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 Options: A . &nbspno change of power factor B . &nbsplagging power factor with over-excitation C . &nbspleading power factor with under-excitation D . &nbspleading power factor with over-excitation

A synchronous motor connected to infinite bus-bars has at constant full load, 10

Question

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

Options:

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

Answer: Option D

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