MAGNETIC CIRCUIT QUIZ

A material for good magnetic memory should have

High retentivity

High permeability

Low retentivity

Low hysteresis loss

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The unit of magnetic flux is

Ampere/metre

Henry

Weber

Ampere-turn/weber

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When both the inductance and resistance of a coil are doubled the value of

Time constant is halved

Time constant remains unchanged

Initial rate of rise of current is doubled

Final steady current is doubled

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The unit of reluctance is

Meter/Henry

Henry/meter

1/Henry

Henry

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The unit of retentivity is

Ampere turns

Ampere turn/meter

Weber/sq. m

Weber

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Reciprocal of reluctance is

Permeability

Susceptibility

Reluctivity

Permeance

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Relative permeability of vacuum is

6

1

3

5

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An air gap is usually inserted in magnetic circuits to

None of the listed here

Increase the flux

Increase m.m.f.

Prevent saturation

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Energy stored by a coil is doubled when its current is increased by percent.

44.6

41.4

47.5

42.5

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In a magnetic material hysteresis loss takes place primarily due to

Flux density lagging behind magnetizing force

Molecular friction

It high retentivity

Rapid reversals of its magnetization

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