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Armature resistance control method is used for the speed _____________

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Armature resistance control method is used for the speed _____________

(a) Above rated speed

(b) Below rated speed

(c) Can be used anywhere

(d) Can’t tell

I have been asked this question during an online interview.

My query is from DC Motor Basics -2 topic in portion DC Motors of DC Machines

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Best answer
Correct choice is (b) Below rated speed

The best explanation: In armature circuit resistance method armature resistance can be only increased, by adding another resistance in series. As a result, the back emf will decrease. Speed is directly proportional to back emf so, it will also decrease. Therefore, this method is used for below rated speed.

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