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Engineering Materials in EE

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

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

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

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

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

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

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Engineering Materials in EE
Temporary magnets are used in which of the following ?

  Motors.
  Generators.
  All of these.
  Hoist.

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

 none of these.
 0.
 1.
 Less than 1

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Engineering Materials in EE
What are insulating materials that can tolerate maximum temperature?

 All of these.
 Porcelain.
 Glass.
 Mica.

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