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Engineering Materials in EE

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

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

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Engineering Materials in EE
ALNICO is an alloy of

 iron, cobalt, nickel.
 aluminium, nickel.
 iron, aluminium.
 aluminium, nickel, iron and cobalt.

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Engineering Materials in EE
A ferrite core has low eddy current loss than an iron core because

 ferrites have hig hysteresis.
 ferrites have low permeability.
 / >ferrites have high resistance.
 ferrites are magnetic.

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Engineering Materials in EE
Dielectric constant for vacuum is

  0.
  infinity.
  1.
 100.

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

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

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Engineering Materials in EE
How many valence electrons would be found in an atom with the atomic number of 51?

 8.
 none of above.
 5.
 51.

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