Question # 1

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

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

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Carbon burshes

Coil

Commutator

Magnetic field

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

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

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Charge

Momentum

Energy

Angular momentum

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

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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

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

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

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

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Decreases

Becomes zero

Increases

Remains constant

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

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

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

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 unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

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