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MCQs

Total Questions : 37 | Page 3 of 4 pages
Question 21. A Zener diode ___________
  1.    Is a battery
  2.    Acts like a battery in the breakdown region
  3.    Has a barrier potential of 1 V
  4.    Is forward biased
 Discuss Question
Answer: Option B. -> Acts like a battery in the breakdown region
Question 22. The rupture of covalent bonds will occur when the electric field is ___________
  1.    100 V/cm
  2.    0.6 V/cm
  3.    1000 V/cm
  4.    More than 10⁵ V/cm
 Discuss Question
Answer: Option D. -> More than 10⁵ V/cm
Question 23. What is true about the breakdown voltage in a Zener diode?
  1.    It decreases when load current increases
  2.    It destroys the diode
  3.    It equals current times the resistance
  4.    It is approximately constant
 Discuss Question
Answer: Option D. -> It is approximately constant
Question 24. A Zener diode is used as a ___________ voltage regulating device
  1.    Shunt
  2.    Series
  3.    Series-shunt
  4.    None of the above
 Discuss Question
Answer: Option A. -> Shunt
Question 25. A power supply which has voltage regulation of ___________ is unregulated power supply
  1.    0%
  2.    5%
  3.    10%
  4.    8%
 Discuss Question
Answer: Option C. -> 10%
Question 26. Commercial power supplies have voltage regulation ___________
  1.    of 10%
  2.    of 15%
  3.    of 25%
  4.    within 1%
 Discuss Question
Answer: Option D. -> within 1%
Question 27. If the doping level is increased, the breakdown voltage of the Zener ___________
  1.    Remains the same
  2.    Is increased
  3.    Is decreased
  4.    None of the above
 Discuss Question
Answer: Option C. -> Is decreased
Question 28. The current in a Zener diode is limited by ___________
  1.    External resistance
  2.    Power dissipation
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 29. Another name for Zener diode is ___________ diode
  1.    Breakdown
  2.    Voltage
  3.    Power
  4.    Current
 Discuss Question
Answer: Option A. -> Breakdown
Question 30. The Zener current will be minimum when ___________
  1.    Load current is maximum
  2.    Load current is minimum
  3.    Load current is zero
  4.    None of the above
 Discuss Question
Answer: Option A. -> Load current is maximum

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