Question # 1

The magnitude of motional emf is given by

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When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

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

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

The motional emf is give by

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qvB

IBL

eBL

vBL

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

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Increases

Decreases

Remain constant

Zero

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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

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Armature

Magnet

Slip rings

Commutator

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

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

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

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

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100 J

5 J

20 J

Zero

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Physics ICS Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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