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In shunted rheostatic armature control method ______________

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In shunted rheostatic armature control method ______________

(a) Variable resistor is added in parallel with armature

(b) Variable resistor is added in series with armature

(c) Variable resistor is added in parallel with armature and another variable resistor is added in series

(d) Variable resistor is not added in whole circuit

The question was asked in an interview.

My question comes from Speed Control Using Armature Control in DC Motor in chapter DC Motors of DC Machines

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Correct choice is (c) Variable resistor is added in parallel with armature and another variable resistor is added in series

Best explanation: In shunted armature speed control method we add one variable resistance in series with armature and one variable resistance in parallel with armature, so by varying the ratio of this resistances we can get various different speeds.

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