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Engine pressure ratio on a turbofan is the ratio of

  • A.Compressor discharge to inlet pressure
  • B.Combustion chamber to ambient pressure
  • C.Exhaust to fuel supply pressure
  • D.Turbine discharge pressure to compressor inlet pressure

Answer: D

It correlates closely with thrust, which cannot be measured directly in flight, so it serves as the thrust setting parameter on many engines. Blockage or icing of either pressure probe corrupts the ratio and therefore the thrust actually set.

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