A 2000V, 100KW, 9000 rpm series connected DC motor has an armature resistance of 6Ω and a negligible field resistance.
(a) Determine the armature current at the rated load.
(b) Determine the copper loss at the rated load.
(c) Determine the mechanical loss knowing that the no-load armature current
is 7 A at a speed of 9000 rpm.
(d) Determine the full load mechanical torque delivered to the load at a speed
of 9000 rpm.
(e) Determine the efficiency of the motor.