A 280 V, separately excited DC motor with armature resistance of 122 and constant field excitation drives a load. The load torque is proportional to the speed. The motor draws a current of 30 A when running at a speed of 1000 rpm. Neglect frictional losses in the motor. The speed, in rpm, at which the motor will run, if an additional resistance of value 10 2 is connected in series with the armature, is

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A 280 V, separately excited DC motor with armature resistance of 122 and constant field
excitation drives a load. The load torque is proportional to the speed. The motor draws
a current of 30 A when running at a speed of 1000 rpm. Neglect frictional losses in the
motor. The speed, in rpm, at which the motor will run, if an additional resistance of value
10 2 is connected in series with the armature, is
Transcribed Image Text:A 280 V, separately excited DC motor with armature resistance of 122 and constant field excitation drives a load. The load torque is proportional to the speed. The motor draws a current of 30 A when running at a speed of 1000 rpm. Neglect frictional losses in the motor. The speed, in rpm, at which the motor will run, if an additional resistance of value 10 2 is connected in series with the armature, is
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