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Engineering Materials in EE

Engineering Materials in EE
________ is the most detrimental impurity in the magnetic materials

 Nitrogen.
 Carbon.
 Sulphur.
 Oxygen.

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Engineering Materials in EE
A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

 alternating.
 rotating.
 pulsating.
 / >(A), (B), and (C) are all correct.

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Engineering Materials in EE
Which of the following is the example for piezo-electric material ?

None of these
 Lead zirconate titanate
 Copper
 Potassium niobate

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

 2.
 7.
 12.
 4.

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Engineering Materials in EE
Substance having permeability less than the permeability of free space, are known as

 paramagnetic.
 diamagnetic.
 bipolar.
 ferromagnetic.

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

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

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