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Increasing the mechanical load on a synchronous motor at constant excitation causes the load angle to

  • A.stay exactly the same, only the current increasing
  • B.decrease, and the armature current with it
  • C.increase, and the armature current with it
  • D.decrease, while the armature current increases

Answer: C

The rotor falls further behind the field until the developed torque matches the load, which lengthens the phasor difference driving the current. The speed cannot change at all, which is the machine's defining property.

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