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A modern axial compressor achieves a high overall pressure ratio by

  • A.Using one stage of very high ratio
  • B.Increasing the axial velocity through the machine
  • C.Raising the air temperature before the first stage
  • D.Using many stages in series, each contributing a modest ratio

Answer: D

Stage pressure ratios of about 1.2 to 1.4 multiply through ten or more stages to give overall ratios above forty in the largest engines. Multiplying rather than adding is what makes a long compressor so effective despite each stage's modest contribution.

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