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Engineering Materials in EE

Engineering Materials in EE
Almost the entire mass of an atom is concentrated in the

 nucleus.
 neutrons.
 electrons.
 protons.

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

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

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Engineering Materials in EE
A ferrite core has low eddy current loss than an iron core because

 ferrites are magnetic.
 ferrites have low permeability.
 ferrites have hig hysteresis.
 / >ferrites have high resistance.

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Engineering Materials in EE
The temperature beyond which substances lose their ferroelectric properties, is known as

 inversion temperature.
 critical temperature.
 conversion temperature.
 curie temperature.

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Engineering Materials in EE
In ferromagnetic materials

 one of the constituent is iron.
 the atomic magnetic moments are parallel.
 the atomic magnetic moments are antiparallel and unequal.
 the constituent is only iron.

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Engineering Materials in EE
The permeability of iron can be increased by

 purifying it.
 reducing carbon percentage.
 increasing carbon percentage.
 alloying with cobalt.

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