A 1000 V, 50 hp, dc series motor is used as a hoist. The motor runs at a speed of 750 rpm at full load. The armature and field resistances are 0.5 ? and 2.0 ?, respectively.

a. Calculate the motor speed and line current when the load torque is reduced by
50%.
b. For the load condition in part (a), assume a resistance of 5 ? is added in series
with the field windings. Calculate the motor speed and line current.




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