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The critical pressure ratio for a nozzle handling hot exhaust gas is approximately

  • A.1.85
  • B.1.0
  • C.3.5
  • D.0.53

Answer: A

For a specific heat ratio near 1.33 the ratio of total to static pressure at sonic conditions is about 1.85. The reciprocal, near 0.53, is the same condition expressed as the static pressure fraction, which is why both numbers appear in textbooks.

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