ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. T

ii) A shunt motor supplied at 230V, runs at 900 rpm
when the current is 30A. The resistance of the armature is
0.4 ohms. Calculate the resistance required in series with
the armature to reduce the speed to 600 rpm, assuming that
the armature current is then 20A.
[12]

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