Discussion
A normal shock reduces the stagnation pressure of a stream by \( 28 \) per cent. The stagnation temperature ratio across it is
Answer: B
A shock is adiabatic, so the stagnation temperature is unchanged whatever happens to the stagnation pressure, and the ratio is exactly one. The 28 per cent loss reflects the entropy rise alone. Confusing the two stagnation quantities is among the most common errors in compressible flow.
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