A: allow an increased mechanical load.
B: avoid the appearance of sonic phenomena.
C: reduce the blade tangential velocity from root to tip.
D: maintain a constant angle of attack along the blade.
Answer: D
Tag Archives: angle of attack
The critical angle of attack:
A: decreases if the CG is moved aft.
B: increases if the CG is moved forward.
C: remains unchanged regardless of gross weight.
D: changes with an increase in gross weight.
Answer: C
If an aeroplane is at a higher mass than anticipated, for a given airspeed the angle of attack will
A: be greater, drag will increase and endurance will decrease.
B: be decreased, drag will decrease and endurance will increase.
C: remain constant, drag will decrease and endurance will decrease.
D: remain constant, drag will increase and endurance will increase.
Answer: A
For a fixed-pitch propeller designed for cruise, the angle of attack of each blade, measured at the reference section:
A: is always positive during idling descent.
B: decreases when the aircraft speed decreases (with constant engine RPM).
C: is lower in ground run than in flight (with constant engine RPM).
D: is optimum when the aircraft is in a stabilized cruising flight.
Answer: D
The angle of attack of a aerofoil section is defined as the angle between:
A: The undisturbed airflow and the chordline.
B: The local airflow and the mean camberline.
C: The local airflow and the chordline.
D: The undisturbed airflow and the mean camberline.
Answer: A
A slat will
A: provide a boundary layer suction on the upper surface of the wing.
B: increase the camber of the aerofoil and divert the flow around the sharp leading edge.
C: increase the lift by increasing the wing area and the camber of the aft portion of the wing.
D: prolongs the stall to a higher angle of attack.
Answer: D