The speed of a separately excited dc motor is controlled by means of a three phase semi converter from a three 415v, 50 hz supply. the motor constants are inductance and resistance of 15 mh and 1.2 ohms respectively armature constant 1.5 v/rad/sec. calculate speed of the motor at a torques of 75 n-m, when the converter is fired at 45 degrees. neglect losses in the converter.