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Engineering Materials in EE

Engineering Materials in EE
A material with unequal anti-parallel atomic magnetic moments is

 non-magnetic.
 ferrimagnet.
 an anti-ferromagnet.
 a ferrite.

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

 iron.
  silicon.
  silicon carbide.
  ferrites.

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Engineering Materials in EE
Positive magnetostriction exists when

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

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Engineering Materials in EE
Almost the entire mass of an atom is concentrated in the

 electrons.
 nucleus.
 neutrons.
 protons.

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

 1 to 2.
 100.
 200.
  3 to 8.

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Engineering Materials in EE
In Bohr’s model of atomic structure, the nucleus consists of

 protons.
 electrons and protons.
 electrons.
 protons and neutrons.

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