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Engineering Materials in EE

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

 lead.
 copper.
 aluminium.
 pure iron.

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Engineering Materials in EE
Permittivity of free space is equal to

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

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Engineering Materials in EE
The permanent magnets are made from which of following materials ?

 Ferromagnetic.
 Paramagnetic.
 Diamagnetic.
 Soft iron.

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Engineering Materials in EE
Materials having a high dielectric constant, which is non-linear, are known as

 hard die-electrics.
 super die-electrics.
 ferroelectric materials.
 elastomers.

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

  silicon.
 iron.
  silicon carbide.
  ferrites.

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Engineering Materials in EE
Susceptibility is negative for

 diamagnetic substances.
 none of above.
 non magnetic substances.
 ferromagnetic substances.

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MORE MCQ ON Engineering Materials in EE

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