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  • Question
  • 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

  • Correct Answer
  • A is correct but R is wrong 

    Explanation
    In circulating current dual converter both converters operate together.

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    • 1. All inverters use forced commutation.

    • Options
    • A. True
    • B. False
    • Discuss
    • 2. A thyristor needs protection against

    • Options
    • A. high
    • B. high
    • C. both high and high
    • D. either high or high
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. The number of doped regions in a SCR is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
    • Discuss
    • 9. A dc circuit breaker must use

    • Options
    • A. natural commutation
    • B. forced commutation
    • C. both natural and forced commutation
    • D. either natural or forced commutation
    • Discuss
    • 10. In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be

    • Options
    • A. 30 A
    • B. 152 A
    • C. 15 A
    • D.
    • Discuss


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