A 220 V, separately excited D.C motor runs at 600 rpm when the armature current is 50 A with rated torque. Calculate the speed when the armature voltage is decreased to 200 volt and motor is operated with same rated torque and flux remains constant. Assume armature resistance of the motor is 0.2 Ohm. О 570 грm O 690 rpm О 631.5 грm О 360 грт

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