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________?
Alagging power factor with over-excitation
Bno change of power factor
Cleading power factor with under-excitation
Dleading power factor with over-excitation
Correct answer
D. leading power factor with over-excitation
Explanation
The correct answer is leading power factor with over-excitation.