Question # 1

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

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

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Charge

Momentum

Energy

Angular momentum

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

The motional emf is give by

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qvB

IBL

eBL

vBL

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

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

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

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Decreased

Increased

Vanishes

Remain constant

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

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

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Carbon burshes

Coil

Commutator

Magnetic field

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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

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Decreases

Becomes zero

Increases

Remains constant

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

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