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Engineering Materials in EE

Engineering Materials in EE
Dielectric constant for vacuum is

  infinity.
  1.
  0.
 100.

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Engineering Materials in EE
In electrical machines the material preferred for pole shoes of electromagnets is

 lead.
 pure iron.
 aluminium.
 copper.

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Engineering Materials in EE
The permeability of iron can be increased by

 increasing carbon percentage.
 alloying with cobalt.
 purifying it.
 reducing carbon percentage.

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

 4.
 7.
 2.
 12.

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Engineering Materials in EE
The temperature beyond which substances lose their ferroelectric properties, is known as

 critical temperature.
 conversion temperature.
 curie temperature.
 inversion temperature.

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

 none of these.
 0.
 Less than 1
 1.

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