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What is the size of interpolar air gap compare to main pole air gap?

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What is the size of interpolar air gap compare to main pole air gap?

(a) Small

(b) Same

(c) More

(d) Can be of any size

The question was asked by my college director while I was bunking the class.

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

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Correct answer is (c) More

Explanation: The interpolar air-gap is kept larger than that of the main pole so that their magnetic circuit is linear resulting in cancellation of the reactance voltage (a linear derivative term) at all loads. Large air-gap results in greater amount of leakage flux which is accommodated by tapering the interpoles with a wider base.

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