11. The rupture of co-valent bonds will occur when the electric field is__________________?
A. 100 V/cm
B. 6 V/cm
C. 1000 V/cm
D. More than 105 V/cm
✅ The correct answer is option D.
Regulated D.C. Power Supply MCQs
12. A Zener diode utilises_____________characteristic for voltage regulation?
A. Forward
B. Reverse
C. Both forward and reverse
D. None of the above
✅ The correct answer is option B.
13. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
A. More than
B. Less than
C. Equal to
D. None of the above
✅ The correct answer is option A.
14. A Zener diode______________?
A. Is a battery
B. Acts like a battery in the breakdown region
C. Has a barrier potential of 1 V
D. Is forward biased
✅ The correct answer is option B.
15. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
A. Increases
B. Decreases
C. Stays the same
D. None of the above
✅ The correct answer is option B.
16. 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 ?
A. 09%
B. 87 %
C. 72 %
D. None of the above
✅ The correct answer is option A.
17. A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?
A. 1 O
B. 1 O
C. 100 O
D. 10 O
✅ The correct answer is option D.
18. If the load resistance decreases in a Zener regulator, then Zener current ______________?
A. Decreases
B. Stays the same
C. Increases
D. None of the above
✅ The correct answer is option A.
19. The current in a Zener diode is limited by _______________?
A. External resistance
B. Power dissipation
C. Both (A) and (B)
D. None of the above
✅ The correct answer is option .
20. In a 15 V Zener diode , the breakdown mechanism will occur by ______________?
A. Avalanche mechanism
B. Zener mechanism
C. Both Zener and avalanche mechanism
D. None of the above
✅ The correct answer is option A.