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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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