Question # 1

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

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

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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

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Commutator

Rotor

Armature

Detector

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What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

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

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

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

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

The magnitude of motional emf is given by

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1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

DC generator by william Sturgeon in:

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1894

1961

1834

1961

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

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