Discussion
Assertion (A): Boundary-layer suction is widely used on production transport aircraft.
Reason (R): Suction removes the low-momentum fluid and leaves a fuller velocity profile.
Select the correct answer from the options below.
Answer: D
The assertion is false and the reason is true. Suction works well aerodynamically, but the ducting, pumping power, weight and the risk of the porous surface clogging have kept it out of routine service. It remains a research and special-purpose technique.
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