A thyristorised, three phase, fully controlled converter

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A thyristorised, three phase, fully controlled converter feeds a dc load that draws a constant current. Then input ac line current to the converter has

1. an rms value equal to the dc load current
2. an average value equal to the dc load current
3. a peak value equal to the dc load current
4. a fundamental frequency component, whose rms value is equal to the dc load current

Correct Option: C

NA