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Regulated D.C. Power Supply

Free 40+ Regulated D.C. Power Supply MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Regulated D.C. Power Supply — MCQs for Pakistan government job tests

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Regulated D.C. Power Supply

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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?

9.Under which condition does a Zener diode maintain a nearly constant load voltage?

10.What happens to the DC output voltage of an unregulated power supply when the load current rises?

11.What happens to the DC output voltage of an unregulated power supply when the load current rises?

12.In a loaded Zener diode voltage regulator, which current is the greatest?

13.How would you best define the function of a Zener diode?

14.What happens to the Zener current when the load resistance is reduced in a Zener voltage regulator?

15.What is the behavior of a Zener diode when it operates in its breakdown region?

16.How does the depletion region width of a 30 V Zener diode compare to that of a 10 V Zener diode?

17.Which statement accurately describes the breakdown voltage characteristic of a Zener diode?

18.If a variation of 5 mA in the Zener current results in a 50 mV change in the Zener voltage, what is the Zener impedance?

19.What component restricts the current flowing through a Zener diode?

20.A voltage regulator provides 6 V when there is no load and 5.82 V at full load. What is the load regulation percentage?

How to prepare with Regulated D.C. Power Supply MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Regulated D.C. Power Supply appears in real exam conditions.

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