Q. 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 (Solved)
1. no change of power factor
2. lagging power factor with over-excitation
3. leading power factor with under-excitation
4. leading power factor with over-excitation
- d. leading power factor with over-excitation