Synchronous Motors
When a synchronous motor is pulled out of synchronism, the stator current ________

Is increased too much
Become zero
Is decreased too much
Remains unchanged

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

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