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All Electrical Engineering MCQs

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

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941Electrical EngineeringMedium

As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it________?

Alies in a magnetic field

Bmoves parallel to the direction of the magnetic field

Ccuts magnetic flux

Dlies perpendicular to the magnetic flux

Correct answer

C. cuts magnetic flux

Explanation

The correct answer is cuts magnetic flux.

942Electrical EngineeringMedium

If the doping level is increased, the breakdown voltage of the Zener________?

ARemains the same

BIs decreased

CIs increased

DNone of the above

Correct answer

B. Is decreased

Explanation

The correct answer is Is decreased.

943Electrical EngineeringMedium

The gravity controlled instrument has crowded scale because current is proportional to________?

Adeflection angle

Bsine of deflection angle

Cbalancing weight

Correct answer

B. sine of deflection angle

Explanation

The correct answer is sine of deflection angle.

944Electrical EngineeringMedium

In case of a shaded pole motor the direction of rotation of the motor is________?

Aeither of the above depending on voltage

Bfrom shaded pole to main pole

Ceither of the above depending on power factor

Dfrom main pole to shaded pole

Correct answer

D. from main pole to shaded pole

Explanation

The correct answer is from main pole to shaded pole.

945Electrical EngineeringMedium

In a separately excited generator supplying rated load the armature reaction.

Ais always present

Bis always absent

Cnone of the above

Dmay be sometimes present

Correct answer

A. is always present

Explanation

The correct answer is is always present.

946Electrical EngineeringMedium

Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

ABrake test

BHopkinson’s test

CSwinburne’s test

DField test

Correct answer

D. Field test

Explanation

The correct answer is Field test.

947Electrical EngineeringMedium

Satellite power requirement is provided through________?

Anickel-cadmium cells

Bdry cells

Csolar cells

Dlead-acid batteries

Correct answer

C. solar cells

Explanation

The correct answer is solar cells.

948Electrical EngineeringMedium

An ideal transformer is one which has________?

Aa common core for its primary and secondary windings

Bno losses and magnetic leakage

Ccore of stainless steel and winding of pure copper metal

Dinterleaved primary and secondary windings

Enone of the above

Correct answer

B. no losses and magnetic leakage

Explanation

The correct answer is no losses and magnetic leakage.

949Electrical EngineeringMedium

During load shedding:

Asystem voltage is reduced

Bsystem frequency is reduced Efficiency is the secondary consideration in

Csystem power factor is changed

Dsome loads are switched off

Correct answer

D. some loads are switched off

Explanation

The correct answer is some loads are switched off.

950Electrical EngineeringMedium

In an induction motor the relationship between stator slots and rotor slots is that________?

Astator slots are exact multiple of rotor slots

Bnone of the above

Cstator slots are not exact multiple of rotor slots

Dstator slots are equal to rotor slots

Correct answer

C. stator slots are not exact multiple of rotor slots

Explanation

The correct answer is stator slots are not exact multiple of rotor slots.

An ideal transformer is one which has________?

Aa common core for its primary and secondary windings

Bno losses and magnetic leakage

Ccore of stainless steel and winding of pure copper metal

Dinterleaved primary and secondary windings

Enone of the above

Correct answer

B. no losses and magnetic leakage

Explanation

The correct answer is no losses and magnetic leakage.

In an induction motor the relationship between stator slots and rotor slots is that________?

Astator slots are exact multiple of rotor slots

Bnone of the above

Cstator slots are not exact multiple of rotor slots

Dstator slots are equal to rotor slots

Correct answer

C. stator slots are not exact multiple of rotor slots

Explanation

The correct answer is stator slots are not exact multiple of rotor slots.