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Special Diodes – 1 – 6

26. The barrier potential of Schottky diode is :

(a) 0.25 V
(b) 0.35 V
(c) 0.45 V
(d) 0.56 V

ANSWER

EXPLANATION

27. Across a varactor diode, an increase in its reverse bias potential causes :

(a) Width of depletion layer to increase thus increasing the capacitance
(b) Width of depletion layer to decrease thus increasing the capacitance
(c) Width of depletion layer to increase thus decreasing the capacitance
(d) Width of depletion layer to decrease thus decreasing the capacitance

ANSWER

EXPLANATION

28. Which among the following diodes has zero breakdown voltage ?

(a) Zener diode
(b) Schottky diode
(c) Backward diode
(d) Tunnel diode

ANSWER

EXPLANATION

29. A Zener diode may be thought as open for :

(a) 0V < V < VZ
(b) 0V > V > VZ
(c) 0V > V < VZ
(d) 0V < V > VZ

ANSWER

EXPLANATION

30. A Schottky diode has :

(a) Insulator – Semiconductor junction
(b) Semiconductor – Semiconductor junction
(c) Metal – Semiconductor junction
(d) Metal – Metal junction

ANSWER

EXPLANATION

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