A separately excited 300V DC motor has an armature resistance of 1ohm and a field resistance of 100 ohm. The field Voltage is 200V. The no load speed is 1200 rpm and no load armature current 2A.
a) find the motor speed when the armature current is 2A.
b) Find the motor's rotational looses.
c) Sketch the typical torque - speed characteristics of the motor.