Calculate the speed of a 60-cycle, 14-pole motor if the slip is 5%

Do it 20 mins do all a and b

A 125-hp, 480-V, 50-Hz, 6-pole, Y-connected induction motor has the per-phase equivalent circuit parameters as follows: Nominal code Locked rotor, letter kVA/hp R = 0.15 2 R2 = 0.10 2 X1 = 0.360 X2 = 0.36 2 C 3.55 – 4.00 =8.362 D 4.00 – 4.50 E 4.50 – 5.00 F 5.00 – 5.60 The core-losses are 1.7 5.60 – 6.30 kW, mechanical losses are 1.8 kW, and stray losses are 50 W. a) b) Calculate the speed at the pullout torque in rpm, the pullout torque, and the starting torque using exact Thevenin parameters. c) Find the starting code letter assigned to this motor.

A 6 pole 60Hz induction motor is operating at 1172 RPM. If input power is 1.0MW, with combined stator copper and iron losses at 5% of input power, then what will the rotor copper losses be (numeric answer only expressed in kW – Hint: you must find power across the air gap and % slip to solve this problem)?