Question

A 440V DC shunt motor has a no-load speed of 2000 RPM. The motor runs at 1000 RPM at full-load torque, reduced armature voltage, and full field current (field flux). If the load torque is reduced by 50% of the rated value, with armature voltage and field voltage held constant, the speed increases to 1050 RPM. Calculate the armature voltage drop at full load. Neglect the effect of armature reaction.