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Engineering Materials in EE

Engineering Materials in EE
Absolute permittivity of a dielectric medium is represented by

None of these
 εo / εr.
 εr / εo.
 εoεr.

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Engineering Materials in EE
Choose the best suitable of Diamagnetic : Paramagnetic::

 Iron : Steel.
 Water : Air.
 Nickel : Cobalt.
 Permalloy : Super-alloy.

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Engineering Materials in EE
Positive magnetostriction exists when

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

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

  Oil.
  Glass.
  Paper.
  Ceramics.

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Engineering Materials in EE
The core of a transformer for microwave frequency should be made of

  silicon.
  silicon carbide.
 iron.
  ferrites.

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Engineering Materials in EE
Dielectric constant for vacuum is

  infinity.
  0.
  1.
 100.

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