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Engineering Materials in EE

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

  silicon.
 iron.
  ferrites.
  silicon carbide.

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Engineering Materials in EE
Indicate which of following material does not retain magnetism permanently

 hardness steel.
 stainless steel.
 none of above.
 soft iron.

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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 electrical resistivity.
 High magnetic permeability.
 Large hysteresis loop.

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Engineering Materials in EE
A material with unequal anti-parallel atomic magnetic moments is

 ferrimagnet.
 a ferrite.
 non-magnetic.
 an anti-ferromagnet.

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

 2.
 7.
 12.
 4.

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Engineering Materials in EE
Permittivity of free space is equal to

 8.854 × 10 - 10 F / m.
 8.854 × 10 - 12 F / m.
 8.854 × 10 - 11 F / m.
 8.854 × 10 - 13 F / m.

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