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The natural frequency of hunting oscillation of a synchronous machine depends on

  • A.the resistance of the field winding and its inductance
  • B.the ambient temperature and the cooling arrangement
  • C.the number of commutator segments in the machine
  • D.the synchronising power coefficient and the inertia

Answer: D

It behaves as a torsional oscillator whose stiffness is the synchronising coefficient and whose mass is the inertia, so the frequency is the root of their ratio. A load fluctuating near that frequency excites the oscillation strongly.

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