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- Subject
- Regulated D.C. Power Supplyelectrical-engineering-mcqs › regulated-d-c-power-supply
- Published
- 22 Dec 2018
- Last updated
- 28 May 2026
Explanation
A Zener diode stabilizes the voltage across a load when it operates in its breakdown region. In this state, the diode maintains a nearly constant voltage despite changes in current, which is why it is used for voltage regulation. Forward biasing or simply reverse biasing without reaching breakdown does not provide this voltage stabilization.
More Regulated D.C. Power Supply MCQs
Practice related questions from the same subject.
- 1.A power supply exhibits a voltage regulation of 1%. Given that the voltage at no load is 20 V, what is the voltage when the supply is fully loaded?
- 2.In a regulated power supply setup, two identical 15 V Zener diodes are connected in series, and the input DC voltage is 45 V. If each Zener diode has a maximum current rating of 300 mA, what value of series resistor should be used?
- 3.What happens to the Zener current when there is no load current flowing?
- 4.A power source provides a maximum current of 0.5 A at its full-load voltage of 20 V. What is the smallest load resistance that can be safely connected to this power supply?
- 5.What effect does a Zener regulator have on the ripple voltage in a power supply?
- 6.When does the Zener diode current reach its lowest value?
- 7.If two identical 15 V Zener diodes are connected in series, what will be the total regulated output voltage?
- 8.If the alternating current (a.c.) input voltage to a regulated or standard power supply rises by 5%, what is the approximate percentage change in the direct current (d.c.) output voltage?
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