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Fifth lowest order harmonic present in 3-Φ fully controlled rectifier is __________(a) 15^th(b) 17^th(c) 13^th(d) 12^thThe question was asked in an online interview.This intriguing question originated from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

Correct CHOICE is (b) 17^th

The best explanation: Only 6k±1 order harmonics are PRESENT in 3-Φ fully CONTROLLED RECTIFIER. The fifth LOWEST order harmonic is 17^th harmonic for k=3. Third order harmonics are absent in 3-Φ fully controlled rectifier.



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