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Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments
  • Question

  • Which of these devices have four layers?


  • Options
  • A. UJT
  • B. SCR
  • C. TRIAC
  • D. SCR and TRIAC

  • Correct Answer
  • SCR 

    • Power Electronics problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. Thyristors connected in series need static and dynamic stabilizing circuits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. 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
      • Discuss
    • 5. 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
    • 6. 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
    • 7. A capacitor C farads is charged to a voltage V. It discharges through a thyristor, a diode and an inductance L. The peak current in the circuit is

    • Options
    • A. VCL
    • B.
    • C.
    • D.
      • Discuss
    • 8. A single phase converter is fed by a source having an inductance L. If load current is I0, the decrease in output voltage due to overlap is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to

    • Options
    • A. 50% of peak reverse current
    • B. 25% of peak reverse current
    • C. 10% of peak reverse current
    • D. zero value
      • Discuss
    • 10. In a semi converter feeding a resistive load,

    • Options
    • A. the waveshapes of input voltage and input current are always similar
    • B. the waveshapes of input voltage and input current can never be similar
    • C. the waveshapes of input voltage and input current are similar only if firing angle is zero
    • D. the waveshapes of input voltage and input current are similar only if firing angle is high
      • Discuss

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