Question # 1

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

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

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 back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The induction can be increased by winding the wire around a core made of.

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Copper

Silicon

Iron

Aluminum

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

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

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

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

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Transforms

AC generator

Alevator

Dynamo

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

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Carbon burshes

Coil

Commutator

Magnetic field

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

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