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Engineering Materials in EE

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

 Porcelain.
 Mica.
 All of these.
 Glass.

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Engineering Materials in EE
What is the dielectric constant of mica ?

 100.
 1 to 2.
  3 to 8.
 200.

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Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magneto-calorisation.
 magnetostriction.
 magnetic hysteresis.
 magnetic expansion.

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

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

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Engineering Materials in EE
The magnetisation and applied field in ferromagnetic materials are related

 linearly.
 parabolically.
 non linearly.
 sinusoidally.

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Engineering Materials in EE
Positive magnetostriction exists when

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

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MORE MCQ ON Engineering Materials in EE

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