Thyristor Chopper Circuits-3 MCQ

Test your knowledge with important Thyristor Chopper Circuits-3 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Thyristor Chopper Circuits-3 MCQs at Bissoy

• A chopper circuit is fed from an input voltage of 20 V delivers a power of 16 watts. If the chopper efficiency is 80 %, then find the value of input current.
  ক

  0.64 A

  খ

  1 A

  গ

  0.8 A

  ঘ

  1.25 A
• For the step down chopper shown in the figure below, Vs = 100 V and the duty cycle of the switch is 0.8. The load is sufficiently inductive so that the load current is ripple free. The average current through the diode (D) under steady state is
  ক

  2 A

  খ

  1.6 A

  গ

  8 A

  ঘ

  6.4 A
• The speed of a separately excited dc motor is controlled below base speed by using a type-A SCR based chopper. The supply voltage is 220 V dc and the armature resistance is 0.5 Ω. Calculate the minimum value of firing angle if the motor drives a constant torque load requiring an average armature current of 30 A.
  ক

  1/2

  খ

  3/44

  গ

  59/46

  ঘ

  7/12
• Which type of commutating circuit will have highest switching losses for same rating of all the components?
  ক

  current commutated chopper

  খ

  voltage commutated chopper

  গ

  load commutated chopper

  ঘ

  forced commutated chopper
• What is the expression for design of commutation capacitance in case of a load commutated chopper circuit?
  ক

  (I x Ton)/Vs

  খ

  Cannot be determined

  গ

  (I x Ton)/2Vs

  ঘ

  (I x T)/Vs
• What is the voltage across the load when T1 and T2 are gated after charging the capacitor to Vs?
  ক

  Vs

  খ

  0

  গ

  2Vs

  ঘ

  Vs + Ldi/dt
• When T1 and T2 are conducting, which components act as the commutating components?
  ক

  T3 and T4

  খ

  All the SCRs

  গ

  T3, T4 and C

  ঘ

  T3, T4, C and FD
• In the below given commutated chopper circuit, __ and __ SCRs act together in pairs.
  ক

  T1-T2, T3-T4

  খ

  T1-T3, T2-T4

  গ

  T1-T4, T2-T4

  ঘ

  T1, T2
• Identify the below given chopper circuit.
  ক

  Type D chopper

  খ

  Type C chopper with commutating capacitor

  গ

  Load commutated step-down chopper

  ঘ

  Voltage commutated step-up chopper
• Find the expression for peak capacitor voltage in case of a current commutated chopper circuit.
  ক

  Io √(L/C)

  খ

  Vs + √(L/C)

  গ

  Vs + Io √(L/C)

  ঘ

  Zero