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MCQs

Total Questions : 202 | Page 15 of 21 pages
Question 141. The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?
  1.     1200 V/µs.
  2.      800 V/µs.
  3.     600 V/µs.
  4.     1000 V/µs.
 Discuss Question
Answer: Option B. ->   800 V/µs.
Question 142. BCT is used for
  1.     Low power phase control.
  2.     Low power current control.
  3.      High power phase control.
  4.     High power current control.
 Discuss Question
Answer: Option C. ->   High power phase control.
Question 143. Which of the following is disadvantage of fast recovery diodes?
  1.      Doping is carried out.
  2.     None of these.
  3.     Recovery is only 5 µs.
  4.     Recovery is only 50 µs.
 Discuss Question
Answer: Option A. ->   Doping is carried out.
Question 144. A power semiconductor may undergo damage due to
  1.     Low di/dt.
  2.     Low dv/dt.
  3.      High di/dt.
  4.     High dv/dt.
 Discuss Question
Answer: Option C. ->   High di/dt.
Question 145. The latching current of GTO should be of order
  1.      500 mA.
  2.     100 mA.
  3.     2 A.
  4.     1 A.
 Discuss Question
Answer: Option A. ->   500 mA.
Question 146. The maximum di/dt in a SCR is
  1.     Directly proportional to inductance in the circuit.
  2.     Inversely proportional to supply voltage.
  3.     Directly proportional to supply voltage.
  4.      Both A and B.
 Discuss Question
Answer: Option D. ->   Both A and B.
Question 147. Which semiconductor device acts like a diode and two transistor?
  1.     UJT.
  2.     Diac.
  3.     SCR.
  4.      Triac.
 Discuss Question
Answer: Option D. ->   Triac.
Question 148. If the anode current is 800 A, then the amount of current required to turn off the GTO is about
  1.      200 A.
  2.     600 A.
  3.     20 A.
  4.     400 A.
 Discuss Question
Answer: Option A. ->   200 A.
Question 149. Switching frequency of SITH is
  1.     10 KHz.
  2.      100 KHz.
  3.     60 KHz.
  4.     5 KHz.
 Discuss Question
Answer: Option B. ->   100 KHz.
Question 150. A single phase full bridge inverter can operate in load commutation mode in case load consists of
  1.     RLC overdamped.
  2.     RL.
  3.      RLC underdamped.
  4.     RLC critically damped.
 Discuss Question
Answer: Option C. ->   RLC underdamped.

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