Question # 1

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Unit of self inductance is

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Weber

Tesla

Henry

Farad

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

Self inductance of a long solenoid is given by

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None of the above

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

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