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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION

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