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Engineering Materials in EE

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

 200.
  3 to 8.
 100.
 1 to 2.

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Engineering Materials in EE
The magnetisation and applied field in ferromagnetic materials are related

 sinusoidally.
 parabolically.
 linearly.
 non linearly.

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

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

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Engineering Materials in EE
The dielectric strength of ferroelectric materials depends to a large extent on

 presence of magnetic materials in the vicinity.
 area of hysteresis loop for the material.
 intensity of electric field.
 frequency of applied voltage.

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Engineering Materials in EE
The intensity of magnetization, M, of a ferro magnetic solid

 decreases with increasing temperature.
 depends on method of heating.
 increases with increasing temperature.
 is independent of temperature.

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

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

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