A 300 v 60 a 1200 rpm series dc motor has an armature and


A 300 V, 60 A, 1200 rpm series dc motor has an armature and series field resistance of .2 ohms each. When a .10 ohm resistance is connected in parallel to the winding, the motor's torque is doubled. Neglecting rotational losses, calculate a) the armature current b) speed and c) efficiency?

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Electrical Engineering: A 300 v 60 a 1200 rpm series dc motor has an armature and
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