Special Diodes – 1 – 1

1. A Zener diode :

(a) Is a battery under forward biased condition
(b) Acts like battery when it breakdowns
(c) Is a switch
(d) Is a device having barrier potential more than 5V

ANSWER

EXPLANATION

2. At 25ºC, a Zener diode rates at 2 watts, its power rating at 50ºC will be :

(a) Zero watts
(b) Less than 1 watt
(c) Greater than 2 watts
(d) Less than 2 watts

ANSWER

EXPLANATION

3. Silicon is appreciably employed as a base material compared to germanium while manufacturing Zener diode since :

(a) silicon is abundantly available
(b) it is costlier
(c) it has low current capability
(d) it has high temperature capability

ANSWER

EXPLANATION

4. The capacitance of a varactor diode increases, when the reverse voltage across it is :

(a) Decreased
(b) Increased
(c) Kept constant
(d) None of the above

ANSWER

EXPLANATION

5. The main advantage of a point contact diode is that :

(a) The ratio of forward current to reverse current is very high
(b) Low input impedance
(c) Its cut-in voltage is equal to zero
(d)
 Its reverse resistance is infinite

ANSWER

EXPLANATION

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