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Special Diodes – 1 – 4

16. The devices commonly used for making digital circuits are :

(a) Mechanical switches
(b) Relays
(c) Vacuum tubes
(d) Semiconductor devices

Answer
Answer : (d)

Explanation
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17. Which one of the following possesses negative resistance characteristics ?

(a) Schottky diode
(b) Tunnel diode
(c) PN junction diode
(d) Hot-carrier diode

Answer
Answer : (b)

Explanation
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18. The region between the peak and valley points of the tunnel diode is called as :

(a) Pinch-off region
(b) Saturation region
(c) Cut-off region
(d) Negative conduction region

Answer
Answer : (d)

Explanation
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19. Avalanche breakdown occurs when :

(a) The forward current is excessive
(b) The forward bias exceeds a certain value
(c) The reverse bias exceeds a certain value
(d) The potential barrier is reduced to zero

Answer
Answer : (c)

Explanation
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20. Zener diode exhibits :

(a) Avalanche breakdown
(b) Zener breakdown
(c) Both (a) & (b)
(d) Neither (a) nor (b)

Answer
Answer : (c)

Explanation
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