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Electrical Engineering Materials - Interview Questions and Answers

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51. Which of the following high resistance materials has the highest operating temperature ?
A. Kanthal
B. Manganin
C. Nichrome
D. Eureka
Explanation:
52. The resistivity of a metal is a function of temperature because
A. the amplitude of vibration of the atoms varies with temperature
B. the electron density varies with temperature
C. the electron gas density varies with temperature
D. the amplitude of vibration of the atoms varies with temperature
Explanation:
53. Substances whose specific resistance abruptly decreases at very low temperature are called
A. insulators
B. conductors
C. semiconductors
D. superconductors
Explanation:
54. Which of the following material is not a semiconductor ?
A. Silica
B. Germanium
C. Selenium
D. Gallium-arsenide
Explanation:
55. Selenium is _____ semiconductor.
A. extrnisic
B. intmisic
C. N-type
D. P-type
Explanation:
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