A 234.6 hp, 175 V, 800 revs min- DC motor is fed by a controlled 1- phase bridge converter connected to a 230 V, 1-phase 50 Hz supply. The full load armature current is 1000 A and the armature resistance is 7 mQ. (i) State, with a definition of terms, the formula of the output voltage of a fully controlled single phase rectifier. (ii) Calculate the firing angle for the motor to develop its rated full load torque at 400 revs min.