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We are using the airfoil in the aircraft as _____

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We are using the airfoil in the aircraft as _____

(a) it is a streamline shape which provides better aerodynamics

(b) it is a random shape can be changed to rectangular as well

(c) it is easy to make than rectangular

(d) it is not a streamline body

I have been asked this question in an interview for internship.

This question is from Airfoil Selection-1 in section Airfoil and Geometry Selection of Aircraft Design

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Best answer
Right choice is (a) it is a streamline shape which provides better aerodynamics

Best explanation: Airfoil is a streamlined body which provides much smoother flow than non-streamlined body. Airfoil is designed in such a way that it can provide better aerodynamics than any other shape. Hence, in aircraft we use airfoils.

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