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The power lost in a fluid coupling at a slip \( s \) is

  • A.the input power divided by the slip of the coupling
  • B.independent of the slip at which the coupling operates
  • C.zero
  • D.the slip times the input power

Answer: D

Exactly as in an induction machine's rotor, a fraction equal to the slip is dissipated as heat in the oil. Running a fluid coupling at thirty per cent slip to reduce the speed therefore wastes thirty per cent of the input.

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