If all the SCRs of a three-phase PAC are replaced by diodes, when would they be triggered?

1. A Option A: 120 degrees before the zero crossing of the corresponding line voltages
2. B Option B: 60 degrees before the zero crossing of the corresponding line voltages
3. C Option C: 60 degrees after the zero crossing of the corresponding line voltages
4. D Option D: 120 degrees after the zero crossing of the corresponding line voltages

Answer checked 11 October 2026 · How we write and check questions