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What is harmonic in power quality?

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To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 

(A) 12 SCRs (B) 18 SCRs (C) 36 SCRs (D) 72 SCRs

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To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 36 SCRs

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