A 220 V, 40 A, 900 rpm dc shunt motor has armature circuit resistance of 0.25 Ω. If load torque is reduced to 70% of its full load value and a resistance of 3 Ω is inserted in series with armature circuit, armature reaction weakens the field flux by 5% at full load and 3% at 70% of full load. The speed of motor when load torque is reduced to 70% is __________ (in rpm)
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