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Damper windings on a synchronous generator serve to

  • A.increase the synchronous reactance of the machine
  • B.improve the power factor at which the machine operates
  • C.suppress oscillation of the rotor after a disturbance
  • D.provide the excitation the field winding requires at no load

Answer: C

Any swing of the rotor relative to the field induces currents in the bars that oppose the motion. They also carry unbalanced and negative sequence currents, which is why they are essential on a machine supplying an unbalanced load.

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