A 550-V series motor takes 112A and operates at 820 r/min when the load is 75hp. if the effective armature-circuit resistance is 0.15 ohms calculate the horsepower output of the motor when the current...

A 550-V series motor takes 112A and operates at 820 r/min when the load is 75hp. if the effective armature-circuit resistance is 0.15 ohms calculate the horsepower output of the motor when the current drops to 84A, assuming that the flux is reduced by 15%