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Electromagnetic Induction

Study 85 Electrical Engineering MCQs with correct answers and explanations.

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41Electrical EngineeringMedium

The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________?

B3-Jan

Correct answer

A. 3

Explanation

The correct answer is 3.

42Electrical EngineeringMedium

The magnitude of the induced e.m.f. in a conductor depends on the________?

Arate of change of flux-linkages

Bflux density of the magnetic field

Camount of flux linkages

Damount of flux cut

Correct answer

A. rate of change of flux-linkages

Explanation

The correct answer is rate of change of flux-linkages.

43Electrical EngineeringMedium

Air-core coils are practically free from________?

Aboth (A) and (B)

Bhysteresis losses

Cnone of the above

Deddy current losses

Correct answer

A. both (A) and (B)

Explanation

The correct answer is both (A) and (B).

44Electrical EngineeringMedium

For long distance transmission the transformer used is________?

AAmplifier is used

BStep up

CStep down

DInput voltage and output voltage remain same

Correct answer

B. Step up

Explanation

The correct answer is Step up.

45Electrical EngineeringMedium

Self-inductance of a long solenoid is________?

AμoN2

BμoN2/A

CμoN2A

DBA

Correct answer

C. μoN2A

Explanation

The correct answer is μoN2A.

46Electrical EngineeringMedium

Current produced by moving the loop of wire across a magnetic field is called________?

AD.C current

Binduced current

CA.C current

Dmean square current

Correct answer

B. induced current

Explanation

The correct answer is induced current.

47Electrical EngineeringMedium

A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?

A0.5 s

B5 s

C0.01 s

D0.1 s

Correct answer

A. 0.5 s

Explanation

The correct answer is 0.5 s.

48Electrical EngineeringMedium

An alternating current or voltage________?

Achanges its direction again and again

Bchanges its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Cvaries in magnitude alone

Dfluctuates off and on

Correct answer

B. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Explanation

The correct answer is changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals..

49Electrical EngineeringMedium

Inductors acts as a short circuit for________?

ABoth A and B

BAC

Cnone of these

DDC

Correct answer

D. DC

Explanation

The correct answer is DC.

50Electrical EngineeringMedium

Which one of the following devices does not function like an electric motor?

ATransformer

BVoltmeter

CAmmeter

DGalvanometer

Correct answer

A. Transformer

Explanation

The correct answer is Transformer.

An alternating current or voltage________?

Achanges its direction again and again

Bchanges its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Cvaries in magnitude alone

Dfluctuates off and on

Correct answer

B. changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Explanation

The correct answer is changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals..