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MCQs

Total Questions : 202 | Page 17 of 21 pages
Question 161. A diac has ___________ semiconductor layers
  1.    Three
  2.    Two
  3.    Four
  4.    None of the above
 Discuss Question
Answer: Option A. -> Three
Question 162. All the modern AC-DC converters are using GTOs instead of SCRs because
  1.    emperature is an issue in SCRs
  2.    Switching losses are high in SCRs
  3.    GTOs have reliable commutation
  4.    GTOs are cheaply available today
 Discuss Question
Answer: Option C. -> GTOs have reliable commutation
Question 163. The values of duty cycle (α) lies between
  1.    1
  2.    0
  3.    0>α>-1
  4.    0
 Discuss Question
Answer: Option D. -> 0
Question 164. When the temperature increases, the intrinsic stand off ratio ___________
  1.    Increases
  2.    Decreases
  3.    Essentially remains the same
  4.    None of the above
 Discuss Question
Answer: Option C. -> Essentially remains the same
Question 165. A single phase half wave controlled converter always operates in the ________ conduction mode
  1.    continuous
  2.    discontinuous
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option B. -> discontinuous
Question 166. The four quadrant operation of dual converters can be obtained by
  1.    moving the mechanical lever
  2.    changing the firing angle value
  3.    adding inductance to the circuit
  4.    none of the mentioned
 Discuss Question
Answer: Option B. -> changing the firing angle value
Question 167. A single full converter alone can given a
  1.    two quadrant operation
  2.    three quadrant operation
  3.    four quadrant operation,
  4.    none of the mentioned
 Discuss Question
Answer: Option A. -> two quadrant operation
Question 168. A single phase full bridge inverter can operate in load commutation mode if load consists of
  1.    RLC overdamped
  2.    RLC critically damped
  3.    RLC underdamped
  4.    RLC undamped
 Discuss Question
Answer: Option C. -> RLC underdamped
Question 169. A diac has ___________ pn junctions
  1.    Four
  2.    Two
  3.    Three
  4.    None of the above
 Discuss Question
Answer: Option B. -> Two
Question 170. A UJT is sometimes called ___________ diode
  1.    Low resistance
  2.    High resistance
  3.    Single-base
  4.    Double-base
 Discuss Question
Answer: Option D. -> Double-base

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