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Interpoles are excited by keeping them in ____________ with armature.

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Interpoles are excited by keeping them in ____________ with armature.

(a) Series

(b) Parallel

(c) Anywhere

(d) Not kept with armature

I have been asked this question by my college professor while I was bunking the class.

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

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The correct option is (a) Series

The explanation: In voltage commutation method we use interpoles to speed up the commutation process. For neutralization of reactance voltage at all loads, the interpoles must be excited by armature current by connecting them in series with armature.

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