With reference to the output waveform given in the figure

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With reference to the output waveform given in the figure below, output of the converter will be free from 5th harmonic, when

1. α = 72°
2. α = 36°
3. α = 150°
4. α = 120°

Correct Option: A

To eliminate nth harmonic,
nd = π

⇒ d =	π
	n

and α = 2d =	2π	=	2π	= 72°
	n		5