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Special Diodes – 1 – 5

21. Tunnel diode, with its negative resistance characteristics can be employed for :

(a) Current amplification
(b) Voltage amplification
(c) Power amplification
(d) All of the above

ANSWER

EXPLANATION

22. Match the following
P. SCR                              (I) Low current SCR without gate
Q. Triac                           (II) Low current SCR with gate
R. Schottky diode         (III) Uni-directional
S. SCS                             (IV) Bi-directional

(a) P – IV, Q – III, R – I, S – II
(b) P – I, Q – II, R – III, S – IV
(c) P – III, Q – IV, R – I, S – II
(d) P -I, Q – IV, R – II, S – III

ANSWER

EXPLANATION

23. In a Zener diode :

(a) P & N regions are lightly doped
(b) The depletion region is wide
(c) P & N regions are heavily doped
(d) The junction field current is small

ANSWER

EXPLANATION

24. In tunnel diode, the impurity concentration is in the order of :

(a) 1 part in 10^10 parts
(b) 1 part in 10^6 parts
(c) 1 part in 10^9 parts
(d) 1 part in 10^3 parts

ANSWER

EXPLANATION

25. Which diode is otherwise known as ESAKI diode ?

(a) PIN diode
(b) Schottky barrier diode
(c) GUNN diode
(d) Tunnel diode

ANSWER

EXPLANATION

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