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Engineering Materials in EE

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

 pure iron.
 copper.
 aluminium.
 lead.

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Engineering Materials in EE
What is the value of dielectric constant of air?

 none of these.
 0.
 Less than 1
 1.

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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 material with unequal anti-parallel atomic magnetic moments is

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

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Engineering Materials in EE
Cryogenics is a branch of science dealing with which of the following?

  Low temperature.
 Crystal growth.
 High temperature.
 Friction and wear.

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

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

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