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All Electrical Engineering MCQs

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

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2531Electrical EngineeringMedium

Out of the following capacitors of identical rating which one will have the smallest dimensions ________?

ACeramic capacitor

BAluminium foil capacitor

CMica capacitor

DPaper capacitor

Correct answer

A. Ceramic capacitor

Explanation

The correct answer is Ceramic capacitor.

2532Electrical EngineeringMedium

A synchronous motor can be started by________?

Apony motor

BD.C. compound motor

Cany of the above

Dproviding damper winding

Correct answer

C. any of the above

Explanation

The correct answer is any of the above.

2533Electrical EngineeringMedium

When a multistage amplifier is to amplify d.c. signal, then one must use________coupling?

ANone of the above

BDirect

CRC

DTransformer

Correct answer

B. Direct

Explanation

The correct answer is Direct.

2534Electrical EngineeringMedium

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in________?

Apower factor of one of the transformers is leading while that of the other lagging

Bshort-circuiting of the secondaries

Ctransformers having higher copper losses will have negligible core losses

Dloading of the transformers not in proportion to their kVA ratings

Correct answer

D. loading of the transformers not in proportion to their kVA ratings

Explanation

The correct answer is loading of the transformers not in proportion to their kVA ratings.

2535Electrical EngineeringMedium

Which of the following load is responsible for lower power factor of supply system________?

Ainduction motors

Bsynchronous Motors

Call of the above

Dresistive loads

Correct answer

A. induction motors

Explanation

The correct answer is induction motors.

2536Electrical EngineeringMedium

When either L or C is increased, the resonant frequency of LC circuit ________?

AIncreases

BInsufficient data

CRemains the same

DDecreases

Correct answer

D. Decreases

Explanation

The correct answer is Decreases.

2537Electrical EngineeringMedium

The input stage of an Op-amp is usually a ________?

ACE amplifier

Bswamped amplifier

Cdifferential amplifier

Dclass B push-pull amplifier

Correct answer

C. differential amplifier

Explanation

The correct answer is differential amplifier.

2538Electrical EngineeringMedium

The time constant of the capacitance circuit is defined as the time during which voltage________?

Arises to 63.2% of its final steady value

Bfalls to 36.8% of its final steady value

Cnone of the above

Drises to 38.6% of its final steady value

Correct answer

A. rises to 63.2% of its final steady value

Explanation

The correct answer is rises to 63.2% of its final steady value.

2539Electrical EngineeringMedium

Thermal circuit breaker has________?

Aboth of the above

Bdelayed trip action

Cinstantaneous trip action

Dnone of the above

Correct answer

B. delayed trip action

Explanation

The correct answer is delayed trip action.

2540Electrical EngineeringMedium

The disadvantage of impedance matching is that it ________?

ARequires a transformer

BGives distorted output

CNone of the above

DGives low power output

Correct answer

B. Gives distorted output

Explanation

The correct answer is Gives distorted output.

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in________?

Apower factor of one of the transformers is leading while that of the other lagging

Bshort-circuiting of the secondaries

Ctransformers having higher copper losses will have negligible core losses

Dloading of the transformers not in proportion to their kVA ratings

Correct answer

D. loading of the transformers not in proportion to their kVA ratings

Explanation

The correct answer is loading of the transformers not in proportion to their kVA ratings.