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The active power a synchronous generator delivers to a network is adjusted by

  • A.the setting of its prime mover governor
  • B.the field excitation of the machine
  • C.the tap position of its step-up transformer
  • D.the phase sequence of its stator connections

Answer: A

Correct answer: the setting of its prime mover governor

Real power comes from the prime mover, so more power means more steam, water or fuel - a change to the governor setting. Excitation controls the reactive power and the terminal voltage, not the real power. This separation of the two controls is the foundation of power system operation.

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