MAGNETIC CIRCUIT QUIZ

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs

70

500

50

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Hard steel is suitable for making permanent magnets because

Its hysteresis loop has large area

Its mechanical strength is high

Its mechanical strength is low

It has good residual magnetism

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YOUR ANSWER : ?

The relative permeability of a ferromagnetic material is

More than 100 Ωr 1000

Less than one

More than 10

More than one

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Relative permeability of vacuum is

3

6

5

1

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Ferrites have high hysteresis

Ferrites have high resistance

None of the listed here

Ferrites have high resistance

Ferrites have low permeability

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YOUR ANSWER : ?

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

Small

None of the listed here

Large

Zero

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Hysteresis loss least depends on

Frequency

Ambient temperature

Steinmetz’s coefficient of material

Volume of material

TRUE ANSWER : ?
YOUR ANSWER : ?

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?

E.M.F

Conductivity

Current density

Current

TRUE ANSWER : ?
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Those materials are well suited for making permanent magnets which have retentivity and coercivity.

Low, low

Low, high

High, high

High, low

TRUE ANSWER : ?
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Energy stored by a coil is doubled when its current is increased by percent.

44.6

42.5

41.4

47.5

TRUE ANSWER : ?
YOUR ANSWER : ?

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