Question # 1

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

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

DC generator by william Sturgeon in:

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1894

1961

1834

1961

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

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

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Capacitor

Commutator

Resistor

Inductor

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

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

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

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

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