explanation

The correct answer is neutral wire.

2974Electrical EngineeringMedium

Compared to transistor, ________ have lower on state conduction losses and higher power handling capability?

AMOSFETs

BTRIACs

CSemi conductor diodes

DThyristor

Correct answer

D. Thyristor

Explanation

The correct answer is Thyristor.

2975Electrical EngineeringMedium

When a transistor is cut off ________?

AMaximum current flows

BMaximum voltage appears across load

CNone of the above

DMaximum voltage appears across transistor

Correct answer

D. Maximum voltage appears across transistor

Explanation

The correct answer is Maximum voltage appears across transistor.

2976Electrical EngineeringMedium

The property of a conductor due to which it passes current is called________?

Ainductance

Bresistance

Creluctance

Dconductance

Correct answer

D. conductance

Explanation

The correct answer is conductance.

2977Electrical EngineeringMedium

The load voltage is approximately constant when a Zener diode is ________?

AForward biased

BReverse biased

CUnbiased

DOperating in the breakdown region

Correct answer

D. Operating in the breakdown region

Explanation

The correct answer is Operating in the breakdown region.

2978Electrical EngineeringMedium

In an op-amp differentiator:________?

Athe amplitude of output is proportional to rate of change of input

Boutput occurs when input is finite and constant

Cthe amplitude of output is proportional to input

Dpolarity of input and output is the same

Correct answer

A. the amplitude of output is proportional to rate of change of input

Explanation

The correct answer is the amplitude of output is proportional to rate of change of input.

2979Electrical EngineeringMedium

The output stage of a multistage amplifier usually employs ________?

APush-pull amplifier

BClass A power amplifier

CNone of the above

DPreamplifier

Correct answer

A. Push-pull amplifier

Explanation

The correct answer is Push-pull amplifier.

2980Electrical EngineeringMedium

If metallic conductor is charged negatively then its weight________?

ADecreases then increases

BRemains same

CIncreases for a while

DFirst increases then decreases

Correct answer

C. Increases for a while

Explanation

The correct answer is Increases for a while.

In an op-amp differentiator:________?

Athe amplitude of output is proportional to rate of change of input

Boutput occurs when input is finite and constant

Cthe amplitude of output is proportional to input

Dpolarity of input and output is the same

Correct answer

A. the amplitude of output is proportional to rate of change of input

Explanation

The correct answer is the amplitude of output is proportional to rate of change of input.