Discussion
Assertion (A): An oblique shock at a given upstream Mach number destroys less stagnation pressure than a normal shock does.
Reason (R): Only the velocity component normal to an oblique shock is processed by it.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason for the first. The effective Mach number governing the shock is the normal component, which is smaller than the full Mach number, so the shock is weaker and the entropy rise correspondingly less. Intake designers exploit exactly this.
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