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.
Answer: Option A.

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