8-14. 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 and its field resistance is The magnetization curve expressed in terms of magnetomotive force versus 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.
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