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A dc shunt motor has external resistances of Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping | |
A. | Rf maximum and Ra minimum. [Wrong Answer] |
B. | Ra maximum and Rf maximum. [Wrong Answer] |
C. | Ra minimum and Rf maximum. [Wrong Answer] |
D. | Ra maximum and Rf minimum. [Correct Answer] |