Semiconductor Physics – Exercise – 2

76. Introducing those impurity elements that have ________ valence electrons creates the n-type material.

(a) 0
(b) 3
(c) 4
(d) 5

Answer
Answer : (d)
Explanation
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77. The ac resistance of a diode is the ________ of the characteristic curve at the Q-point of operation.

(a) reciprocal of the slope
(b) slope
(c) midpoint
(d) average value

Answer
Answer : (a)
Explanation
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78. The reverse recovery time of most commercial switching diodes is in the range of ________.

(a) picoseconds
(b) a few nanoseconds
(c) several microseconds
(d) milliseconds

Answer
Answer : (b)
Explanation
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79. The heavier the current in a Zener diode in reverse bias, ________ dynamic resistance value.

(a) the more the
(b) the less the
(c) there is substantially more
(d) there is no change in the

Answer
Answer : (b)
Explanation
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80. The temperature coefficient can be ________ for different Zener levels.

(a) positive
(b) negative
(c) zero
(d) All of the above

Answer
Answer : (d)
Explanation
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