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Electrical Engineering Materials - Interview Questions and Answers

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61. is the property of absorbing moisture from atmosphere.
A. Solubility
B. Viscosity
C. Porosity
D. Hygroscopicity
Explanation:
62. The conduction of electricity, in semiconductors, takes place due to movement of
A. positive ions only
B. negative ions only
C. positive and negative ions
D. electrons and holes
Explanation:
63. Which of the following is a semiconductor material ?
A. Phosphorous
B. Rubber
C. Silicon
D. Aluminium
Explanation:
64. Copper, even though costly, finds use in the windings of electrical machines because
A. copper points offer low contact resistance
B. copper can be easily soldered and welded
C. copper windings are less bulky and the machines become compact
D. all of the above
Explanation:
65. Carbon bearings are used under which of the following conditions ?
A. Where lubrication is difficult or im-possible
B. Where corrosive chemical action exists
C. Where high temperature exists
D. All of the above
Explanation:
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