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 tellI 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

Armature resistance control method is used for the speed _____________

1.	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 tellI 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
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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