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A synchronous machine run at no load purely to correct power factor is called a

  • A.brushless dc machine
  • B.load commutated inverter drive
  • C.synchronous condenser
  • D.synchronous reluctance machine

Answer: C

Over-excited and unloaded, it behaves as a variable capacitor whose output is adjusted by the field current. Static compensators have largely replaced it, but the principle is the same as an over-excited motor supplying reactive power.

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