A dc shunt motor drives a centrifugal pump at a speed of l000 rpm when the terminal voltage and line currents are 200 V and 50 A, respectively. The armature and field resistances are 0.1 ? and 100 ?, respectively.
a. Design a starting resistance for a maximum starting current of 120 A in the
armature circuit.
b. What resistance should be added to the armature circuit to reduce the speed to
800 rpm?
c. If the terminal voltage is reduced by 25%, what is the speed of the motor?
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