Electro-magnetic Induction Mcqs

This set of Electrical engineering Multiple Choice Questions and Answers (MCQs) focuses on study of “Electro-magnetic Induction”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our Mcqs to assimilate Electro-magnetic Induction comprehensively.

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1.
An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

150msec-1

384msec-1

38.4msec-1

200msec-1

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2.
Non inductive resistances are used in decreasing______________?

Mutual inductance

Self inductance

Magnetic fields

Heating effect

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3.
Which one of the following devices does not function like an electric motor ?

Galvanometer

Ammeter

Voltmeter

Transformer

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4.
For long distance transmission the transformer used is_____________?

Step down

Input voltage and output voltage remain same

Step up

Amplifier is used

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5.
Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?

Retaintivity

Permeability

Flux

Hysteresis

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6.
When the motor is at its maximum speed then back emf will be______________?

Maximum

Zero

Intermediate values

No back emf

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7.
Transformer works on the principle of________________?

Lenzs law

Faradays law

Mutual induction

Law of conservation of power

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8.
An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?

Induced current

Eddy current

Back emf

None of the above

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9.
The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?

3-Jan

3

1

6

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10.
Long distance transmission is easy for________________?

D.C voltage

A.C voltage

Half A.C voltage

Half D.C voltage

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11.
Magnetic compass needle will be deflecting if it is kept near________________?

Static charge

Soft iron

Semi-conductor

Accelerating charge

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12.
A.C can not be used for_______________?

Producing heat

Producing light

Magnetizing iron

Producing magnetic field

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13.
A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?

A torque about horizontal axis

A torque about vertical axis

An upward force along the axis

No resultant force

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14.
The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?

Magnetic flux density

Torque

Mutual induction

Motional emf

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15.
The emf induced in a coil by a changing magnetic flux may have unit as______________?

Ms-1A

Ms-2A-1

Kgms2A-1

Kgm2s-1A-1

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