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.
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
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
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
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
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