Question # 1

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

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Increases

Decreases

Remain constant

Zero

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

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 the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

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

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

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

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

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

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Zero

High

Low

May be high or low

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