Question: 5 . A 5 0 0 V , 5 0 kW , 1 0 - pole DC shunt machine running as a generator at 7

5. A 500 V,50 kW,10-pole DC shunt machine running as a generator at 750 RPM supplies a load at rated voltage while the armature current is 100 A. Given that the machine's armature has 600 lap-wound conductors, The armature and shunt field resistances are 0.152 and 250\Omega , respectively. Find the useful flux per pole. Find the speed and efficiency if the same machine now works as a motor while taking 50 kW from the supply. Also, discuss the nature of speed-torque characteristics of a DC shunt motor.

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