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Regulated Power Supplies – 1 – 4

16. If the doping level is increased, the breakdown voltage of the zener …………

(a) remains the same
(b) is increased
(c) is decreased
(d) 
none of the above

ANSWER

EXPLANATION

17. A 30 V zener will have depletion layer width ………… that of 10 V zener.

(a) more than
(b) less than
(c) equal to
(d) 
none of the above

ANSWER

EXPLANATION

18. The current in a zener diode is limited by …………

(a) external resistance
(b) power dissipation
(c) both a and b
(d) 
none of the above

ANSWER

EXPLANATION

19. A 5 mA change in zener current produces a 50 mV change in zener voltage. What is the zener impedance ?

(a) 1 Ω
(b) 0.1 Ω
(c) 100 Ω
(d)
 10 Ω

ANSWER

EXPLANATION

20. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?

(a) 3.09 %
(b) 2.87 %
(c) 5.72 %
(d) 
none of the above

ANSWER

EXPLANATION

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