8-12. The motor is now connected differentially compounded.(a) If what is the no-load spe...

8-12. The motor is now connected differentially compounded.

(a) If what is the no-load speed of the motor?

(b) What is the motor's speed when the armature current reaches 20 A? 40 A? 60 A?

(c) Calculate and plot the torque-speed characteristic curve of this motor.