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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
To find the minimum load resistance, use Ohm's law: R = V / I. Given voltage (V) is 20 V and maximum current (I) is 0.5 A, so R = 20 / 0.5 = 40 ohms. Therefore, the smallest load resistance that can be connected without exceeding the current rating is 40 ohms.
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.What effect does a Zener regulator have on the ripple voltage in a power supply?
- 5.When does the Zener diode current reach its lowest value?
- 6.If two identical 15 V Zener diodes are connected in series, what will be the total regulated output voltage?
- 7.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?
- 8.Under which condition does a Zener diode maintain a nearly constant load voltage?
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