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EE AND ECE - Regulated DC Power Supply MCQs
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EE AND ECE - Regulated DC Power Supply MCQs
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25 Questions

1. The rupture of co-valent bonds will occur when the electric field is ………….
2. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?
3. The current in a Zener diode is limited by …………..
4. A Zener diode is used as a …………… voltage regulating device
5. Which of these is the best description for a Zener diode?
6. In an unregulated power supply, if input a.c. voltage increases, the output voltage …….
7. In a loaded Zener regulator, which is the largest Zener current?
8. A 30 V Zener will have depletion layer width …………. that of 10 V Zener
9. 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?
10. The load voltage is approximately constant when a Zener diode is ……….
11. A power supply can deliver a maximum rated current of0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
12. If the load resistance decreases in a Zener regulator, then Zener current …………….
13. What is true about the breakdown voltage in a Zener diode?
14. Zener diode can be used as …………
15. In an unregulated power supply, if load current increases, the output voltage ………..
16. A Zener regulator …………… in the power supply
17. The Zener current will be minimum when …………
18. If the load current drawn by unregulated power supply increases, the d.c. output voltage ………
19. If the load current drawn by unregulated power supply increases, the d.c. output voltage ………..
20. A Zener voltage regulator is used for …………… load currents
21. 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?
22. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
23. Another name for Zener diode is ………… diode
24. A Zener diode utilises ………… characteristic for voltage regulation
25. A Zener diode …………..

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