Question # 1

Lenz's law presented in

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1834

1934

1826

1836

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

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1931

1731

1842

1831

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

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

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

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

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

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

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

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

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

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