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Electrical Engineering Materials - Interview Questions and Answers

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71. The current due to electron flow in conduction band is the hole current in valence band.
A. equal to
B. less than
C. greater than
D. any of the above
Explanation:
72. For a hole which of the following statements is incorrect ?
A. Holes can exist in certain semicon-ductors only
B. Holes can exist in any material in-cluding conductors
C. Holes may constitute an electric current
D. Holes can be considered as a net positive charge
Explanation:
73. In conductors conduction of electricity takes place due to movement of
A. electrons only
B. positive ions only
C. negative ions only
D. positive and negative ions
Explanation:
74. The conductivity of an extrinsic semiconductor with temperature
A. decreases
B. increases
C. remains constant
D. none of the above
Explanation:
75. For a particular material the Hall coefficient was found to be zero. The material is
A. insulator
B. metal
C. intrinsic semiconductor
D. none of the above
Explanation:
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