5.10 A 36, 460 V, 60 Hz, six-pole induction motor has the following single-phase equivalent circuit parameters. R₁ = 0.22 X₁ = 1.055 2 X = 1.055 2 R = 0.28 Xm-33.90 The induction motor is connected to a 36, 460 V, 60 Hz supply. (a) Determine the starting torque. (b) Determine the breakdown torque and the speed at which it occurs. (c) The motor drives a load for which T₁ 1.8 N- .m. Determine the speed at which the motor will drive the load. Assume that near the synchronous speed the motor torque is proportional to slip. Neglect rotational losses. Review Chapter 8, from 8.11 to 8.12, starting from Page 844 in the e-text book. Then review the problem examples from 8.11 to 8.25 starting from page 848. Answer the following questions: 5.8 A 36, 280 V, 60 Hz, 20 hp, four-pole induction motor has the following equivalent circuit parameters. R₁ = 0.122, R = 0.12 X₁ = X = 0.25 Xm=10.02 The rotational loss is 400 W. For 5% slip, determine (a) The motor speed in rpm and radians per sec. (b) The motor current. (c) The stator cu-loss. (d) The air gap power. (e) The rotor cu-loss. (f) The shaft power. (g) The developed torque and the shaft torque. (h) The efficiency. Use the IEEE-recommended equivalent circuit (Fig. 5.15).