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A synchronous motor that loses synchronism will

  • A.accelerate to twice its synchronous speed
  • B.run as an induction motor at its rated torque indefinitely
  • C.stall or run with severe pulsations
  • D.continue to run smoothly at a slightly reduced speed

Answer: C

Once the torque angle exceeds the pull-out value the rotor slips poles, and the torque then alternates in sign and the machine draws heavy pulsating current. Protection trips it, and the load must be reduced before it can be resynchronised.

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