Question # 1

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

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

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Capacitor

Commutator

Resistor

Inductor

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

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

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

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Increases

Decreases

Remain constant

Zero

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

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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

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Transforms

AC generator

Alevator

Dynamo

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

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