Synchronous Motors
A synchronous motor runs at speed ranging from ______

1800 to 3600 rpm
150 to 1800 rpm
3600 to 6000 rpm
None of the listed here

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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

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

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