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MCQs

Total Questions : 202 | Page 19 of 21 pages
Question 181. The UJT may be used as ___________
  1.    Am amplifier
  2.    A sawtooth generator
  3.    A rectifier
  4.    None of the above
 Discuss Question
Answer: Option B. -> A sawtooth generator
Question 182. 1
  1.    60°
  2.    120°
  3.    100°
  4.    Insufficient data
 Discuss Question
Answer: Option B. -> 120°
Question 183. The normal way to turn on a diac is by ___________
  1.    Gate current
  2.    Gate voltage
  3.    Breakover voltage
  4.    None of the above
 Discuss Question
Answer: Option C. -> Breakover voltage
Question 184. The ____________ region in a power diode increases its reverse voltage blocking capacity
  1.    pn junction
  2.    drift
  3.    potential barrier
  4.    depletion layer
 Discuss Question
Answer: Option B. -> drift
Question 185. In case of circulating current type dual converters, the reactor is inserted between
  1.    no reactor is used in case of circulating type dual converter
  2.    across the load
  3.    supply and converter
  4.    between the converters
 Discuss Question
Answer: Option D. -> between the converters
Question 186. In a half wave bridge inverter circuit, the power delivered to the load by each source is given by
  1.    2(Vs x Is)
  2.    Vs x Is
  3.    (Vs x Is)/2
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> (Vs x Is)/2
Question 187. A UJT has ___________
  1.    Two pn junctions
  2.    One pn junction
  3.    Three pn junctions
  4.    None of the above
 Discuss Question
Answer: Option B. -> One pn junction
Question 188. A single-phase semi-converter is having continuous conduction, as such each thyristor will conduct for an angle of
  1.    α
  2.    π
  3.    α+π
  4.    π-α
 Discuss Question
Answer: Option D. -> π-α
Question 189. The series-inverter control method is a/an
  1.    external frequency control method
  2.    external voltage control method
  3.    internal voltage control method
  4.    none of the mentioned
 Discuss Question
Answer: Option B. -> external voltage control method
Question 190. In the continuous conduction mode if the firing angle of the converter is increased beyond _________ degrees the converter operates in the _______ mode
  1.    90, rectifier
  2.    180, inverter
  3.    90, inverter
  4.    180, rectifier
 Discuss Question
Answer: Option C. -> 90, inverter

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