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Engineering Materials in EE

Engineering Materials in EE
The atomic radius in case of face centered cubic lattice is

 a / 3.
 a / 2.
 a.
 a / 4.

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Engineering Materials in EE
Which of the following is the least desired property in magnetic materials for electrical engineering applications ?

 High magnetic permeability.
 Large hysteresis loop.
 High electrical resistivity.
All of these

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Engineering Materials in EE
What is the name of the fluorescent material that gives red colour fluorescence?

 Zinc sulphide.
 Calcium silicate.
  Magnesium silicate.
 Zinc silicate.

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

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

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

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

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Engineering Materials in EE
How many classes of insulating materials are there?

 7.
 6.
 8.
 5.

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