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6. The effect of increasing load on a synchronous motor running with normal excitation is to A. Increase both its Ia and p.f. B. Decrease Ia but increase p.f. C. Increase Ia but decrease p.f. D. Decrease both its Ia and p.f.

6. The effect of increasing load on a synchronous motor running with normal excitation is to A. Increase both its Ia and p.f. B. Decrease Ia but increase p.f. C. Increase Ia but decrease p.f. D. Decrease both its Ia and p.f.

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
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6. The effect of increasing load on a synchronous motor running with normal excitation is to A. Increase both its Ia and p.f. B. Decrease Ia but increase p.f. C. Increase Ia but decrease p.f. D. Decrease both its Ia and p.f. 7. When load on a synchronous motor is increased, its armature currents in increased provided it is A. Normally-excited B. Over-excited C. Under-excited D. All of the above Top 8. When load on a synchronous motor running with normal excitation is increased, armature current drawn by it increases because A. Back e.m.f. E₁ becomes less than applied voltage V B. Power factor is decreased C. Net resultant voltage ER in armature is increased D. Motor speed is reduced
Transcribed Image Text:6. The effect of increasing load on a synchronous motor running with normal excitation is to A. Increase both its Ia and p.f. B. Decrease Ia but increase p.f. C. Increase Ia but decrease p.f. D. Decrease both its Ia and p.f. 7. When load on a synchronous motor is increased, its armature currents in increased provided it is A. Normally-excited B. Over-excited C. Under-excited D. All of the above Top 8. When load on a synchronous motor running with normal excitation is increased, armature current drawn by it increases because A. Back e.m.f. E₁ becomes less than applied voltage V B. Power factor is decreased C. Net resultant voltage ER in armature is increased D. Motor speed is reduced
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