30 Questions
Which of the following is an example of parasite drag?
Profile drag
How does induced drag change with airspeed?
Induced drag decreases proportionally to the square of airspeed
What causes induced drag?
Spanwise movement of air from the bottom of the wing outward
What is the purpose of winglets on modern aircraft?
To reduce induced drag
What is the relationship between induced drag and airspeed?
Induced Drag decreases with the square of the airspeed
Which forces act on an aircraft in flight?
Lift, weight, thrust, and drag
What is the efficiency factor for total aircraft propulsion?
Thrust to weight ratio
What is the equation for thrust to weight ratio?
$\frac{Thrust}{Weight} = \frac{ma}{mg}$
Which of the following is true about the angle of attack (AoA)?
All of the above are true about the angle of attack (AoA).
What is the purpose of changing the angle of attack (AoA) of the aerofoil?
To increase the camber of the upper surface in relation to the airflow.
What happens to lift as the angle of attack (AoA) increases beyond the stalling angle?
Lift decreases rapidly.
Which of the following is true about the stall condition in an aircraft?
The stall condition occurs when the dynamic pressure is constant.
Where does the stall occur on the wing?
The stall occurs on the upper surface of the wing.
What is the purpose of a stick shaker in heavy aircraft?
To simulate the effect of turbulent airflow over the elevators.
What is the purpose of a stall strip on an aircraft wing?
To prevent flow separation at the wing tip.
What happens to the aircraft during a wing root stall?
The aircraft rotates to the nose down position.
Which of the following is a dimensionless coefficient that varies with surface finish, fineness ratios, etc.?
CD
What is the portion of the resistance that is due to the formation of eddies and turbulence when air flows past an aircraft?
Form Drag
What is the relationship between the length and thickness of a streamlined body for least resistance?
The length should be between three and four times greater than the maximum thickness
Which of the following variables does the lift and drag forces depend on?
Air density
What is the formula for lift force?
$L = \ 1/2 \cdot \rho \cdot v^2 \cdot S \cdot CL$
What is the simplest and most basic formula for Drag Profile?
$Dp = \rho \cdot S $
What happens to the lift produced by an aerofoil beyond 16° angle of attack?
The lift decreases
What is the primary cause of the aerodynamic resultant and hence drag?
Change in dynamic pressure
What causes the decrease in angle of attack (AoA) during a stall recovery?
Increased airspeed
How is the wing twisted to cause 'Wash Out'?
Aerodynamically & Geometrically
Which of the following is the most severe and dangerous form of ice formation on an aircraft?
Glaze ice
What is the main danger of glaze ice formation on an aircraft?
All of the above
What is the effect of ice, snow, rime formation, or other deteriorations on the leading edge and upper surface of the wing?
All of the above
Where is the first 20% of the wing chord particularly sensitive to disturbances of air flow?
Leading edge
Test your knowledge of basic aerodynamics with this quiz. Topics include aerofoil AoA lift to stall transition, CoP movement along an aerofoil chord line, and more. Perfect for aviation enthusiasts and students.
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