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Corrected speed is physical speed divided by

  • A.The square of the temperature ratio
  • B.The ambient density ratio
  • C.The square root of the inlet temperature ratio
  • D.The inlet pressure ratio

Answer: C

The relation follows from the way blade Mach numbers depend on temperature. Cold air gives a higher corrected speed for the same physical speed, which is why an engine behaves differently on a cold day at the same shaft rpm.

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