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  • Question

  • A thyristor needs protection against


  • Options
  • A. high A thyristor needs protection against high high both high and high either high or high Both high and
  • B. high A thyristor needs protection against high high both high and high either high or high Both high and
  • C. both high A thyristor needs protection against high high both high and high either high or high Both high and and high A thyristor needs protection against high high both high and high either high or high Both high and
  • D. either high A thyristor needs protection against high high both high and high either high or high Both high and or high A thyristor needs protection against high high both high and high either high or high Both high and

  • Correct Answer
  • both high and high  

    Explanation
    Both high A thyristor needs protection against high high both high and high either high or high Both high and and high A thyristor needs protection against high high both high and high either high or high Both high and can destroy SCR.

    Power Electronics problems

    Search Results

    • 1. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it

    • Options
    • A. offers a much wider available bandwidth
    • B. does not suffer from atmospheric at tenuation
    • C. permits the use of smaller antenna
    • D. does not suffer from rain attenuation
      • Discuss
    • 2. Depending on the technique used, digitized television requires a bit rate between __________ millions.

    • Options
    • A. 40 and 92.5
    • B. 25 and 60
    • C. 30 and 82.5
    • D. 2
      • Discuss
    • 3. In the context of error detection in satellite transmission, ARQ stands for

    • Options
    • A. Automatic Repeat Request
    • B. Automatic Relay Request
    • C. Accelerated Recovery Request
    • D. Automatic Radiation Quenching
      • Discuss
    • 4. A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.

    • Options
    • A. 100
    • B. 270
    • C. 470
    • D. 540
      • Discuss
    • 5. Master control facility (MCF) for INSAT-2 series satellites is located at

    • Options
    • A. Madras
    • B. New Delhi
    • C. Leh
    • D. Hassan
      • Discuss
    • 6. All inverters use forced commutation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Assertion (A): A dual converter may be circulating current type or non circulating current type.

      Reason (R): In circulating current dual converter only one converter can be operated at one time.


    • 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
    • 8. The two modes of operation of three phase bridge inverters are known as

    • Options
    • A. 60° mode and 120° mode
    • B. 90° mode and 120° mode
    • C. 120° mode and 180° mode
    • D. 120° mode and 240° mode
      • Discuss
    • 9. A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to

    • Options
    • A. one half wave of output
    • B. one full wave of output
    • C. two full waves of output
    • D. either (b) or (c)
      • Discuss
    • 10. The number of doped regions in a SCR is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss

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