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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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