Fifth harmonic component of the induced voltage in 3-phase

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Fifth harmonic component of the induced voltage in 3-phase ac generator can be entirely eliminated by using a winding pitch of

1. 2/3
2. 4/5
3. 5/6
4. 6/7

Correct Option: B

Coil span factor for n_th harmonic,

k_c = cos	1	n∊
	2

where, ε is angle by which the coil is short of full pitch.

∴ k_c = cos	1	× 5		1 −	4		π = 0
	2				5

Thus fifth harmonic component gets eliminated by using a coil pitch of 4/5.