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phase reactance is 1.5 pu. (i) Find the mechanical power delivered by the motor, including all losses? (ii) if for the same load on the motor, the excitation is reduced to generat an emf of 100%, what would be the input KVA? (iii) With its excitation emf adjusted to 1.3 pu, the alternator delivers an output of 0 75 nu

phase reactance is 1.5 pu. (i) Find the mechanical power delivered by the motor, including all losses? (ii) if for the same load on the motor, the excitation is reduced to generat an emf of 100%, what would be the input KVA? (iii) With its excitation emf adjusted to 1.3 pu, the alternator delivers an output of 0 75 nu

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 3- phase, 5O Hz, 415 V, Synchronous machine operates at rated voltage and at a leading power factor of 0.95. Shaft power is 35 KW and the excitation emf is 440 V. If the per phase reactance is 1.5 pu. (i) Find the mechanical power delivered by the motor, including all losses? (ii) if for the same load on the motor, the excitation is reduced to generate an emf of 100%, what would be the input KVA? (iii) With its excitation emf adjusted to 1.3 pu, the alternator delivers an output of 0.75 pu. (including all losses)?(iv) Find the excitation voltage, load angle and the power factor?(v) Determine the load angle, armature current in per unit? (vi) With alternator output remaining constant, the alternator excitation is improved by 15%, find the new value of armature current, load angle and power deliver to bus?
Transcribed Image Text:A 3- phase, 5O Hz, 415 V, Synchronous machine operates at rated voltage and at a leading power factor of 0.95. Shaft power is 35 KW and the excitation emf is 440 V. If the per phase reactance is 1.5 pu. (i) Find the mechanical power delivered by the motor, including all losses? (ii) if for the same load on the motor, the excitation is reduced to generate an emf of 100%, what would be the input KVA? (iii) With its excitation emf adjusted to 1.3 pu, the alternator delivers an output of 0.75 pu. (including all losses)?(iv) Find the excitation voltage, load angle and the power factor?(v) Determine the load angle, armature current in per unit? (vi) With alternator output remaining constant, the alternator excitation is improved by 15%, find the new value of armature current, load angle and power deliver to bus?
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