Regulated Dc Power Supply - Study Mode

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[#1] Two similar 15 V Zeners are connected in series. What is the regulated output voltage?

(A) 15 V

(B) 5 V

(C) 30 V

(D) 45 V

Correct Answer

(C) 30 V

[#2] An ideal regulated power supply is one which has voltage regulation of ___________

(A) 0%

(B) 5%

(C) 10%

(D) 1%

Correct Answer

(A) 0%

[#3] If the input a.c. voltage to regulated 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%

Correct Answer

(D) 5%

[#4] The load voltage is approximately constant when a Zener diode is ___________

(A) Forward biased

(B) Unbiased

(C) Reverse biased

(D) Operating in the breakdown region

Correct Answer

(D) Operating in the breakdown region

[#5] A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?

(A) 8 V

(B) 7 V

(C) 6 V

(D) 2 V

Correct Answer

(A) 8 V