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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

(a) 40.6%
(b) 81.2%
(c) 50%
(d)
 25%

ANSWER

EXPLANATION

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