A 240V dc shunt motor with an armature resistance of 0.5 Ω has a full-load current of ___

A 240V dc shunt motor with an armature resistance of 0.5 Ω has a full-load current of 40 A.

Find the ratio of the stalling torque to the full-load torque when a resistance of 1 Ω is connected in series with the armature

A. 4
B. 12
C. 6
D. none of the above.

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Answer: A

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