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Regulated Power Supplies – 1 – 6

26. If the load resistance decreases in a zener regulator, then zener current ………….

(a) decreases
(b) stays the same
(c) increases
(d) none of the above

Answer
Answer : (a)

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

27. If the input a.c. voltage to unregulated or ordinary power supply increases by 5 %, what will be the approximate change in d.c. output voltage ?

(a) 10 %
(b) 20 %
(c) 15 %
(d) 5 %

Answer
Answer : (d)

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

28. If the load current drawn by unregulated power supply increases, the d.c. output voltage …………

(a) increases
(b) decreases
(c) stays the same
(d) none of the above

Answer
Answer : (b)

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

29. If a power supply has no-load and full-load voltages of 30 V and 25 V respectively, then percentage voltage regulation is …………

(a) 10 %
(b) 20 %
(c) 15 %
(d) none of the above

Answer
Answer : (b)

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

30. A power supply has a voltage regulation of 1 %. If the no-load voltage is 20 V, what is the full-load voltage ?

(a) 20.8 V
(b) 15.7 V
(c) 18.6 V
(d) 17.2 V

Answer
Answer : (a)

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

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