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Engineering Materials in EE

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

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

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

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

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Engineering Materials in EE
The atomic radius in case of face centered cubic lattice is

 a / 2.
 a / 3.
 a / 4.
 a.

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

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

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Engineering Materials in EE
The intensity of magnetization, M, of a ferro magnetic solid

 depends on method of heating.
 decreases with increasing temperature.
 is independent of temperature.
 increases with increasing temperature.

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

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

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