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Cascade or concatenation connection of two induction machines means

  • A.feeding the second machine's stator from the first machine's rotor
  • B.connecting both machines' stators to the same supply in parallel
  • C.coupling the two machines mechanically with no electrical connection
  • D.feeding both machines from a single variable-frequency converter

Answer: A

The slip frequency output of the first machine's rotor becomes the supply for the second, whose shaft is coupled to the first. The pair then runs at a speed set by the combined pole number, which gives additional fixed speeds without a converter.

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