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PN Junction Diode – 1 – 4

16. Match list I and list II and select the correct one using the codes given below :
            List I                                                               List II
            P. Resistance                                            1. Current noise
            Q. Diode                                                    2. Partition noise
            R. Triode                                                   3. Shot noise
           S. PN junction                                           4. Johnson noise

(a) P- (4), Q – (1), R- (2), S- (3)
(b) P- (2), Q – (3), R- (1), S- (4)
(c) P- (1), Q – (2), R- (3), S- (4)
(d) P- (4), Q – (3), R- (2), S- (1)

ANSWER

EXPLANATION

17. Capacitive effects are exhibited by PN junctions when they are :

(a) Forward biased
(b) Reverse biased
(c) Either forward or reverse biased
(d) 
Neither forward nor reverse biased

ANSWER

EXPLANATION

18. What is the type of capacitance effect exhibited by the PN junction, when it is reverse biased ?

(a) Transition capacitance
(b) Diffusion capacitance
(c) Space charge capacitance
(d)
 Drift capacitance

ANSWER

EXPLANATION

19. In a PN junction, the density of carriers is …….. near the junction and decays ………. with distance.

(a) Low, linearly
(b) High, linearly
(c) Low, exponentially
(d) 
High, exponentially

ANSWER

EXPLANATION

20. If CT= space change capacitance and CD= storage capacitance of PN junction diode, then :

(a) CT= CD
(b) CT> CD
(c) CT< CD
(d)
 CT= CD =∞

ANSWER

EXPLANATION

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