A separately excited DC motor, its rated voltage UN = 220 V; rated speed nN = 1500 r/min; rated line current IN = 41.1 A, and the armature resistance Ra = 0.4 W, it is running at rated constant torque load (full load) condition, calculate the following: 1) Inserting a resistance Rad = 1.65 series with the armature circuit, calculate the steady speed of the motor. 2) Decreasing the voltage at 110 V, calculate the steady speed of the motor. 3) Decreasing the flux 10, calculate the steady speed of the motor.