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The three main elements of a centrifugal compressor are

  • A.Inlet, throat and exit cone
  • B.Impeller, diffuser and volute or collector
  • C.Rotor, stator and nozzle
  • D.Inducer, combustor and turbine

Answer: B

The impeller adds the energy, the diffuser converts the high velocity leaving it into static pressure, and the volute collects the flow and delivers it onward. Roughly half the pressure rise typically occurs in the diffuser rather than in the impeller itself.

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