1. A 60-Hz, four-pole, three-phase induction motor delivers 35 kW of mechanical (output) power. At a certain operating point the machine has 4 percent slip and 87 percent efficiency. Determine the torque delivered to the load and the total electrical (input) power consumed by the motor.
2. A four-pole, three-phase induction motor rotates at 16,800 r/min when the load is 140 N-m. The motor is 85 percent efficient.
a. Determine the slip at this operating condition.
b. For a constant-power, 20-kW load, determine the operating speed of the machine.
c. Sketch the motor and load torque-speed curves for the load of part b. on the same graph. Show numerical values.