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Engineering Materials in EE

Engineering Materials in EE
The numberof atoms per unit cell in a B.C.C structure is

 4.
 12.
 2.
 7.

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Engineering Materials in EE
According to the Bohr model, an electron gains or losses energy only by

 moving faster or slower in an allowed orbit.
 being completely removed from an atom.
 jumping from one allowed orbit to another.
 jumping from one atom to another atom.

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Engineering Materials in EE
Positive magnetostriction exists when

 dipoles are repel other.
 both are correct.
 none of above.
 dipoles are attract each other.

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Engineering Materials in EE
A degaussing is the process of

 removal of magnetic impurities.
 removing gases from materials.
 demagnetising metallic parts.
 remagnetising metallic parts.

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

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

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

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

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