Question: EX 2 . A 3 - phase, 1 1 0 - hp , 4 8 0 - V , star - connected synchronous motor has

EX2. A 3-phase, 110-hp,480-V, star-connected synchronous motor has a synchronous impedance per phase of 0.15+j1.5 ohm. The excitation and torque losses are 5 kW and may be assumed constant. Calculate:
I. the line current and power factor;
II. efficiency when operating at full load with an excitation equivalent to 440 line volts.

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