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Electromagnetic Induction

Study 85 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

Long distance transmission is easy for________?

AA.C voltage

BHalf A.C voltage

CHalf D.C voltage

DD.C voltage

Correct answer

A. A.C voltage

Explanation

The correct answer is A.C voltage.

12Electrical EngineeringMedium

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________?

Avariation in coil current

Bthe resistance of magnetic path

Cchange of number of turns of coil

Dvariation in voltage to the coil

Correct answer

D. variation in voltage to the coil

Explanation

The correct answer is variation in voltage to the coil.

13Electrical EngineeringMedium

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is________?

A0.2 Wb

B0.02 Wb

C2 Wb

D20 Wb

Correct answer

B. 0.02 Wb

Explanation

The correct answer is 0.02 Wb.

14Electrical EngineeringMedium

The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to________?

ATorque

BMutual induction

CMagnetic flux density

DMotional emf

Correct answer

C. Magnetic flux density

Explanation

The correct answer is Magnetic flux density.

15Electrical EngineeringMedium

When the motor is at its maximum speed then back emf will be________?

ANo back emf

BZero

CIntermediate values

DMaximum

Correct answer

D. Maximum

Explanation

The correct answer is Maximum.

16Electrical EngineeringMedium

Self inductance of a coil depends upon________?

Avoltage produce

Bnumber of turns per unit length

Ccurrent flowing

Dall

Correct answer

D. all

Explanation

The correct answer is all.

17Electrical EngineeringMedium

Weber is the unit of________?

Amagnetic flux

Bself-inductance

Cmagnetic induction

DMagnetic field intensity

Correct answer

A. magnetic flux

Explanation

The correct answer is magnetic flux.

18Electrical EngineeringMedium

Which circuit element(s) will oppose the change in circuit current?

AInductance and capacitance

BCapacitance only

CInductance only

DResistance only

Correct answer

C. Inductance only

Explanation

The correct answer is Inductance only.

19Electrical EngineeringMedium

A.C can not be used for________?

Aproducing light

Bproducing heat

CMagnetizing iron

DProducing magnetic field

Correct answer

C. Magnetizing iron

Explanation

The correct answer is Magnetizing iron.

20Electrical EngineeringMedium

Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is________?

A5 H

B10 mH

C10 H

D5 mH

Correct answer

A. 5 H

Explanation

The correct answer is 5 H.

11Electrical EngineeringMedium

Long distance transmission is easy for________?

AA.C voltage

BHalf A.C voltage

CHalf D.C voltage

DD.C voltage

Correct answer

A. A.C voltage

Explanation

The correct answer is A.C voltage.

12Electrical EngineeringMedium

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________?

Avariation in coil current

Bthe resistance of magnetic path

Cchange of number of turns of coil

Dvariation in voltage to the coil

Correct answer

D. variation in voltage to the coil

Explanation

The correct answer is variation in voltage to the coil.

13Electrical EngineeringMedium

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is________?

A0.2 Wb

B0.02 Wb

C2 Wb

D20 Wb

Correct answer

B. 0.02 Wb

Explanation

The correct answer is 0.02 Wb.

14Electrical EngineeringMedium

The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to________?

ATorque

BMutual induction

CMagnetic flux density

DMotional emf

Correct answer

C. Magnetic flux density

Explanation

The correct answer is Magnetic flux density.

15Electrical EngineeringMedium

When the motor is at its maximum speed then back emf will be________?

ANo back emf

BZero

CIntermediate values

DMaximum

Correct answer

D. Maximum

Explanation

The correct answer is Maximum.

16Electrical EngineeringMedium

Self inductance of a coil depends upon________?

Avoltage produce

Bnumber of turns per unit length

Ccurrent flowing

Dall

Correct answer

D. all

Explanation

The correct answer is all.

17Electrical EngineeringMedium

Weber is the unit of________?

Amagnetic flux

Bself-inductance

Cmagnetic induction

DMagnetic field intensity

Correct answer

A. magnetic flux

Explanation

The correct answer is magnetic flux.

18Electrical EngineeringMedium

Which circuit element(s) will oppose the change in circuit current?

AInductance and capacitance

BCapacitance only

CInductance only

DResistance only

Correct answer

C. Inductance only

Explanation

The correct answer is Inductance only.

19Electrical EngineeringMedium

A.C can not be used for________?

Aproducing light

Bproducing heat

CMagnetizing iron

DProducing magnetic field

Correct answer

C. Magnetizing iron

Explanation

The correct answer is Magnetizing iron.

20Electrical EngineeringMedium

Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is________?

A5 H

B10 mH

C10 H

D5 mH

Correct answer

A. 5 H

Explanation

The correct answer is 5 H.