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In rheostatic series control method of armature we add ____________

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In rheostatic series control method of armature we add ____________

(a) Variable resistor in parallel with armature

(b) Variable resistor in series with armature

(c) Fixed resistor in parallel with armature

(d) Fixed resistor in series with armature

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Enquiry is from Speed Control Using Armature Control in DC Motor topic in portion DC Motors of DC Machines

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Right choice is (b) Variable resistor in series with armature

Easy explanation: In rheostatic series control method, we add variable resistance in series with the armature so that armature voltage can be varied, by varying the voltage drop at series resistor. By increasing value of series resistor speed can be decreased.

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