electrical engineering materials MCQs – Page 2

Practise focused electrical engineering materials questions with marked answers for exam preparation and subject revision.

electrical engineering materials Mcqs
21. High resistivity materials are used in_____________?
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A. all of the above

B. heating elements

C. incandescent lamps

D. precision instruments

E. motor starters

22. Commonly used conducting materials are_____________?
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A. copper

B. aluminium

C. both (A) and (B)

D. copper and silver

E. platinum and gold

23. Spark plug makes use of which of the following materials for insulation ?
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A. Glass

B. Asbestos

C. Porcelain

D. Slate

24. The co-ordination number of a simple cubic structure is______________?
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A. 2

B. 6

C. 4

D. 8

25. Mercury as an electric contact material is_______________?
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A. a liquid

B. a metal

C. a metal liquid

D. a gas

26. Solder is an alloy of______________?
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A. nickel, copper and zinc

B. silver, copper and lead

C. copper and aluminium

D. tin and lead
27. highest conductivity_____________?
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A. all of the above

B. easy solderable and drawable quality

C. lowest temperature co-efficient

D. good corrosion resistance

E. good mechanical strength

28. The conduction of electricity, in semiconductors, takes place due to movement of______________?
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A. negative ions only

B. positive and negative ions

C. electrons and holes

D. positive ions only

29. Selenium is __________ semiconductor?
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A. P-type

B. N-type

C. extrnisic

D. intmisic
30. On which of the following factors does the resistivity of a material depend ?
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A. Length of the conductor

B. Resistance of the conductor

C. All of the above

D. Area of the conductor section

31. Which of the following material is not a semiconductor ?
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A. Gallium-arsenide

B. Selenium

C. Germanium

D. Silica
32. Surface resistance of an insulating material is reduced due to the______________?
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A. smoky and dirty atmosphere

B. humidity in the atmosphere

C. both (A) and (b)

D. neither (A) nor (b)

33. ___________ has the best damping properties?
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A. Diamond

B. High speed steel

C. Mild steel

D. Cast iron
34. Thermocouples are mainly used for the measurement of_____________?
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A. eddy currents

B. resistance

C. coupling co-efficient

D. temperature
35. Steel wire is used as____________?
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A. core wire of ACSR

B. earth wire

C. overhead telephone wire

D. all of the above
36. The minority carrier concentration is largely a function of_____________?
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A. temperature

B. reverse biasing voltage

C. the amount of doping

D. forward biasing voltage

37. Carbon resistors are used extensively because they are____________?
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A. compact

B. inexpensive

C. all of the above reasons

D. easy to make

38. _________ is an example of piezoelectric material?
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A. Glass

B. Quartz

C. Neoprene

D. Corrundum

39. Carbon bearings are used under which of the following conditions ?
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A. Where corrosive chemical action exists

B. All of the above

C. Where high temperature exists

D. Where lubrication is difficult or im-possible

40. __________ is a hard solder?
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A. Copper-zinc

B. Tin-lead

C. None of the above

D. Tin-silver-lead