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

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

A).  no change of power factor

B).  lagging power factor with over-excitation

C).  leading power factor with under-excitation

D).  leading power factor with over-excitation

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