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Regulated DC Power Supply MCQs
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Regulated DC Power Supply MCQs
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25 Questions

1. As the junction temperature increases, the voltage breakdown point for Zener mechanism ............
2. A Zener diode utilises ............ characteristic for voltage regulation
3. In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance?
4. Zener diode can be used as ............
5. Another name for Zener diode is ............ diode
6. A power supply which has voltage regulation of ........... is unregulated power supply
7. A 30 V Zener will have depletion layer width ............. that of 10 V Zener
8. A Zener diode ..............
9. In a 15 V Zener diode , the breakdown mechanism will occur by .............
10. Commercial power supplies have voltage regulation .............
11. 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?
12. For increasing the voltage rating, zeners are connected in ..............
13. A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes ...............
14. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance?
15. In an unregulated power supply, if load current increases, the output voltage ...........
16. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
17. The current in a Zener diode is limited by ..............
18. A power supply has a voltage regulation of 1%. If the no-load  voltage is 20 V, what is the full-load voltage?
19. A Zener diode is used as a ............... voltage regulating device
20. 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?
21. A Zener regulator ............... in the power supply
22. Zener diode are generally made of ..........
23. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
24. In a loaded Zener regulator, which is the largest Zener current?
25. In an unregulated power supply, if input a.c. voltage increases, the output voltage .......

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