Draw the capability curve of the synchronous machine, which has following equivalent circuit parameters and limiting conditions, in the first quadrant of the torque-speed plane. The speed range is from 0 r/min to 6000 r/min.

In this problem, the magnitude of the field current should be equal to or less than the rated value, where the rated power, 200 Hp, occurs with the frequency, 60 Hz, voltage, 380 V, current 240 A. With the speed (r/min) as the horizontal axis, draw simultaneously the torque, the magnitude of the line-to-line stator voltage in rms, the magnitude of the line current in rms, the power factor at the terminal of the machine, and the mechanical power as the vertical axis.