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  • Question

  • In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is


  • Options
  • A. 20 A
  • B. 13.33 A
  • C. 6.67 A
  • D. 3.33 A

  • Correct Answer
  • 13.33 A 

    • Power Electronics problems

    Search Results

    • 1. A cycloconverter is a group of controlled rectifiers.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The symbol in figure is for

    • Options
    • A. UJT
    • B. PUT
    • C. Shockley diode
    • D. TRIAC
      • Discuss
    • 3. The cut in voltages for germanium and silicon diodes respectively as

    • Options
    • A. 0.3 V and 0.7 V
    • B. 0.7 V and 0.3 V
    • C. 0.6 V and 0.9 V
    • D. 0.5 V and 0.7 V
      • Discuss
    • 4. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of

    • Options
    • A. 60°
    • B. 90°
    • C. 120°
    • D. 180°
      • Discuss
    • 5. An SUS is

    • Options
    • A. exactly similar to SCR but with higher rating
    • B. similar to UJT
    • C. PUT and avalanche diode connected in anti parallel
    • D. SCR and avalanche diode connected in parallel
      • Discuss
    • 6. Which of the following devices has two gates?

    • Options
    • A. SCR
    • B. SCS
    • C. SUS
    • D. SBS
      • Discuss
    • 7. The factor ? for a UJT is about

    • Options
    • A. 0.1
    • B. 0.2
    • C. 0.6
    • D. 0.9
      • Discuss
    • 8. A cycloconverter uses

    • Options
    • A. natural commutation
    • B. forced commutation
    • C. either natural or forced commutation
    • D. both natural and forced commutation together
      • Discuss
    • 9. In a half bridge inverter circuit fed by a battery of voltage V, the rms value of fundamental component of output voltage is

    • Options
    • A. 2 V
    • B.
    • C.
    • D.
      • Discuss
    • 10. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

    • Options
    • A. must be a sub-multiple of input frequency
    • B. can be any frequency
    • C. must be an even sub-multiple of input frequency
    • D. must be an odd sub-multiple of input frequency
      • Discuss

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