A four-pole, three-phase induction motor rotates at 1680 rev/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.


Analysis:

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