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Electrical Engineering Materials MCQs
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Electrical Engineering Materials MCQs
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25 Questions

1. Due to which of the following reasons copper and aluminium are not used for heating elements?
2. Which of the following resistive materials has the lowest temperature coefficient of resistance?
3. Which of the following are non-conductors of electricity?
4. Which of the following materials is the best conductor of electricity?
5. Steel wire is used as
6. Solder is an alloy of
7. The superconductivity is due to
8. By increasing impurity content in the metal alloy the residual resistivity always
9. The metal having the lowest temperature coefficient of resistance is
10. The conduction of electricity, in semiconductors, takes place due to movement of
11. Thermionic emission occurs in
12. Most of the common metals have _________ structure.
13. Due to which of the following factors the brush wear rate is altered?
14. The resistivity of a metal is a function of temperature because
15. Superconductivity is observed for
16. ________ has zero temperature coefficient of resistance.
17. Which of the following affect greatly the resistivity of electrical conductors?
18. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron.
19. The photoelectric effect occurs only when the incident light has more than a certain critical
20. The current due to electron flow in conduction band is the hole current in valence band.
21. A good electric contact material should have all of the following properties except
22. The coils of D.C. motor starter are wound with wire of
23. The forbidden gap in an insulator is
24. Spark plug makes use of which of the following materials for insulation?
25. Commonly used conducting materials are

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