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MCQs

Total Questions : 202 | Page 20 of 21 pages
Question 191. The load voltage of a chopper can be controlled by varying the
  1.    duty cycle
  2.    firing angle
  3.    reactor position
  4.    extinction angle
 Discuss Question
Answer: Option A. -> duty cycle
Question 192. In case of TRC (Time Ratio Control), _________ is varied
  1.    firing angle
  2.    load cycle
  3.    duty cycle
  4.    load angle
 Discuss Question
Answer: Option C. -> duty cycle
Question 193. In the ___________ type of chopper, two stage conversions takes place
  1.    AC-DC
  2.    AC link
  3.    DC link
  4.    None of the mentioned
 Discuss Question
Answer: Option B. -> AC link
Question 194. In the three-phase bridge inverter, each step consists of
  1.    30°
  2.    60°
  3.    90°
  4.    will depend on firing angle
 Discuss Question
Answer: Option B. -> 60°
Question 195. In an inverter, if the fundamental frequency is 50 Hz, if third harmonic is eliminated, then frequencies of other components in the output voltage wave, in Hz, would be
  1.    250, 350, 500, higher frequencies
  2.    50, 250, 350, 500
  3.    50, 250, 350, 550
  4.    none of these
 Discuss Question
Answer: Option C. -> 50, 250, 350, 550
Question 196. Circulating current flows
  1.    from load to converters
  2.    from one converter to another converter
  3.    in the whole circuit
  4.    none of the mentioned
 Discuss Question
Answer: Option B. -> from one converter to another converter
Question 197. A Triac has three terminals viz ___________
  1.    Drain, source, gate
  2.    Two main terminal and a gate terminal
  3.    Cathode, anode, gate
  4.    None of the above
 Discuss Question
Answer: Option B. -> Two main terminal and a gate terminal
Question 198. The device that does not have the gate terminal is ___________
  1.    Triac
  2.    FET
  3.    SCR
  4.    Diac
 Discuss Question
Answer: Option D. -> Diac
Question 199. For a single phase thyristor circuit with R load & firing angle α, the conduction angle can be given by
  1.    π+α
  2.    2π+α
  3.    π-α
  4.    α
 Discuss Question
Answer: Option C. -> π-α
Question 200. 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

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