Q24. A 220V D.C. shunt motor has an armature resistance of 0.5S2 and is excited to produce constant flux. At full load the motor runs at 1000 rpm taking an armature current of 40A. i) If a resistance of 0.82 is inserted in series with the armature, Calculate the generated emf. ii) Estimate speed at full load if the load torque is constant.

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Estimate the generated e.m.f. if, the speed increases to 1280rev/min
and the pole flux remains unchanged.
Q24.
A 220V D.C. shunt motor has an armature resistance of 0.52 and is
excited to produce constant flux. At full load the motor runs at 1000
rpm taking an armature current of 40A.
i) If a resistance of 0.82 is inserted in series with the armature, Calculate
the generated emf.
ii) Estimate speed at full load if the load torque is constant.
Transcribed Image Text:Estimate the generated e.m.f. if, the speed increases to 1280rev/min and the pole flux remains unchanged. Q24. A 220V D.C. shunt motor has an armature resistance of 0.52 and is excited to produce constant flux. At full load the motor runs at 1000 rpm taking an armature current of 40A. i) If a resistance of 0.82 is inserted in series with the armature, Calculate the generated emf. ii) Estimate speed at full load if the load torque is constant.
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