Discussion
The distribution factor of a winding is less than unity because
Answer: D
Correct answer: the coil emfs are displaced in phase from one another
The coils of a phase lie in successive slots, so their emfs are displaced in time phase by the slot angle and must be added as phasors rather than arithmetically. The phasor sum is necessarily less than the arithmetic sum, and the ratio is the distribution factor. The compensation is a far more sinusoidal output waveform.
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