Regulated D.C. Power Supply Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Regulated D.C. Power Supply ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Regulated D.C. Power Supply comprehensively.

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8 V

7 V

6 V

2 V

10 O

50 O

25 O

40 O

3. When load current is zero, the Zener current will be_____________?

Zero

Minimum

Maximum

None of the above

10 O

20 O

15 O

40 O

5. A Zener regulator _____________ in the power supply?

Increases the ripple

Decreases the ripple

Neither increases nor decreases the ripple

Data insufficient

6. The Zener current will be minimum when_____________?

None of the above

15 V

5 V

30 V

45 V

10%

20%

15%

5%

9. The load voltage is approximately constant when a Zener diode is ________________?

Forward biased

Unbiased

Reverse biased

Operating in the breakdown region

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

Increases

Decreases

Stays the same

None of the above

11. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?

Increases

Decreases

Stays the same

None of the above

12. In a loaded Zener regulator, which is the largest Zener current ?

Series current

Zener current

None of the above

13. Which of these is the best description for a Zener diode ?

It is a diode

It is a constant current device

It is a constant-voltage device

It works in the forward region

14. If the load resistance decreases in a Zener regulator, then Zener current ______________?

Decreases

Stays the same

Increases

None of the above

15. A Zener diode______________?

Is a battery

Acts like a battery in the breakdown region

Has a barrier potential of 1 V

Is forward biased

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