Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will fail to pull into step
Will refused ro start
Will overheat in spots
Will not come upto speed

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Synchronous Motors
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have

leading power factor with under-excitation
leading power factor with over-excitation
lagging power factor with over-excitation
no change of power factor

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