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# Rectifiers – 1 – 3

11. There is a need of transformer for ……..

(a) half-wave rectifier
(b) centre-tap full-wave rectifier
(c) bridge full-wave rectifier
(d)  none of the above

Explanation
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12. The PIV rating of each diode in a bridge rectifier is …….. that of the equivalent centretap rectifier.

(a) one-half
(b) the same as
(c) twice
(d) four times

Explanation
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13. For the same secondary voltage, the output voltage from a centre-tap rectifier is …….. than that of bridge rectifier.

(a) twice
(b) thrice
(c) four times
(d) one-half

Explanation
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14. A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8 : 1, what is the peak load voltage ? Ignore diode drop.

(a) 27.5 V
(b) 86.5 V
(c) 30 V
(d) 42.5 V

Explanation
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15. The maximum efficiency of a half-wave rectifier is ………..

(a) 40.6%
(b) 81.2%
(c) 50%
(d) 25%