Question # 1

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

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

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

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

The motional emf is give by

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qvB

IBL

eBL

vBL

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

Lenz's law presented in

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1834

1934

1826

1836

DC generator by william Sturgeon in:

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1894

1961

1834

1961

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

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

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

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