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A 100-hp 440-V 0.8-PF-leading D-connected synchronous motor has an armature resistance of 0.3 W and a synchronous reactance of 4.0 W. Its efficiency at full load is 96 percent.
(a) What is the input power to the motor at rated conditions?
(b) What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions?
(c) What is the reactive power consumed by or supplied by the motor at rated conditions?
(d) What is the internal generated voltage EA of this motor at rated conditions?
(e) What are the stator copper losses in the motor at rated conditions?
(f) What is Pconv at rated conditions?
(g) If EA is decreased by 10 percent, how much reactive power will be consumed by or supplied by the motor?
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A four pole, 60Hz, 10Hp, 460V, three phase induction motor operates at 1750 r/min when fully loaded and its rated frequency and rated voltage. Determine (a) synchronous speed; (b) slip speed; (c) per unit slip
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