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MCQs

Total Questions : 202 | Page 16 of 21 pages
Question 151. The function of snubber circuit connected across the SCR is to
  1.     decrease di / dt.
  2.     decrease dV / dt.
  3.      suppress dV / dt.
  4.     increase dV / dt.
 Discuss Question
Answer: Option C. ->   suppress dV / dt.
Question 152. Practical way of obtaining static voltage equalization in series connected SCRs is by the use of
  1.     one resistor in series with each SCR.
  2.      resistors of the same value across each SCR.
  3.     one resistor across the string.
  4.     resistors of different values across each SCR.
 Discuss Question
Answer: Option B. ->   resistors of the same value across each SCR.
Question 153. What is the duty cycle of a chopper ?
  1.    Ton/Toff
  2.    Ton/T
  3.    T/Ton
  4.    Toff x Ton
 Discuss Question
Answer: Option B. -> Ton/T
Question 154. A triac is equivalent to two SCRs ___________
  1.    In parallel
  2.    In series
  3.    In inverse-parallel
  4.    None of the above
 Discuss Question
Answer: Option C. -> In inverse-parallel
Question 155. When the temperature increases, the inter-base resistance (RBB) of a UJT ___________
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Increases
Question 156. After peak point, the UJT operates in the ___________ region
  1.    Cut-off
  2.    Saturation
  3.    Negative resistance
  4.    None of the above
 Discuss Question
Answer: Option C. -> Negative resistance
Question 157. Which of the following is not a characteristic of UJT?
  1.    Intrinsic stand off ratio
  2.    Negative resistance
  3.    Peak-point voltage
  4.    Bilateral conduction
 Discuss Question
Answer: Option D. -> Bilateral conduction
Question 158. In case of current commutation of SCR
  1.    a diode is connected in parallel with the main SCR
  2.    a diode is connected in anti-parallel with the main SCR
  3.    a diode is connected in series with the main SCR
  4.    none of the mentioned
 Discuss Question
Answer: Option B. -> a diode is connected in anti-parallel with the main SCR
Question 159. Single phase half controlled converters are most suitable for loads requiring ___________________ voltage and current
  1.    bidirectional
  2.    unidirectional
  3.    unidirectional as well as bidirectional
  4.    none of the above
 Discuss Question
Answer: Option B. -> unidirectional
Question 160. The TRIAC is most sensitive in the _________ quadrants
  1.    1st & 3rd with positive gate current
  2.    1st with positive gate current & 3rd with negative gate current
  3.    3rd with positive gate current & 1rd with negative gate current
  4.    1st & 3rd with negative gate current
 Discuss Question
Answer: Option B. -> 1st with positive gate current & 3rd with negative gate current

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