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A synchronous condenser is a synchronous machine run

  • A.at a speed below the synchronous value of the supply
  • B.on no load and over-excited to supply reactive power
  • C.on full load and under-excited to absorb reactive power
  • D.as a generator driven by a prime mover of its own

Answer: B

With no mechanical load it draws only enough real power for its own losses, and its excitation determines how much reactive power it exchanges. Static compensators have largely replaced it, but the principle is identical.

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