1. In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?
A. Increases
B. Decreases
C. Remains the same
D. None of the above
✅ The correct answer is option A.
Regulated D.C. Power Supply MCQs
2. Zener diode can be used as__________________?
A. c. voltage regulator only
B. c. voltage regulator only
C. both D.C and A.C voltage regulator
D. none of the above
✅ The correct answer is option C.
3. Commercial power supplies have voltage regulation ______________?
A. of 10%
B. of 15%
C. of 25%
D. within 1%
✅ The correct answer is option D.
4. A power supply which has voltage regulation of ____________ is unregulated power supply?
A. 0 %
B. 5 %
C. 10 %
D. 8%
✅ The correct answer is option C.
5. Which of these is the best description for a Zener diode ?
A. It is a diode
B. It is a constant current device
C. It is a constant-voltage device
D. It works in the forward region
✅ The correct answer is option C.
6. As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?
A. Is increased
B. Is decreased
C. Remains the same
D. None of the above
✅ The correct answer is option B.
7. An ideal regulated power supply is one which has voltage regulation of________________?
A. 0%
B. 5%
C. 10%
D. 1%
✅ The correct answer is option A.
8. In a loaded Zener regulator, which is the largest Zener current ?
A. Series current
B. Zener current
C. Load current
D. None of the above
✅ The correct answer is option A.
9. In an unregulated power supply, if load current increases, the output voltage _____________?
A. Remains the same
B. Decreases
C. Increases
D. None of the above
✅ The correct answer is option B.
10. What is true about the breakdown voltage in a Zener diode ?
A. It decreases when load current increases
B. It destroys the diode
C. It equals current times the resistance
D. It is approximately constant
✅ The correct answer is option D.