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MCQs

Total Questions : 37 | Page 4 of 4 pages
Question 31. Which of these is the best description for a Zener diode?
  1.    It is a diode
  2.    It is a constant current device
  3.    It is a constant-voltage device
  4.    It works in the forward region
 Discuss Question
Answer: Option C. -> It is a constant-voltage device
Question 32. In a 15 V Zener diode , the breakdown mechanism will occur by ___________
  1.    Avalanche mechanism
  2.    Zener mechanism
  3.    Both Zener and avalanche mechanism
  4.    None of the above
 Discuss Question
Answer: Option A. -> Avalanche mechanism
Question 33. A Zener diode utilises ___________ characteristic for voltage regulation
  1.    Forward
  2.    Reverse
  3.    Both forward and reverse
  4.    None of the above
 Discuss Question
Answer: Option B. -> Reverse
Question 34. A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?
  1.    10 Ω
  2.    20 Ω
  3.    15 Ω
  4.    40 Ω
 Discuss Question
Answer: Option D. -> 40 Ω
Question 35. In a loaded Zener regulator, which is the largest Zener current?
  1.    Series current
  2.    Zener current
  3.    Load current
  4.    None of the above
 Discuss Question
Answer: Option A. -> Series current
Question 36. 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?
  1.    3.09
  2.    2.87
  3.    5.72
  4.    None of the above
 Discuss Question
Answer: Option A. -> 3.09
Question 37. In an unregulated power supply, if input a.c. voltage increases, the output voltage .
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Increases

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