Question # 1

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

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Armature

Magnet

Slip rings

Commutator

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

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

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

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Transforms

AC generator

Alevator

Dynamo

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

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

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

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

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Capacitor

Commutator

Resistor

Inductor

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

Unit of self inductance is

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Weber

Tesla

Henry

Farad

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