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Electromagnetic Induction

Study 85 Electrical Engineering MCQs with correct answers and explanations.

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21Electrical EngineeringMedium

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be________?

A38 mH

B32 mH

C48 mH

D40 mH

Correct answer

A. 38 mH

Explanation

The correct answer is 38 mH.

22Electrical 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.

23Electrical EngineeringMedium

A crack in the magnetic path of an inductor will result in________?

Azero inductance

Bincreased inductance

Creduced inductance

Dunchanged inductance

Correct answer

C. reduced inductance

Explanation

The correct answer is reduced inductance.

24Electrical EngineeringMedium

A.C cannot be used for________?

Amagnetizing and electroplating

Bproducing light

Call the above

Dproducing heat

Correct answer

A. magnetizing and electroplating

Explanation

The correct answer is magnetizing and electroplating.

25Electrical EngineeringMedium

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be________?

A10 V

B50V

C25V

D15 V

Correct answer

C. 25V

Explanation

The correct answer is 25V.

26Electrical EngineeringMedium

Magnetic compass needle will be deflecting if it is kept near________?

ASemi-conductor

BSoft iron

CAccelerating charge

DStatic charge

Correct answer

C. Accelerating charge

Explanation

The correct answer is Accelerating charge.

27Electrical EngineeringMedium

The co-efficient of coupling between two air core coils depends on________?

Amutual inductance and self inductance of two coils

Bnone of the above

Cmutual inductance between two coils only

Dself-inductance of two coils only

Correct answer

A. mutual inductance and self inductance of two coils

Explanation

The correct answer is mutual inductance and self inductance of two coils.

28Electrical EngineeringMedium

A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is________?

A3.125 volt

B0 volt

C0.03125 volt

D31.25 volt

Correct answer

C. 0.03125 volt

Explanation

The correct answer is 0.03125 volt.

29Electrical EngineeringMedium

The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as________?

Aself-inductance

Bcapacitance

Cmutual inductance

Dseries aiding inductance

Correct answer

A. self-inductance

Explanation

The correct answer is self-inductance.

30Electrical EngineeringMedium

A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly________?

A240 N

B50 N

C480 N

D120 N

Correct answer

D. 120 N

Explanation

The correct answer is 120 N.

21Electrical EngineeringMedium

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be________?

A38 mH

B32 mH

C48 mH

D40 mH

Correct answer

A. 38 mH

Explanation

The correct answer is 38 mH.

22Electrical 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.

23Electrical EngineeringMedium

A crack in the magnetic path of an inductor will result in________?

Azero inductance

Bincreased inductance

Creduced inductance

Dunchanged inductance

Correct answer

C. reduced inductance

Explanation

The correct answer is reduced inductance.

24Electrical EngineeringMedium

A.C cannot be used for________?

Amagnetizing and electroplating

Bproducing light

Call the above

Dproducing heat

Correct answer

A. magnetizing and electroplating

Explanation

The correct answer is magnetizing and electroplating.

25Electrical EngineeringMedium

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be________?

A10 V

B50V

C25V

D15 V

Correct answer

C. 25V

Explanation

The correct answer is 25V.

26Electrical EngineeringMedium

Magnetic compass needle will be deflecting if it is kept near________?

ASemi-conductor

BSoft iron

CAccelerating charge

DStatic charge

Correct answer

C. Accelerating charge

Explanation

The correct answer is Accelerating charge.

27Electrical EngineeringMedium

The co-efficient of coupling between two air core coils depends on________?

Amutual inductance and self inductance of two coils

Bnone of the above

Cmutual inductance between two coils only

Dself-inductance of two coils only

Correct answer

A. mutual inductance and self inductance of two coils

Explanation

The correct answer is mutual inductance and self inductance of two coils.

28Electrical EngineeringMedium

A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is________?

A3.125 volt

B0 volt

C0.03125 volt

D31.25 volt

Correct answer

C. 0.03125 volt

Explanation

The correct answer is 0.03125 volt.

29Electrical EngineeringMedium

The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as________?

Aself-inductance

Bcapacitance

Cmutual inductance

Dseries aiding inductance

Correct answer

A. self-inductance

Explanation

The correct answer is self-inductance.

30Electrical EngineeringMedium

A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly________?

A240 N

B50 N

C480 N

D120 N

Correct answer

D. 120 N

Explanation

The correct answer is 120 N.