A 20-hp 240-V 76-A 900 r/min series motor has a field winding of 33 turns per pole. Its armature resistance is 0.09 W, and its field resistance is 0.06 W. The magnetization curve expressed in terms of magnetomotive force versus EA at 900 r/min is given by the following table:
Armature reaction is negligible in this machine.
(a) Compute the motor's torque, speed, and output power at 33, 67, 100, and 133 percent of full-load armature current. (Neglect rotational losses.)
(b) Plot the terminal characteristic of this machine.