Question # 1

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

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

Self inductance of a long solenoid is given by

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None of the above

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

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

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Current

Voltage

Power

Heat

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

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Capacitor

Commutator

Resistor

Inductor

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

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Lenz's law

Faraday's law

Ampere's law

None of these

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

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Decreases

Becomes zero

Increases

Remains constant

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

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

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Transforms

AC generator

Alevator

Dynamo

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