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Total air temperature exceeds static air temperature because of __________.

  • A.position error
  • B.instrument lag
  • C.the lapse rate
  • D.ram rise

Answer: D

Bringing the air to rest at the probe compresses it adiabatically and raises the sensed temperature. The rise goes with the square of Mach number, so it is trivial in the circuit and substantial in high subsonic cruise.

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