a 60hp, 240V, 850r/min shunt motor has the following parameters Ra=0,030 ohms, RIP=0.011 ohms and Rf=62.0 ohms. The total losses when operating at rated conditions are 4.16kW. Determine the external resistance required in series with the armature to limit the loacked-rotor torque to 200% rated torque, if operating from a 220V supply.

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