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Which of these is the chief practical disadvantage of the synchronous motor?

  • A.Its invariably lagging power factor in service
  • B.Its need for a starting arrangement and an excitation system
  • C.Its variable speed under changing load conditions
  • D.Its inability to be built at large ratings

Answer: B

Neither is required by a cage induction machine, and together they are what confine the synchronous motor to large or special installations. Its speed is exactly constant and its power factor is adjustable, both of which are advantages.

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