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All Electrical Engineering MCQs

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

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3521Electrical EngineeringMedium

In radiative coupling, the emitter radiation field________?

ADecays as 2R, where R is the separation distance between the emitter and the receptor

BDecays as 1 / 2 R, where R is the separation distance between the emitter and the receptor

CDecays as R, where R is the separation distance between the emitter and the receptor

DDecays as 1 / R, where R is the separation distance between the emitter and the receptor

Correct answer

D. Decays as 1 / R, where R is the separation distance between the emitter and the receptor

Explanation

The correct answer is Decays as 1 / R, where R is the separation distance between the emitter and the receptor.

3522Electrical EngineeringMedium

The flash point of transformer oil should be higher than________?

A104°C

B40°C

C60°C

D80°C

Correct answer

A. 104°C

Explanation

The correct answer is 104°C.

3523Electrical EngineeringMedium

To detect an over – current fault condition, the most reliable method is to connect a________?

AVoltage sensor in series with IGBT

BCurrent sensor across IGBT

CCurrent sensor in series with IGBT

DVoltage sensor across IGBT

Correct answer

C. Current sensor in series with IGBT

Explanation

The correct answer is Current sensor in series with IGBT.

3524Electrical EngineeringMedium

The force per unit charge is know as________?

Aelectric flux

Ball of above are same

Celectric potential

Delectric intensity

Correct answer

D. electric intensity

Explanation

The correct answer is electric intensity.

3525Electrical EngineeringMedium

In D.C. generators, lap winding is used for________?

Alow voltage, low current

Bhigh voltage, high current

Chigh voltage, low current

Dlow voltage, high current

Correct answer

D. low voltage, high current

Explanation

The correct answer is low voltage, high current.

3526Electrical EngineeringMedium

DIAC are specifically designed to trigger________?

ASCR

BGTO

CTRIAC

DOnly (a) and (b)

Correct answer

D. Only (a) and (b)

Explanation

The correct answer is Only (a) and (b).

3527Electrical EngineeringMedium

The current flow through electrolyte is due to the movement of________?

Aions

Belectrons

Cnone of the above

Dholes

Correct answer

A. ions

Explanation

The correct answer is ions.

3528Electrical EngineeringMedium

Power transformers should be designed to have maximum efficiency________?

Aany of the above

Bat one-half load

Cat or near full load

Dat one-fourth load

Correct answer

C. at or near full load

Explanation

The correct answer is at or near full load.

3529Electrical EngineeringMedium

The rapid wear of brushes takes place due to________?

Aexcessive spring pressure

Bhigh mica insulation between com-mutation bars

Call of the above factors

Drough commutator bars

Eabrasion from dust

Correct answer

C. all of the above factors

Explanation

The correct answer is all of the above factors.

3530Electrical EngineeringMedium

When the lead-acid cell is fully charged, the electrolyte assumes ________ appearance

Abright

Bmilky

Cdull

Dreddish

Correct answer

B. milky

Explanation

The correct answer is milky.

In radiative coupling, the emitter radiation field________?

ADecays as 2R, where R is the separation distance between the emitter and the receptor

BDecays as 1 / 2 R, where R is the separation distance between the emitter and the receptor

CDecays as R, where R is the separation distance between the emitter and the receptor

DDecays as 1 / R, where R is the separation distance between the emitter and the receptor

Correct answer

D. Decays as 1 / R, where R is the separation distance between the emitter and the receptor

Explanation

The correct answer is Decays as 1 / R, where R is the separation distance between the emitter and the receptor.