Question # 1

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

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

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

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

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

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

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Current

Voltage

Power

Heat

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

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Carbon burshes

Coil

Commutator

Magnetic field

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

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

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

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The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Unit of self inductance is

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Weber

Tesla

Henry

Farad

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