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

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

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

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Armature

Magnet

Slip rings

Commutator

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

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

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

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

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

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