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Engineering Materials in EE

Engineering Materials in EE
Which of following material has least value of dielectric constant?

  Paper.
  Oil.
  Ceramics.
  Glass.

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Engineering Materials in EE
Positive magnetostriction exists when

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

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Engineering Materials in EE
When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as

 poly crystalline.
 semi-magnetic.
 paramagnetic.
 anti-ferromagnetic.

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

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

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

All of these
 High magnetic permeability.
 Large hysteresis loop.
 High electrical resistivity.

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

 none of these.
 Less than 1
 1.
 0.

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