A 3-phase synchronous motor is operating at a given load. If an increase in excitation reduces the armature current, it can be concluded that the motor is
A. operating at lagging power factor and absorbing reactive power from the mains.
B. operating at leading power factor and delivering reactive power to the mains.
C. either (a) or (b).
D. none of these.
Answer:A
A 3-phase synchronous motor is operating at a given load. If an increase in excitation reduces the armature current, it can be concluded that the motor is
A. operating at lagging power factor and absorbing reactive power from the mains. B. operating at leading power factor and delivering reactive power to the mains. C. either (a) or (b). D. none of these.