8-16. A 20-hp 240-V 76-A 900 r/min series motor has a field winding of 33 turns per pole....

8-16. 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 Ω, and its field resistance is 0.06 Ω. The magnetization curve expressed in terms of magnetomotive force versus E_A’ at 900 r/min is given by the following table:

EA’	95	150	188	212	229	243
, A⋅turns	500	1000	1500	2000	2500	3000

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.