Discussion
Assertion (A): A supercritical aerofoil eliminates supersonic flow over its upper surface.
Reason (R): A supercritical section has a relatively flat upper surface.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true. The flat crest does not prevent the supersonic pocket; it keeps the local Mach number modest over a long run so the shock that closes the pocket is weak. The section manages supersonic flow rather than avoiding it.
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