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MCQs

Total Questions : 202 | Page 6 of 21 pages
Question 51. A diac has ___________ semiconductor layers
  1.    Four
  2.    None of these
  3.    Three
  4.    Two
 Discuss Question
Answer: Option C. -> Three
Question 52. A UJT has ___________.
  1.    None of these
  2.    Two pn junctions
  3.    Three pn junctions
  4.    One pn junction
 Discuss Question
Answer: Option D. -> One pn junction
Question 53. A triac is equivalent to two SCRs ___________.
  1.    In series
  2.    In parallel
  3.    In inverse-parallel
  4.    None of these
 Discuss Question
Answer: Option C. -> In inverse-parallel
Question 54. The triac is ___________.
  1.    Not a thyristor
  2.    None of these
  3.    A four-terminal device
  4.    Like a bidirectional SCR
 Discuss Question
Answer: Option D. -> Like a bidirectional SCR
Question 55. A triac is a ___________ switch
  1.    Bidirectional
  2.    Mechanical
  3.    Unidirectional
  4.    None of these
 Discuss Question
Answer: Option A. -> Bidirectional
Question 56. The UJT may be used as ___________.
  1.    None of these
  2.    A sawtooth generator
  3.    A rectifier
  4.    Am amplifier
 Discuss Question
Answer: Option B. -> A sawtooth generator
Question 57. A diac has ___________ pn junctions
  1.    Two
  2.    Three
  3.    Four
  4.    None of these
 Discuss Question
Answer: Option A. -> Two
Question 58. A diac has ___________ terminals.
  1.    Three
  2.    None of these
  3.    Four
  4.    Two
 Discuss Question
Answer: Option D. -> Two
Question 59. The typical value of SCR for modern alternator is
  1.     1.0.
  2.     1.2.
  3.     1.5.
  4.     0.5.
 Discuss Question
Answer: Option D. ->  0.5.
Question 60. A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is
  1.      0.32.
  2.      0.45.
  3.      0.67.
  4.      0.27.
 Discuss Question
Answer: Option C. ->   0.67.

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