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The belt factor is defined as the ratio of __________

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The belt factor is defined as the ratio of __________

(a) arithmetic sum of coil EMF to the phasor sum of coil EMFs

(b) phasor sum of EMF per coil to the arithmetic sum of EMF per coil

(c) phasor sum of coil EMFs to the arithmetic sum of coil EMFs

(d) phasor sum of coil EMFs to per phase voltage

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Question is from EMF Polygon topic in chapter Synchronous Machines of Electrical Machines

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Correct choice is (c) phasor sum of coil EMFs to the arithmetic sum of coil EMFs

Easy explanation: Belt factor or distribution factor or breadth factor = kd= phasor sum of coil EMFs/arithmetic sum of coil EMFs.

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