Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be

None of these
more than the supply voltage
equal to the supply voltage
less than the supply voltage

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

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