SCR Commutation Techniques-1 MCQ

Test your knowledge with important SCR Commutation Techniques-1 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more SCR Commutation Techniques-1 MCQs on Bissoy. Bissoy App

• ___________ commutation technique is commonly employed in series inverters.
  ক

  line

  খ

  load

  গ

  forced

  ঘ

  external-pulse
• The natural reversal of ac supply voltage commutates the SCR in case of
  ক

  forced commutation

  খ

  only line commutation

  গ

  only natural commutation

  ঘ

  both line & natural commutation
• The type of commutation in which the pulse to turn off the SCR is obtained by separate voltage source is
  ক

  class B commutation

  খ

  class C commutation

  গ

  class D commutation

  ঘ

  class E commutation
• The type of commutation when the load is commutated by transferring its load current to another incoming thyristor is
  ক

  class A or load commutation

  খ

  class B or resonant commutation

  গ

  class C or complementary commutation

  ঘ

  class D or impulse commutation
• An SCR is connected in series with L = 5 mH and C = 20 μF. Find the resonant frequency of the circuit.
  ক

  2569 rad/s

  খ

  3162 rad/s

  গ

  2400 rad/s

  ঘ

  7889 rad/s
• In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with the initial voltage across the capacitor (Vs) = 230 V. Find the conduction time for auxiliary thyristor.
  ক

  0.23 μs

  খ

  6.57 μ

  গ

  31.41 μs

  ঘ

  56 μs
• In case of class B commutation or resonant-pulse commutation with L = 5 μH and C = 20 μC with initial voltage across the capacitor (Vs) = 230 V. Find the peak value of resonant current.
  ক

  560 A

  খ

  460 A

  গ

  360 A

  ঘ

  260 A
• The class A commutation or load commutation is possible in case of
  ক

  dc circuits only

  খ

  ac circuits only

  গ

  both DC and AC circuits

  ঘ

  none of the above mentioned
• In case of class A type commutation or load commutation with low value of R load the
  ক

  L is connected across R

  খ

  L-C is connected across R

  গ

  L is connected in series with R

  ঘ

  L-C is connected in series with R
• The thyristor turn-off requires that the anode current
  ক

  falls below the holding current

  খ

  falls below the latching current

  গ

  rises above the holding current

  ঘ

  rises above the latching current