# 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

EXPLANATION
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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 %

EXPLANATION
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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

EXPLANATION
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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

EXPLANATION
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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

EXPLANATION
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