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Engineering Materials in EE

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

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

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Engineering Materials in EE
Which of following material has least value of dielectric constant?

  Ceramics.
  Glass.
  Oil.
  Paper.

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Engineering Materials in EE
Choose the best suitable of Diamagnetic : Paramagnetic::

 Iron : Steel.
 Nickel : Cobalt.
 Permalloy : Super-alloy.
 Water : Air.

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Engineering Materials in EE
Maximum number of electrons in a sub-shell with l = 3 and n = 4 is

 20.
 14.
 10.
 8.

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Engineering Materials in EE
In order to minimise loss due to hysteresis, the magnetic material should have

  large B-H loop area.
  high retentivity.
  high resistivity.
  low hysteresis coefficient.

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Engineering Materials in EE
Absolute permittivity of a dielectric medium is represented by

 εo / εr.
 εr / εo.
None of these
 εoεr.

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