Question # 1

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

DC generator by william Sturgeon in:

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1894

1961

1834

1961

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

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

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

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

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Armature

Magnet

Slip rings

Commutator

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

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

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