Regulated Dc Power Supply(Electrical Engineering ) Questions and Answers
Question 1. A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes ___________
Less than load current
Zero
More than load current
None of the above
Explanation:-
Answer: Option B. -> Zero
Question 2. Zener diode are generally made of ___________
Germanium
Silicon
Carbon
None of the above
Explanation:-
Answer: Option B. -> Silicon
Question 3. A Zener regulator ___________ in the power supply
Increases the ripple
Decreases the ripple
Neither increases nor decreases the ripple
Data insufficient
Explanation:-
Answer: Option B. -> Decreases the ripple
Question 4. In an unregulated power supply, if load current increases, the output voltage ___________
Remains the same
Decreases
Increases
None of the above
Explanation:-
Answer: Option B. -> Decreases
Question 5. If the load resistance decreases in a Zener regulator, then Zener current ___________
Decreases
Stays the same
Increases
None of the above
Explanation:-
Answer: Option A. -> Decreases
Question 6. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
15 V
5 V
30 V
45 V
Explanation:-
Answer: Option C. -> 30 V
Question 7. The load voltage is approximately constant when a Zener diode is ___________
Forward biased
Unbiased
Reverse biased
Operating in the breakdown region
Explanation:-
Answer: Option D. -> Operating in the breakdown region
Question 8. An ideal regulated power supply is one which has voltage regulation of ___________
0%
5%
10%
1%
Explanation:-
Answer: Option A. -> 0%
Question 9. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?
8 V
7 V
6 V
2 V
Explanation:-
Answer: Option A. -> 8 V
Question 10. If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?
