A 600 V, dc shunt motor has armature and field resistances of l.5 ? and 600 ?, respectively. When the motor runs unloaded, the line current is 3 A, and the speed is 1000 rpm.
a. Calculate motor speed when the load draws an armature current of 30 A.
b. If the load is constant-torque type, what is the motor speed when 3 ? resistance
is added to the armature circuit?
c. Calculate the motor speed if the field is reduced by 10%.
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