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An operator wishing to change the reactive power a machine exports to the network acts upon

  • A.the phase sequence of its stator connections
  • B.its field excitation
  • C.the setting of its prime mover governor
  • D.the number of poles for which it is wound

Answer: B

Raising the excitation above the value the terminal voltage requires makes the machine export reactive power, and lowering it makes the machine absorb. That independence from the active power is what makes a synchronous machine so useful to a network.

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