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Select the incorrect statement for a flow over wings.

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Select the incorrect statement for a flow over wings.

(a) Induced drag comes from pressure- drag

(b) Pressure imbalance makes D’Alembert’s paradox does not occur

(c) 3D flow over wings cause induced drag

(d) Induced drag is a ‘type’ of pressure- drag

I got this question in an interview for job.

My query is from Downwash and Induced Drag topic in division Flow over Airfoils over Finite Wing of Aerodynamics

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The correct option is (a) Induced drag comes from pressure- drag

Explanation: For a wing, 3D flow causes a pressure imbalance in the direction of free – stream velocity, which is the drag. Thus, induced drag is a type of pressure-drag. But it is not caused by pressure drag.

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