Q5. A 3 phase, 15 hp, 460 V, 4 pole, 60 Hz, 17 28 rpm, Y-connected induction motor delivers full output power to a load connected to its shaft. The windage and friction loss of the motor is 750 W. Determine (i) The developed mechanical power. (ii) Air gap power (ii) Rotor copper loss Ans.: (i) 11940 W, (ii) 12437.5 W and (iii) 497.5 W.