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In a short pitched coil, the coil pitch factor kp, is given by ____________

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In a short pitched coil, the coil pitch factor kp, is given by ____________

(a) kp = cosε

(b) kp = cosε/2

(c) kp = √2πfrNΦcosε

(d) kp = cosε/2cosωrt

This question was posed to me in an online quiz.

Origin of the question is Generated EMF topic in section Principles of Electro mechanical Energy Conversions of Electrical Machines

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Right option is (b) kp = cosε/2

Easy explanation: The effect of short pitched coil is to reduce the generated EMF, and this reduction factor is cosε/2, and is referred to as coil pitch factor.

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