Question

A 100 hp, 250 V, 1200 rpm DC shunt motor with an armature resistance of 0.03...

A 100 hp, 250 V, 1200 rpm DC shunt motor
with an armature resistance of 0.03 ? and a field
resistance of 41.67 ?. The motor has compensating
windings, so armature reactance can be ignored.
Mechanical and core losses may be ignored also. The
motor is driving a load with a line current of 126 A and
an initial speed of 1103 rpm. The magnetization curve is
shown in the following figure.
1. What is the motor speed if the field resistance is
increased to 50 ?? while supplying a constant-torque
load.

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