ENGINEERING MATERIALS IN EE QUIZ

Positive magnetostriction exists when

dipoles are repel other.

both are correct.

dipoles are attract each other.

none of above.

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Indicate which of following material does not retain magnetism permanently

soft iron.

stainless steel.

hardness steel.

none of above.

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What are insulating materials that can tolerate maximum temperature?

Mica.

Glass.

Porcelain.

All of these.

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Materials which lack permanent magnetic dipoles are called

None of these

ferro-magnectic.

semi-magnetic.

dia-magnetic.

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ALNICO is an alloy of

aluminium, nickel, iron and cobalt.

aluminium, nickel.

iron, aluminium.

iron, cobalt, nickel.

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When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

magnetic expansion.

magnetostriction.

magneto-calorisation.

magnetic hysteresis.

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In ferromagnetic materials

the constituent is only iron.

the atomic magnetic moments are antiparallel and unequal.

the atomic magnetic moments are parallel.

one of the constituent is iron.

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The numberof atoms per unit cell in a B.C.C structure is

7.

4.

2.

12.

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Substance having permeability less than the permeability of free space, are known as

diamagnetic.

bipolar.

paramagnetic.

ferromagnetic.

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It is difficult to magnetize steel because it has

high permittivity.

low permeability.

high permeability.

low susceptibility.

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