What happens to a synchronous motor running under a constant load if its excitation is reduced from the normal level, assuming armature reaction is neglected?

Explanation

When the excitation of a synchronous motor is lowered from its standard value under a fixed load, and armature reaction effects are ignored, the armature current rises along with the power factor angle. This is because reduced excitation causes the motor to draw more current to maintain the load, increasing the power factor angle.