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Engineering Materials in EE

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
The magnetisation and applied field in ferromagnetic materials are related

 sinusoidally.
 linearly.
 parabolically.
 non linearly.

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

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

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Engineering Materials in EE
Which of the following statements is not part of Daltons atomic theory?

 Atoms can combine to form compounds.
 Atoms of different elements are quite different.
 An atom contains a dense central nucleus.
 All matter is composed of atoms.

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

 0.
 1.
 none of these.
 Less than 1

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Engineering Materials in EE
Indicate which of following material does not retain magnetism permanently

 stainless steel.
 none of above.
 soft iron.
 hardness steel.

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