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The absence of compensating winding lead to __________

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The absence of compensating winding lead to __________

(a) statically induced emf in armature

(b) fluctuations in supply

(c) reduction in the flux

(d) any of the mentioned

I have been asked this question in homework.

I'd like to ask this question from Effect of Brush Shift and Compensation Windings in portion DC Machines of Electrical Machines

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Right choice is (a) statically induced emf in armature

To elaborate: The static emf induced inside gets reduced due to the armature reaction in large machines when there is no compensating winding present.

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