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Engineering Materials in EE

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

 Glass.
 All of these.
 Mica.
 Porcelain.

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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
A ferrite core has low eddy current loss than an iron core because

 ferrites have low permeability.
 ferrites are magnetic.
 / >ferrites have high resistance.
 ferrites have hig hysteresis.

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Engineering Materials in EE
A degaussing is the process of

 demagnetising metallic parts.
 removing gases from materials.
 removal of magnetic impurities.
 remagnetising metallic parts.

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

 non linearly.
 sinusoidally.
 linearly.
 parabolically.

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Engineering Materials in EE
________ is the most detrimental impurity in the magnetic materials

 Carbon.
 Oxygen.
 Sulphur.
 Nitrogen.

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MORE MCQ ON Engineering Materials in EE

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