Discussion
Interpole windings are connected
Answer: D
Correct answer: in series with the armature
Interpoles must produce a flux proportional to the current being commutated, and the only way to guarantee that at every load is to carry the armature current itself. Being series-connected, they compensate automatically as the load varies, which is exactly what brush shifting could not do. Their windings are of few turns of heavy conductor for the same reason.
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