Single-Phase HW AC-DC-3 MCQ

Test your knowledge with important Single-Phase HW AC-DC-3 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Single-Phase HW AC-DC-3 MCQs at Bissoy

• Choose the incorrect statement with respect to the use of FD in half-wave circuits.
  ক

  Input pf is improved

  খ

  Load current waveform is improved

  গ

  It prevents the load voltage from becoming negative

  ঘ

  Reduces the reverse voltage (PIV) faced by the SCR
• A single phase half-wave controlled rectifier has 400 sin314t as the input voltage and R as the load. For a firing angle of 60°,the average output voltage is
  ক

  200/π

  খ

  300/π

  গ

  100/π

  ঘ

  400/π
• A single-phase HW rectifier with a FD is supplied by Vs = 240 V, 50 Hz, AC with a load R = 10 Ω, L = 0.5 mH and a firing angle α = 30°. Find the average value of the load current.
  ক

  10 A

  খ

  0.063 A

  গ

  6.3 A

  ঘ

  0.1 A
• A single-phase half wave rectifier with a FD is supplied by Vs = 240 V, AC with a load R = 10 Ω, L = 0.5 mH and a firing angle α = 30°. Find the average value of the load voltage.
  ক

  50 V

  খ

  100 V

  গ

  150 V

  ঘ

  200 V
• In a single-phase half-wave circuit with RL load and a freewheeling diode, the freewheeling period is
  ক

  0 to π

  খ

  α to π+α

  গ

  π to 2π+α

  ঘ

  π/2 to 2π-α
• In a single-phase half-wave circuit with RL load and a freewheeling diode, the load voltage during the freewheeling period will be
  ক

  zero

  খ

  positive

  গ

  negative

  ঘ

  positive than negative
• The output voltage waveform of the below given circuit would be the same that obtained from a
  ক

  full-wave R load circuit

  খ

  half-wave R load circuit

  গ

  half-wave RL load circuit

  ঘ

  full-wave RL load with freewheeling diode
• In the below given circuit, when the commutating diode or FD is conducting than the
  ক

  SCR has reverse bias voltage and the load current is zero

  খ

  SCR has reverse bias voltage and the load current is positive

  গ

  SCR has forward bias voltage and the load current is zero

  ঘ

  SCR has forward bias voltage and the load current is positive
• In the below given circuit, the FD (Freewheeling diode) is forward biased at ωt =
  ক

  0

  খ

  α

  গ

  π

  ঘ

  2π