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All Electrical Engineering MCQs

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

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1421Electrical EngineeringMedium

A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be?

APaper capacitor

BAny-of the above

CElectrolytic capacitor

DCeramic capacitor

Correct answer

C. Electrolytic capacitor

Explanation

The correct answer is Electrolytic capacitor.

1422Electrical EngineeringMedium

An air gap is usually inserted in magnetic circuits to________?

Aprevent saturation

Bincrease m.m.f.

Cincrease the flux

Dnone of the above

Correct answer

A. prevent saturation

Explanation

The correct answer is prevent saturation.

1423Electrical EngineeringMedium

Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across________?

ARi

Beither Rl or Ri

CRl

Dnone of them

Correct answer

C. Rl

Explanation

The correct answer is Rl.

1424Electrical EngineeringMedium

Which of the following is the least expensive protection for overcurrent is low voltage system?

AAir break circuit breaker

BOil circuit breaker

CNone of the above

DRewireable fuse

EIsolator

Correct answer

D. Rewireable fuse

Explanation

The correct answer is Rewireable fuse.

1425Electrical EngineeringMedium

Electrical machines having a power output up to about 750 W may be called________machines?

Aany of the above

Blarge size

Csmall size

Dmedium size

Correct answer

C. small size

Explanation

The correct answer is small size.

1426Electrical EngineeringMedium

If three 15 uF capacitors are connected in series, the net capacitance is

A30 uF

B5 uF

C45 uF

D50 uF

Correct answer

B. 5 uF

Explanation

The correct answer is 5 uF.

1427Electrical EngineeringMedium

In D.C. machines the residual magnetism is of the order of________?

A10 to 15 per cent

B20 to 25 per cent

C50 to 75 per cent

D2 to 3 per cent

Correct answer

D. 2 to 3 per cent

Explanation

The correct answer is 2 to 3 per cent.

1428Electrical EngineeringMedium

If the gate voltage of an SCR is removed, then the________?

Acathode current increases

Banode current decreases

Canode current does not decrease at all

Danode current increases

Correct answer

C. anode current does not decrease at all

Explanation

The correct answer is anode current does not decrease at all.

1429Electrical EngineeringMedium

Hysteresis motor is particularly useful for high-quality record players and tape-recorders because________?

Ait revolves synchronously

Bit can be easily manufactured in extremely small sizes of up to 1 W output

Cit is not subject to any magnetic or mechanical vibrations

Dit develops hysteresis torque which is extremely steady both in amplitude and phase

Correct answer

D. it develops hysteresis torque which is extremely steady both in amplitude and phase

Explanation

The correct answer is it develops hysteresis torque which is extremely steady both in amplitude and phase.

1430Electrical EngineeringMedium

Delay time is defined by the interval when________?

Aanode voltage drops from 100 % to 90 % of its actual value

Bgate current increases from 90 % to 100 % of its final value

Call of these

Danode current reaches 10 % from forward leakage current

Correct answer

C. all of these

Explanation

The correct answer is all of these.

Hysteresis motor is particularly useful for high-quality record players and tape-recorders because________?

Ait revolves synchronously

Bit can be easily manufactured in extremely small sizes of up to 1 W output

Cit is not subject to any magnetic or mechanical vibrations

Dit develops hysteresis torque which is extremely steady both in amplitude and phase

Correct answer

D. it develops hysteresis torque which is extremely steady both in amplitude and phase

Explanation

The correct answer is it develops hysteresis torque which is extremely steady both in amplitude and phase.