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A 240V de shunt motor has an armature resistance of 0.4 ohm and is running at the full-load speed of 600 r.p.m. with a

A 240V de shunt motor has an armature resistance of 0.4 ohm and is running at the full-load speed of 600 r.p.m. with a full load current of 25A. The field current is constant; also a resistance of 1 ohm is added in series with the armature. Find the speed (i) at the full-load torque and (ii) at twice the full-load torque.

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