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regulated d c power supply MCQs

Practise focused regulated d c power supply questions with marked answers for exam preparation and subject revision.

regulated d c power supply Mcqs

1. If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
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A. Decreases

B. Stays the same

C. Increases

D. None of the above

2. A Zener diode is used as a _____________voltage regulating device?
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A. Series-shunt

B. None of the above

C. Series

D. Shunt

3. Commercial power supplies have voltage regulation ______________?
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A. within 1%

B. of 15%

C. of 10%

D. of 25%

4. If the doping level is increased, the breakdown voltage of the Zener_______________?
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A. None of the above

B. Remains the same

C. Is decreased

D. Is increased

5. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
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A. 1 O

B. 1 O

C. 100 O

D. 10 O

6. Which of these is the best description for a Zener diode ?
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A. It works in the forward region

B. It is a constant-voltage device

C. It is a constant current device

D. It is a diode

7. As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?
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A. Remains the same

B. Is increased

C. None of the above

D. Is decreased

8. What is true about the breakdown voltage in a Zener diode ?
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A. It equals current times the resistance

B. It is approximately constant

C. It decreases when load current increases

D. It destroys the diode

9. For increasing the voltage rating, zeners are connected in_____________?
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A. Series-parallel

B. Parallel

C. Series

D. None of the above

10. The rupture of co-valent bonds will occur when the electric field is__________________?
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A. 1000 V/cm

B. 6 V/cm

C. More than 105 V/cm

D. 100 V/cm

11. When load current is zero, the Zener current will be_____________?
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A. Zero

B. Minimum

C. None of the above

D. Maximum

12. 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?
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A. 10 O

B. 40 O

C. 15 O

D. 20 O

13. A Zener regulator _____________ in the power supply?
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A. Increases the ripple

B. Decreases the ripple

C. Data insufficient

D. Neither increases nor decreases the ripple

14. In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?
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A. Increases

B. Remains the same

C. None of the above

D. Decreases

15. A power supply which has voltage regulation of ____________ is unregulated power supply?
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A. 10 %

B. 5%

C. 0%

D. 8%

16. Zener diode can be used as__________________?
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A. c. voltage regulator only

B. c. voltage regulator only

C. both D.C and A.C voltage regulator

D. none of the above

17. A Zener voltage regulator is used for ____________ load currents?
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A. Small

B. High

C. Very high

D. Moderate

18. 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 ?
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A. 25 O

B. 10 O

C. 40 O

D. 50 O

19. 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 ?
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A. 09%

B. None of the above

C. 87%

D. 72%

20. Zener diode are generally made of _____________?
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A. Germanium

B. None of the above

C. Carbon

D. Silicon

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