16 Questions
What determines the magnitude of the lift and drag forces of a wing cross-section?
The pressure distribution around the wing
At what angles of attack are the lift and drag forces of a wing cross-section normal to each other?
They are never normal to each other
What happens to the pitching moment when trailing-edge flaps are deployed in level flight?
Nose-up
How does the induced drag and wing-tip vortices change with increasing angles of attack?
The wing-tip vortices and induced drag increase
Which factor results in the induced angle of attack?
Downwash due to wing-tip vortices
What effect do vortex generators have on wing-tip vortices?
Diminish wing-tip vortices
At a constant IAS and mass in level flight during flap selection, what happens?
Both Cl and Cd increase
What causes pitch up at low speed?
Spanwise flow on a swept-back wing
Regarding the boundary layer, which of the following statements is correct?
The turbulent boundary layer generates less skin friction than the laminar boundary layer
Which of the following statements is correct?
The stagnation point moves downward on a wing profile as the angle of attack increases
The most important advantage of the turbulent boundary layer over the laminar boundary layer is:
It reduces skin friction
For a positively cambered aerofoil when Cl is zero, what happens to the pitch moment?
Negative (pitch-down)
What does Winglets improve in an aeroplane's performance?
Decrease the induced drag
The direction of spanwise flow is from:
The top of the wing to beneath the wing via the leading edge
The CP of a positive cambered wing at an increasing angle of attack will:
Move aft
What happens aft of the transition point between laminar and turbulent flow?
The mean speed increases and the surface friction increases
Test your understanding of aerodynamics concepts with this self-assessment exercise. Explore lift and drag forces, trailing-edge flaps, and pitching moments in level flight as you answer these multiple-choice questions.
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