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A 230-V DC shunt motor has armature circuit resistance of 0.25 ? and field circuit resistance...

A 230-V DC shunt motor has armature circuit resistance of 0.25 ? and field circuit resistance of 115 ?. At
full load armature draws a current of 38 A and the speed is measured at 1050 rpm. Find the developed
torque.
The field rheostat is now changed so that total field resistance is 144 ?. Find the speed under this condition.
Assume that the armature current does not change. Assuming the rotational losses amount to 600 W, find the
efficiency under this condition.

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