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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

EXPLANATION

22. Barrier potential of PN junction decreases as temperature :

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

ANSWER

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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