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Engineering Materials in EE

Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

 dia-magnetic.
 ferro-magnectic.
None of these
 semi-magnetic.

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Engineering Materials in EE
Why diamond is very hard ?

None of these
 Because of covalent solid
 Because of large cohesive energy
 Because of high melting point

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

 lead.
 aluminium.
 copper.
 pure iron.

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Engineering Materials in EE
ALNICO is an alloy of

 aluminium, nickel.
 aluminium, nickel, iron and cobalt.
 iron, cobalt, nickel.
 iron, aluminium.

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

 1 to 2.
 200.
 100.
  3 to 8.

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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 hig hysteresis.
 / >ferrites have high resistance.

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