6. For a wing of aspect ratio AR, having an elliptical lift distribution, the induced drag coefficient is (where CL is the lift coefficient) CL (a) TAR (b) TAR C (c) 21AR (d) TAR2 7. Can the lift and drag of an airfoil depend upon the angle of attack? (b) False (a) True 8. The critical Mach number for a thick airfoil will be (b) greater than a thin airfoil. (d) cannot be related to thin airfoil. (a) lesser than a thin airfoil. (c) equal to a thin airfoil. 9. How do you define the lift coefficient? (a) Ratio of aerodynamic lift to the dynamic lift. (c) Wing lift to weight of aircraft. (b) Lift to drag. (d) Thrust to weight. 10. Laminar flow airfoil is used to reduce the (a) pressure drag (c) skin friction drag (b) induced drag (d) wave drag

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