regulated d c power supply MCQs – Page 2

Practise focused regulated d c power supply questions with marked answers for exam preparation and subject revision.

regulated d c power supply Mcqs

21. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
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A. Decreases

B. None of the above

C. Stays the same

D. Increases

22. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?
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A. 2 V

B. 6 V

C. 7 V

D. 8 V

23. An ideal regulated power supply is one which has voltage regulation of________________?
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A. 5%

B. 0%

C. 10%

D. 1%

24. As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decrease

25. The current in a Zener diode is limited by _______________?
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A. External resistance

B. Power dissipation

C. Both (A) and (B)

D. None of the above

26. If the load resistance decreases in a Zener regulator, then Zener current ______________?
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A. Stays the same

B. None of the above

C. Increases

D. Decreases

27. The Zener current will be minimum when_____________?
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A. Load current is minimum

B. Load current is maximum

C. Load current is zero

D. None of the above

28. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
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A. Equal to

B. More than

C. None of the above

D. Less than

29. In a Zener voltage regulator, the changes in load current produce changes in _________________?
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A. Zener voltage as well as Zener current

B. Zener voltage

C. None of the above

D. Zener current

30. A Zener diode utilises_____________characteristic for voltage regulation?
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A. Forward

B. Reverse

C. Both forward and reverse

D. None of the above

31. In an unregulated power supply, if load current increases, the output voltage _____________?
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A. Increases

B. None of the above

C. Decreases

D. Remains the same

32. In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
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A. Avalanche mechanism

B. Zener mechanism

C. Both Zener and avalanche mechanism

D. None of the above

33. 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?
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A. 5%

B. 20%

C. 10%

D. 15%

34. The load voltage is approximately constant when a Zener diode is ________________?
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A. Unbiased

B. Operating in the breakdown region

C. Reverse biased

D. Forward biased

35. A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes______________?
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A. None of the above

B. More than load current

C. Zero

D. Less than load current

36. Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
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A. 30 V

B. 45 V

C. 15 V

D. 5 V

37. A Zener diode______________?
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A. Is a battery

B. Acts like a battery in the breakdown region

C. Is forward biased

D. Has a barrier potential of 1 V

38. A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?
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A. Avalanche

B. Zener

C. Both avalanche and Zener

D. None of the above

39. Another name for Zener diode is ______________diode?
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A. Voltage

B. Power

C. Breakdown

D. Current

40. In a loaded Zener regulator, which is the largest Zener current ?
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A. None of the above

B. Series current

C. Load current

D. Zener current

Showing 21 to 40 of 40 mcqs