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Semiconductor Materials – 3 – 8

136. The battery connections required to forward bias a pn junction are ……..

(a) +ve terminal to p and -ve terminal to n
(b) -ve terminal to p and +ve terminal to n
(c) -ve terminal to p and -ve terminal to n
(d) none of the above

ANSWER

EXPLANATION

137. The barrier voltage at a pn junction for germanium is about ……..

(a) 3.5 V
(b) 3 V
(c) zero
(d) 0.3 V

ANSWER

EXPLANATION

138. In the depletion region of a pn junction, there is a shortage of ……….

(a) acceptor ions
(b) holes and electrons
(c) donor ions
(d) none of the above

ANSWER

EXPLANATION

139. A reverse biased pn junction has ……..

(a) very narrow depletion layer
(b) almost no current
(c) very low resistance
(d) large current flow

ANSWER

EXPLANATION

140. A pn junction acts as a ……..

(a) controlled switch
(b) bidirectional switch
(c) unidirectional switch
(d) none of the above

ANSWER

EXPLANATION

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