A separately, excited Dc motor fed from 3-phase semi-controlled rectifier develops a full load torque at 1500 rpm. When firing angle Zero the armature taking 50A and having having an armature resistance of 0.5ohm. when the motor back emf Constant is 0.25 V/rpm. Calculate the supply Voltage per phase, find also the range of angle required to give speed between 1500rpm and 750 rpm at full load torque.

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