The following data apply to a 125-kW, 2300-V, three-phase, four pole, 60-Hz squirrel-cage induction motor: Stator-resistance between phase terminals = 2.23 Ω. No-load test at rated frequency and voltage: Line current = 7.7 A Three-phase power = 2870 W. Blocked-rotor test at 15 Hz: Line voltage = 268 V Line current = 50.3 A. Three-phase power = 18.2 kW

a. Calculate the rotational losses.

b. Calculate the equivalent-circuit parameters in ohms. Assume that Xl = X2.

c. Compute the stator current, input power and power factor, output power and efficiency when this motor is operating at rated voltage and frequency at a slip of 2.95 percent.