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  • Question

  • Which of the following devices has two gates?


  • Options
  • A. SCR
  • B. SCS
  • C. SUS
  • D. SBS

  • Correct Answer
  • SCS 

    • Power Electronics problems

    Search Results

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

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

    • Options
    • A. UJT
    • B. PUT
    • C. Shockley diode
    • D. TRIAC
      • Discuss
    • 4. 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
    • 5. 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
    • 6. The factor ? for a UJT is about

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

    • Options
    • A. natural commutation
    • B. forced commutation
    • C. either natural or forced commutation
    • D. both natural and forced commutation together
      • Discuss
    • 8. 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
    • 9. 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
    • 10. Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode

      Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel


    • 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

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