In D.C. generators the polarity of the interpoles_____________?
Correct answer: A. is the same as that of the main pole ahead
- A. is the same as that of the main pole ahead
- B. is the same as that of the immediately preceding pole
- C. is opposite to that of the main pole ahead
- D. is neutral as these poles do not play part in generating e.m.f.
Explanation
In a generator, each interpole has the same polarity as the main pole ahead of it in the direction of rotation. This produces the correcting commutating flux needed to counteract armature reaction during commutation.
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