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  • Question

  • A single phase half wave rectifier is feeding a resistive load. As firing angle is increased


  • Options
  • A. dc output voltage and rms output voltage decrease in the same proportion
  • B. dc output voltage and rms output voltage decrease
  • C. dc output voltage and rms output voltage increase
  • D. dc output voltage and rms output voltage increase in the same proportion

  • Correct Answer
  • dc output voltage and rms output voltage decrease 

    • Power Electronics problems

    Search Results

    • 1. In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. A chopper is a high efficiency circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In rectifier circuits, ripple factor RF and form factor FF are related as

    • Options
    • A. RF = (FF2 - 1)0.5
    • B. RF = FF
    • C. RF = FF - 1
    • D. RF = (FF - 1)0.5
      • Discuss
    • 4. Two thyristors of the same rating and specifications

    • Options
    • A. will have equal on state voltage drops
    • B. will have equal forward blocking voltage for the same current
    • C. will have different on state voltage drops
    • D. may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
      • Discuss
    • 5. In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is

    • Options
    • A. 36
    • B. 18
    • C. 12
    • D. 8
      • Discuss
    • 6. Thyristors connected in series need static and dynamic stabilizing circuits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In the basic series inverter circuit, the source current has

    • Options
    • A. low harmonic content
    • B. high harmonic content
    • C. low or high harmonic content depending on firing angle
    • D. zero harmonic content
      • Discuss
    • 8. Assertion (A): Chopper always requires forced commutation

      Reason (R): Morgan chopper uses a saturable reactor.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
      • Discuss
    • 9. Which of these devices have four layers?

    • Options
    • A. UJT
    • B. SCR
    • C. TRIAC
    • D. SCR and TRIAC
      • Discuss
    • 10. A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ?t. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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