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

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Electrial Engineering MCQ on 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

  1. Increase in back EMF But decrease in armature current
  2. Increase in both armature current and power factor angle
  3. Increase in both armature current and power factor which is lagging
  4. Increase in torque angle but decrease in back EMF

Correct answer: 2. Increase in both armature current and power factor angle

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