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MCQs

Total Questions : 202 | Page 18 of 21 pages
Question 171. To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage
  1.    Less than
  2.    Equal to
  3.    More than
  4.    None of the above
 Discuss Question
Answer: Option C. -> More than
Question 172. If the chopper frequency is 200 Hz and on time is 2 ms, then the duty ratio would be
  1.    0.4
  2.    0.6
  3.    0.8
  4.    none of these
 Discuss Question
Answer: Option A. -> 0.4
Question 173. In case of a constant frequency system, Ton = (1/4)T
  1.    2/8 microsecond
  2.    3/8 microsecond
  3.    4/8 microsecond
  4.    5/8 microsecond
 Discuss Question
Answer: Option B. -> 3/8 microsecond
Question 174. The minimum frequency of the output voltage harmonic in a single phase fully controlled bridge converter is _________ the input supply frequency
  1.    four times
  2.    three times
  3.    two times
  4.    same
 Discuss Question
Answer: Option C. -> two times
Question 175. In pulse width modulation scheme, _________ is kept constant
  1.    ton
  2.    toff
  3.    Fs
  4.    Ts
 Discuss Question
Answer: Option A. -> ton
Question 176. In non-circulating current mode dual converters, the circulating current is avoided by
  1.    connecting a series reactor
  2.    maintaining α1 + α2 = 180°
  3.    adding an extra SCR
  4.    operating only one converter
 Discuss Question
Answer: Option D. -> operating only one converter
Question 177. In the principle of phase control
  1.    control is achieved by adjusting the firing angle of the devices
  2.    the load is on for some cycles and off for some cycles
  3.    control is achieved by adjusting the number of on off cycles
  4.    control cannot be achieved
 Discuss Question
Answer: Option A. -> control is achieved by adjusting the firing angle of the devices
Question 178. A chopper may be thought as a
  1.    Inverted with DC input
  2.    DC equivalent of an AC transformer
  3.    Diode rectifier
  4.    DC equivalent of an induction motor
 Discuss Question
Answer: Option B. -> DC equivalent of an AC transformer
Question 179. The device that exhibits negative resistance region is ___________
  1.    Diac
  2.    Triac
  3.    Transistor
  4.    UJT
 Discuss Question
Answer: Option D. -> UJT
Question 180. The Gate-Drain transfer capacitance of a MOSFET has large value in the ________________ region and small value in the ________________ region
  1.    saturation, ohmic
  2.    ohmic, saturation
  3.    triode, linear
  4.    ohmic, active
 Discuss Question
Answer: Option D. -> ohmic, active

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