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Electrical Engineering Materials - Interview Questions and Answers

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31. Thermonic emission occurs in
A. vacuum tubes
B. copper conductors
C. ferrite cores
D. transistors
Explanation:
32. A good electric contact material should have all of the following properties excePt
A. high resistivity
B. high resistance to corrosion
C. good thermal conductivity
D. high melting point
Explanation:
33. Solder is an alloy of
A. copper and aluminium
B. tin and lead
C. nickel, copper and zinc
D. silver, copper and lead
Explanation:
34. On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above
Explanation:
35. ______ is an example of piezoelectric material.
A. Glass
B. Quartz
C. Corrundum
D. Neoprene
Explanation:
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