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Engineering Materials in EE

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

 non linearly.
 parabolically.
 linearly.
 sinusoidally.

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Engineering Materials in EE
Which of the following gives materials in order of decreasing values of permeability?

 Silver, copper, aluminium, iron.
 Pure iron, silicon iron, aluminium, bismuth.
 Cobalt, nickel, aluminium, iron.
  Permalloy, nickel, air, water.

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

 Lead zirconate titanate
 Potassium niobate
None of these
 Copper

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Engineering Materials in EE
Which of the following is the ferroelectric material ?

 Potassium dihydrogen phosphate.
 Rochelle salt.
All of these
 Barium titanate.

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

 2.
 7.
 4.
 12.

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Engineering Materials in EE
What is the value of dielectric constant of air?

 none of these.
 1.
 0.
 Less than 1

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