Question # 1

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

Commutator was invented in

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1834

1820

1840

1835

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

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 movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

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

Lenz's law presented in

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1834

1934

1826

1836

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

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

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

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Armature

Magnet

Slip rings

Commutator

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

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100 J

5 J

20 J

Zero

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

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

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's 1st rule

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

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