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MCQs

Total Questions : 44 | Page 3 of 5 pages
Question 21. A crystal diode utilises ___________ characteristic for rectification
  1.    reverse
  2.    forward
  3.    forward or reverse
  4.    none of the above
 Discuss Question
Answer: Option B. -> forward
Question 22. The ripple factor of a half-wave rectifier is ___________
  1.    2
  2.    1.21
  3.    2.5
  4.    0.48
 Discuss Question
Answer: Option B. -> 1.21
Question 23. The maximum efficiency of a half-wave rectifier is ___________
  1.    40.6%
  2.    81.2%
  3.    50%
  4.    25%
 Discuss Question
Answer: Option A. -> 40.6%
Question 24. A zener diode has ___________
  1.    one pn junction
  2.    two pn junctions
  3.    three pn junctions
  4.    none of the above
 Discuss Question
Answer: Option A. -> one pn junction
Question 25. The most widely used rectifier is ___________
  1.    half-wave rectifier
  2.    centre-tap full-wave rectifier
  3.    bridge full-wave rectifier
  4.    none of the above
 Discuss Question
Answer: Option C. -> bridge full-wave rectifier
Question 26. If the doping level in a crystal diode is increased, the width of depletion layer___________
  1.    remains the same
  2.    is decreased
  3.    in increased
  4.    none of the above
 Discuss Question
Answer: Option C. -> in increased
Question 27. The forward voltage drop across a silicon diode is about ___________
  1.    2.5 V
  2.    3 V
  3.    10 V
  4.    0.7 V
 Discuss Question
Answer: Option D. -> 0.7 V
Question 28. A series resistance is connected in the zener circuit to___________
  1.    properly reverse bias the zener
  2.    protect the zener
  3.    properly forward bias the zener
  4.    none of the above
 Discuss Question
Answer: Option B. -> protect the zener
Question 29. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________
  1.    1 : 1
  2.    100 : 1
  3.    1000 : 1
  4.    40000 : 1
 Discuss Question
Answer: Option D. -> 40000 : 1
Question 30. The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode
  1.    the same as
  2.    lower than
  3.    more than
  4.    none of the above
 Discuss Question
Answer: Option B. -> lower than

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