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MCQs

Total Questions : 202 | Page 3 of 21 pages
Question 21. When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Increases
Question 22. Power electronics essentially deals with control of a.c. power at ___________.
  1.    Frequencies above 20 kHz
  2.    Frequencies above 1000 kHz
  3.    Frequencies less than 10 Hz
  4.    50 Hz frequency
 Discuss Question
Answer: Option D. -> 50 Hz frequency
Question 23. A diac is ___________ switch
  1.    An c.
  2.    A d.c.
  3.    A mechanical
  4.    None of the above
 Discuss Question
Answer: Option A. -> An c.
Question 24. A triac has ___________ semiconductor layers.
  1.    Two
  2.    Three
  3.    Four
  4.    Five
 Discuss Question
Answer: Option C. -> Four
Question 25. A diac is simply ___________.
  1.    A single junction device
  2.    A three junction device
  3.    A triac without gate terminal
  4.    None of the above
 Discuss Question
Answer: Option C. -> A triac without gate terminal
Question 26. A diac has ___________ semiconductor layers
  1.    Three
  2.    Two
  3.    Four
  4.    None of the above
 Discuss Question
Answer: Option A. -> Three
Question 27. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________
  1.    Remains the same
  2.    Is decreased
  3.    Is increased
  4.    None of the above
 Discuss Question
Answer: Option B. -> Is decreased
Question 28. A triac is equivalent to two SCRs ___________.
  1.    In parallel
  2.    In series
  3.    In inverse-parallel
  4.    None of the above
 Discuss Question
Answer: Option C. -> In inverse-parallel
Question 29. The triac is ___________.
  1.    Like a bidirectional SCR
  2.    A four-terminal device
  3.    Not a thyristor
  4.    None of the above
 Discuss Question
Answer: Option A. -> Like a bidirectional SCR
Question 30. The normal way to turn on a diac is by ___________.
  1.    Gate voltage
  2.    Gate current
  3.    None of these
  4.    Breakover voltage
 Discuss Question
Answer: Option D. -> Breakover voltage

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