PN Junction Diode – 1 – 5

21. Which one is the valid statement with respect to PN junction diode ?

(a) Under forward bias, the electrons from P region & holes from N region drift towards the junction
(b) A junction diode cannot be used as a switch in electrical circuits
(c) Depletion capacitance is voltage independent
(d) Diffusion current of minority carriers is proportional to the concentration gradient

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

22. Barrier potential of PN junction decreases as temperature :

(a) Increases
(b) Decreases
(c) Remains constant
(d) Increases & then decreases

ANSWER
Answer : (a)

EXPLANATION
No answer description available for this question. Let us discuss.

23. What is the type of capacitance effect exhibited by the PN junction when it is forward biased ?

(a) Diffusion capacitance
(b) Storage capacitance
(c) Drift capacitance
(d) Transition capacitance

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

24. The variable capacitance property possessed by the reverse biased PN junction is used to construct a device known as :

(a) Zener diode
(b) Volta caps
(c) Gunn diode
(d) Tunnel diode

ANSWER
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

25. The frequency biased PN junction diode :

(a) Acts like an open circuit
(b) Offers infinite resistance
(c) Provides very high voltage drop
(d) Conducts current easily

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

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