6. The effect of increasing load on a synchronousmotor running with normal excitation is toA. 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 isincreased, its armature currents in increasedprovided it isA. Normally-excitedB. Over-excitedC. Under-excitedD. All of the aboveTop8. When load on a synchronous motor runningwith normal excitation is increased, armaturecurrent drawn by it increases becauseA. Back e.m.f. E₁ becomes less than appliedvoltage VB. Power factor is decreasedC. Net resultant voltage ER in armature isincreasedD. Motor speed is reduced

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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.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 3SQ: What are typical applications of synchronous motors?

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Question

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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