Question: A 2 0 h p , 2 5 0 V shunt dc motor with R A = 0 . 2 2 , R F =

A 20hp,250V shunt dc motor with RA=0.22,RF=125. At no-load and rated voltage, the speed is 1200 rpm and the armature current is 3 A . At full-load and rated voltage, the line current is 55A. Find;
a) full-load speed of the machine (15P)
b) the speed of the motor at full load, if the flux is reduced to 75% of its original value (10P)
A 2 0 h p , 2 5 0 V shunt dc motor with R A = 0 .

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