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A 25-hp, 240V, DC shunt motor has armature and field resistances of 0.2 ? and 120...

A 25-hp, 240V, DC shunt motor has armature and field resistances of 0.2 ? and 120 ?, respectively. At no load and rated voltage, the motor draws a line current of 5A and its speed is 1250 rpm.

When driving a certain load, the input to the motor is 15KW. For this condition, find:

a.The speed of the motor

b.The developed torque

The efficiency of the motor at this load

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