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All of the following increase across a normal shock EXCEPT

  • A.The static temperature
  • B.The entropy
  • C.The Mach number
  • D.The static pressure

Answer: C

The Mach number always falls across a normal shock, and indeed falls below one. Pressure, temperature, density and entropy all rise. The velocity falls as well, so any option suggesting the flow speeds up through a shock can be discarded immediately.

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