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Cascade connection has fallen out of use because it

  • A.needs two machines to do one machine's work
  • B.cannot give any speed below the synchronous value
  • C.requires a converter of the full machine rating
  • D.gives a continuously variable speed rather than fixed steps

Answer: A

Two wound rotor machines, their slip rings and their switching are far dearer than one cage machine and a converter, and they give only a handful of fixed speeds. It survives in textbooks as an illustration of the slip relation rather than in practice.

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