ENGINEERING MATERIALS IN EE QUIZ

The materials which exhibit the same elastic properties in all directions are called

isotropic.

isentropic.

visco elastic.

inelastic.

TRUE ANSWER : ?
YOUR ANSWER : ?

The electron configuration of sulfur atom is

2, 8, 2.

1s2 , 2s2 2p6, 3s2 3p6.

none of these.

2, 8, 6.

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In ferromagnetic materials

the atomic magnetic moments are antiparallel and unequal.

one of the constituent is iron.

the constituent is only iron.

the atomic magnetic moments are parallel.

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It is difficult to magnetize steel because it has

high permittivity.

high permeability.

low susceptibility.

low permeability.

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Indicate which of following material does not retain magnetism permanently

stainless steel.

hardness steel.

soft iron.

none of above.

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Absolute permittivity of a dielectric medium is represented by

εoεr.

None of these

εo / εr.

εr / εo.

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In order to minimise loss due to hysteresis, the magnetic material should have

high resistivity.

large B-H loop area.

high retentivity.

low hysteresis coefficient.

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Susceptibility is negative for

non magnetic substances.

none of above.

ferromagnetic substances.

diamagnetic substances.

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Maximum number of electrons in a sub-shell with l = 3 and n = 4 is

14.

8.

20.

10.

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Which of the following is the least desired property in magnetic materials for electrical engineering applications ?

High magnetic permeability.

All of these

High electrical resistivity.

Large hysteresis loop.

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YOUR ANSWER : ?

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