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MCQs

Total Questions : 37 | Page 2 of 4 pages
Question 11. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?
  1.    15 V
  2.    5 V
  3.    30 V
  4.    45 V
 Discuss Question
Answer: Option C. -> 30 V
Question 12. 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?
  1.    10%
  2.    20%
  3.    15%
  4.    5%
 Discuss Question
Answer: Option D. -> 5%
Question 13. The load voltage is approximately constant when a Zener diode is ___________
  1.    Forward biased
  2.    Unbiased
  3.    Reverse biased
  4.    Operating in the breakdown region
 Discuss Question
Answer: Option D. -> Operating in the breakdown region
Question 14. An ideal regulated power supply is one which has voltage regulation of ___________
  1.    0%
  2.    5%
  3.    10%
  4.    1%
 Discuss Question
Answer: Option A. -> 0%
Question 15. A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage?
  1.    8 V
  2.    7 V
  3.    6 V
  4.    2 V
 Discuss Question
Answer: Option A. -> 8 V
Question 16. 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?
  1.    10 Ω
  2.    50 Ω
  3.    25 Ω
  4.    40 Ω
 Discuss Question
Answer: Option B. -> 50 Ω
Question 17. As the junction temperature increases, the voltage breakdown point for Zener mechanism ___________
  1.    Is increased
  2.    Is decreased
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Is decreased
Question 18. For increasing the voltage rating, zeners are connected in ___________
  1.    Parallel
  2.    Series-parallel
  3.    Series
  4.    None of the above
 Discuss Question
Answer: Option C. -> Series
Question 19. As the junction temperature increases, the voltage breakdown point for avalanche mechanism ___________
  1.    Remains the same
  2.    Decrease
  3.    Increases
  4.    None of the above
 Discuss Question
Answer: Option C. -> Increases
Question 20. When load current is zero, the Zener current will be
  1.    Zero
  2.    Minimum
  3.    Maximum
  4.    None of the above
 Discuss Question
Answer: Option C. -> Maximum

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