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All Electrical Engineering MCQs

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

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451Electrical EngineeringMedium

Natural oil cooling is used for transformers up to a rating of________?

A250 kVA

B500 kVA

C3000 kVA

D1000 kVA

Correct answer

C. 3000 kVA

Explanation

The correct answer is 3000 kVA.

452Electrical EngineeringMedium

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C________?

Acompound motor

Bseries motor

Cshunt motor

Dseparately excited motor

Correct answer

A. compound motor

Explanation

The correct answer is compound motor.

453Electrical EngineeringMedium

Direct conversion of heat into electric power is possible through________?

Afuel cell

Bbatteries

Call of the above

Dthermionic converter

Correct answer

D. thermionic converter

Explanation

The correct answer is thermionic converter.

454Electrical EngineeringMedium

Underground cables are laid at sufficient depth________?

Afor all of the above reasons

Bto minimize the effect of shocks and vibrations due to gassing vehicles, etc

Cto minimise temperature stresses

Dto avoid being unearthed easily due to removal of soil

Correct answer

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

Explanation

The correct answer is to minimize the effect of shocks and vibrations due to gassing vehicles, etc.

455Electrical EngineeringMedium

In ________ method of staging three phase induction motors the starting voltage is not reduced?

Aauto-transformer

Bany of the above

Cstar-delta

Dslip ring

Correct answer

D. slip ring

Explanation

The correct answer is slip ring.

456Electrical EngineeringMedium

Man made noise are________ variations?

APhase

BAmplitude

CBoth phase and frequency

DFrequency

Correct answer

B. Amplitude

Explanation

The correct answer is Amplitude.

457Electrical EngineeringMedium

If d.c. supply of 10 V is fed to a differentiating circuit, then output will be________?

A10 V

B0 V

CNone of the above

D20 V

Correct answer

B. 0 V

Explanation

The correct answer is 0 V.

458Electrical EngineeringMedium

When V is the applied voltage, then the breakdown torque of a synchronous motor varies as________?

A1/V

CV2

DV312

Correct answer

B. V

Explanation

The correct answer is V.

459Electrical EngineeringMedium

Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control________?

Athree point starter is used

Ball above can be used

Cdrum type controller is used

Dfour point starter is used

Correct answer

C. drum type controller is used

Explanation

The correct answer is drum type controller is used.

460Electrical EngineeringMedium

The noise factor of an ideal amplifier expressed in dB is________?

B10

Correct answer

A. 0

Explanation

The correct answer is 0.

Underground cables are laid at sufficient depth________?

Afor all of the above reasons

Bto minimize the effect of shocks and vibrations due to gassing vehicles, etc

Cto minimise temperature stresses

Dto avoid being unearthed easily due to removal of soil

Correct answer

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

Explanation

The correct answer is to minimize the effect of shocks and vibrations due to gassing vehicles, etc.