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Polarity of interpoles is one pole ahead in the direction of armature rotation in _____________

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Polarity of interpoles is one pole ahead in the direction of armature rotation in _____________

(a) Motor

(b) Generator

(c) Always ahead

(d) Always behind

I had been asked this question in an online interview.

This interesting question is from Commutation Process -1 in division Commutation Process & Excitation Methods of DC Machines

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The correct answer is (b) Generator

To elaborate: polarity of an interpole is that of the main pole ahead in the direction of armature rotation for the generating mode and that of the main pole left behind with respect to the direction of rotation for motoring mode.

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