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Regulated Power Supplies – 1 – 5

21. What is true about the breakdown voltage in a zener diode ?

(a) It decreases when load current increases.
(b) It destroys the diode.
(c) It equals current times the resistance.
(d) It is approximately constant.

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

22. Which of these is the best description for a zener diode ?

(a) It is a diode.
(b) It is a constant-current device
(c) It is a constant-voltage device.
(d) It works in the forward region

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

23. A zener diode …………

(a) is a battery
(b) acts like a battery in the breakdown region
(c) has a barrier potential of 1 V
(d) is forward biased

Answer
Answer : (b)

Explanation
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24. The load voltage is approximately constant when a zener diode is …………

(a) forward biased
(b) unbiased
(c) reverse biased
(d) operating in the breakdown region

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

25. In a loaded zener regulator, which is the largest zener current ?

(a) series current
(b) zener current
(c) load current
(d) none of the above

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

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