Discussion
Which of these does NOT follow from the fact that only the normal component is processed by an oblique shock?
Answer: C
Correct answer: The stagnation temperature falls across an oblique shock
Stagnation temperature is constant across any shock, oblique or normal, because a shock is adiabatic and does no work - the energy equation gives it directly. What falls is the stagnation *pressure*, since the process is irreversible. The other three do follow from the decomposition: the normal shock relations apply to the normal component, that component determines the loss and is smaller than the full Mach number, and the tangential component passes through unchanged so the downstream flow may still be supersonic.
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