4. The rated current of a 50-hp, 250-volt shunt motor is 186 amps. The no-load speed of the motor is 850 rpm. The combi

[answerhappygod]

4. The rated current of a 50-hp, 250-volt shunt motor is 186amps. The no-load speed of the motor is 850 rpm. The combined armature and commutating fieldresistance is 0.052 ohm. The shunt field resistance is 150 ohms. It is desiredthat the starting torque of the motor is equal to the rated load torque.Determine: a. total initial resistance of the starter b. armature current when the speed becomes 25% of the no-loadspeed, with the starting resistance still in the circuit. Neglect armature dropwith no-load and armature reaction.