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# Regulated Power Supplies – 1 – 7

31. Two similar 15 V zeners are connected in series. What is the regulated output voltage ?

(a) 15 V
(b) 7.5 V
(c) 30 V
(d) 45 V

Explanation
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32. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply ?

(a) 10 Ω
(b) 20 Ω
(c) 15 Ω
(d) 40 Ω

Explanation
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33. In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each zener has a maximum current rating of 300 mA, what should be the value of series resistance ?

(a) 10 Ω
(b) 50 Ω
(c) 25 Ω
(d) 40 Ω

Explanation
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34. A zener regulator …………… in the power supply.

(a) increases the ripple
(b) decreases the ripple
(c) neither increases nor decreases ripple
(d) data insufficient

Explanation
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35. When load current is zero, the zener current will be …………

(a) zero
(b) minimum
(c) maximum
(d) none of the above