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Engineering Materials in EE

Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

 dia-magnetic.
 semi-magnetic.
None of these
 ferro-magnectic.

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

 Oxygen.
 Carbon.
 Nitrogen.
 Sulphur.

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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
 Potassium niobate
 Copper

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Engineering Materials in EE
Materials having a high dielectric constant, which is non-linear, are known as

 super die-electrics.
 hard die-electrics.
 ferroelectric materials.
 elastomers.

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

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

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Engineering Materials in EE
Cryogenics is a branch of science dealing with which of the following?

 High temperature.
 Friction and wear.
  Low temperature.
 Crystal growth.

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