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A shunt machine connected to 250-A mains has an armature resistance of 0.12 ohms and field resistance of 100 ohms. ?

 A shunt machine connected to 250-A mains has an armature resistance of 0.12 ohms and field resistance of 100 ohms. find the ratio of the speed of the machine as a generator to the speed as a motor, if the line current is 80A in both cases.

this is the book and its deals with chapter 29 D.C MOTOR.

the answer is 1.08 but I'm not sure how the came up with the answer  

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