Question: 250-V, (A+50)hp, 90% efficiency, dc motor with an armature resistance of 0.1ohms. It is desired to design a starter circuit for this motor which

250-V, (A+50)hp, 90% efficiency, dc motor with an armature resistance of 0.1ohms. It is desired to design a starter circuit for this motor which will limit the maximum starting current to twice its rated value and which will switch out sections of resistance as the armature current falls to its rated value. (a) How many stages of starting resistance will be required to limit the current to the range specified? (b) What must the value of each segment of the resistor be? At what voltage should each stage of the starting resistance be cut out?

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