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Electrical Engineering Materials - Interview Questions and Answers

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21. A carbon resistor contains
A. carbon crystals
B. solid carbon granules
C. pulverized coal
D. finely divided carbon black.
Explanation:
22. _____ is a hard solder.
A. Tin-lead
B. Tin-silver-lead
C. Copper-zinc
D. None of the above
Explanation:
23. By increasing impurity content in the metal alloy the residual resistivity always
A. decreases
B. increases
C. remains constant
D. becomes temperature independent
Explanation:
24. Carbon electrodes are not used in
A. GLS lamps
B. electric arc furnace
C. dry cells
D. cinema projectors
Explanation:
25. Which of the following is the poorest conductor of electricity ?
A. Carbon
B. Steel
C. Silver
D. Aluminium
Explanation:
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