A 250 V shunt motor has an armature resistance of 0.4 Ω and runs ata speed of 750 rev min–1 when taking a full load current of 25 A.Estimate the speed of the motor at no load when the armature currentis 3 A, assuming that the flux per pole remains constant.If the field resistance is 110 Ω, calculate the value of the resistancerequired in the field circuit to increase the speed to 1000 rev min–1 ifthe load torque remains constant.
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