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Electronics Engineering QUESTION #11717
Question 1
In a three-phase full-wave bridge rectifier (6-pulse), the output ripple frequency relative to the AC supply frequency is:
  • Equal to supply frequency (1×)
  • Double the supply frequency (2×)
  • Six times the supply frequency (6×)✔️
  • Three times the supply frequency (3×)
Correct Answer Explanation
A 3-phase 6-pulse bridge rectifier produces ripple at 6 times the supply frequency. With 50 Hz supply, ripple = 300 Hz. This is because six rectifier pulses occur per supply cycle (one per 60°). Higher pulse numbers reduce ripple magnitude and frequency filtering requirements — 12-pulse rectifiers give 600 Hz ripple with even lower amplitude.