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A certain 10-hp, 230-V motor has a rotational loss of 600 W, a stator copper loss of 350 W, a rotor copper loss of 350 W, and a stray load loss of 50 W. It is not known whether the motor is an induction, synchronous, or dc machine.
(a) Calculate the full-load efficiency.
(b) Compute the efficiency at one-half load, assuming that the stray-loss and rotational losses do not change with load.
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