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Aircraft Design Practice Test: Airfoil and Geometry Selection
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Avg score: 25% • Most missed: “Determine the corrections or otherwise of the following assertion [A] and reason…”

This quiz covers: Airfoil selection, wing geometry, tail geometry and arrangement.

The shape of the airfoil is defined using the following geometrical parameters: The mean camber line or mean line is the locus of points midway between the upper and lower surfaces. Its shape depends on the thickness distribution along the chord; The thickness of an airfoil varies along the chord.

Aircraft Design Practice Test: Airfoil and Geometry Selection
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25 Questions

1. An airfoil is operated with flow velocity such that the pressure on upper and lower surface are 30 Pa and 15 Pa respectively. If chord is 1m then, what will be the lift produced by this airfoil?
2. Pitching moment co-efficient for an airfoil is given by _____
3. We are using the airfoil in the aircraft as _____
4. An aerofoil is operating with flow velocity of 100m/s. Aerofoil is symmetric and is at 0° AOA. Determine lift produced by this aerofoil.
5. Which tail profile is shown in below diagram?
Horizontal stabilizer is away from wing wake in T-tail configuration."
6. Which control surface is primarily used for spin recovery?
7. Which of the following is correct?
8. The straight line joining L.E. and T.E. of an airfoil is _______
9. If taper ratio is T and span is b with surface area as S then the root chord is _____
10. A typical wing has aspect ratio of 7 and span of 2m. If taper ratio T = 0.2 then, find the value of root chord.
11. Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Most of the wings are using cambered airfoils.
Reason[R]: Cambered airfoils can produce positive lift at 0° AOA.
12. Wing planform is affected by _____
13. What do you mean by double cambered airfoil?
14. The ratio of tip and root chord is called ____
15. Let’s consider we need to design supersonic aircraft then, which type of airfoil should be adopted?
16. Which of the following is not an application of an airfoil?
17. Pressure on the upper surface is _________
18. Camber represents the curvature of an airfoil.
19. An airfoil with symmetric profile has pitching moment about aerodynamic centre as 13 Nm at 4° AOA. Determine Pitching moment at same point if AOA is increased by 8°.
20. Typically tail provides ______
21. Elevator provides control for ______
22. If a sailplane is to be designed then, the aspect ratio of the sailplane will be ______
23. Glider with span of 2m is flying at 10000ft. If aspect ratio of tail is 10 then, determine reference area of the tail.
24. A jet fighter is operating at Mach number of 1.4. Wing chord is 1m then, find the location of aerodynamic centre.
25. What is the use of V type tail?

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