Synchronous Motors
If excitation of a synchronous motor running with a constant load is decreased from its normal value, ignoring effects of armature reaction, it leads to
- A. increase in both armature current and power factor angle
- B. increase in back e.m.f. but decrease in armature current
- C. increase in both armature current and power factor which is lagging
- D. increase in torque angle but decrease in back e.m.f.