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Mark the correct option which affects the terminal voltage of a dc shunt motor.

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Mark the correct option which affects the terminal voltage of a dc shunt motor.

(a) Armature reaction

(b) Source voltage variations

(c) Compensating winding

(d) Any of the mentioned

The question was posed to me in a job interview.

I want to ask this question from Operating Characteristics of DC Motors in portion DC Motors of Electrical Machines

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The correct choice is (c) Compensating winding

To explain I would say: If the dc motor has compensating winding, flux will remain constant regardless of load.

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