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A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of...

A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of 12 ohm/phase. The motor takes 12,000kW at a line voltage of 13,200V. If the line current is adjusted so that the excitation voltage is 9000V/phase:

a. What is the torque angle?

b. At what power factor is the motor operating?

c. What is its armature current?

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