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Engineering Materials in EE

Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

None of these
 semi-magnetic.
 dia-magnetic.
 ferro-magnectic.

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Engineering Materials in EE
Positive magnetostriction exists when

 both are correct.
 none of above.
 dipoles are attract each other.
 dipoles are repel other.

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Engineering Materials in EE
Find the odd one out.

 Emissivity.
 Absorptivity.
 Dielectric strength.
 Refractive index.

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Engineering Materials in EE
What is the value of dielectric constant of air?

 1.
 Less than 1
 0.
 none of these.

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Engineering Materials in EE
In ferromagnetic materials

 the constituent is only iron.
 the atomic magnetic moments are antiparallel and unequal.
 one of the constituent is iron.
 the atomic magnetic moments are parallel.

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Engineering Materials in EE
A ferrite core has low eddy current loss than an iron core because

 / >ferrites have high resistance.
 ferrites are magnetic.
 ferrites have low permeability.
 ferrites have hig hysteresis.

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