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For the same normal shock at \( M_1 = 2 \), the stagnation temperature ratio is

  • A.1.000
  • B.0.721
  • C.1.688
  • D.1.200

Answer: A

A shock is adiabatic, so the stagnation temperature is identical on both sides and the ratio is exactly one, whatever happens to pressure. Confusing this with the stagnation pressure ratio of 0.721 is among the commonest errors in the subject, so the two are worth quoting together.

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