Question # 1

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

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

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

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

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Decreased

Increased

Vanishes

Remain constant

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

The magnitude of motional emf is given by

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A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

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

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Zero

High

Low

May be high or low

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

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

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

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