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A synchronous condenser can be used to absorb reactive power as well as supply it, by

  • A.disconnecting its damper winding from the rotor
  • B.driving it above its synchronous speed
  • C.under-exciting the machine
  • D.reversing the direction of rotation of the machine

Answer: C

Below the excitation the terminal voltage requires, the machine draws reactive current from the network, which is useful on a lightly loaded cable system with a rising voltage. That two-way capability is what distinguishes it from a fixed capacitor bank.

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