Discussion
Assertion (A): Stagnation pressure falls across an oblique shock.
Reason (R): An oblique shock raises the entropy of the gas passing through it.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Any irreversibility destroys stagnation pressure, and a shock of finite strength is irreversible whatever its inclination. The loss is smaller than for a normal shock at the same upstream Mach number, because only the normal component is processed.
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