A shunt motor connected across a 400 V supply takes a total power of 8 kW and runs at 600 rev/min. The filed coil and armature has a resistance of 200 N and 0.6 N, respectively. Calculate: (i) The field current and the armature current, (ii) The back e.m.f., (iii) The values of the armature current and of the speed if the magnetic flux is reduced by 30% and the load torque is increased by 40%.

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A shunt motor connected across a 400 V supply takes a total power of 8 kW and runs
at 600 rev/min. The filed coil and armature has a resistance of 200 N and 0.6 N,
respectively. Calculate:
(i) The field current and the armature current,
(ii) The back e.m.f.,
(iii) The values of the armature current and of the speed if the magnetic flux is
reduced by 30% and the load torque is increased by 40%.
Transcribed Image Text:A shunt motor connected across a 400 V supply takes a total power of 8 kW and runs at 600 rev/min. The filed coil and armature has a resistance of 200 N and 0.6 N, respectively. Calculate: (i) The field current and the armature current, (ii) The back e.m.f., (iii) The values of the armature current and of the speed if the magnetic flux is reduced by 30% and the load torque is increased by 40%.
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