AQT AQT Aerodynamics & Flight Principles 1 — Questions and Answers
Question 1: Which of the four forces of flight acts opposite to the direction of motion?
- Lift
- Thrust
- Drag (Correct answer)
- Weight
Correct answer: Drag
Drag is the aerodynamic force that opposes an aircraft's forward motion through the air.
Question 2: What is the term for the angle between the chord line of a wing and the relative wind?
- Dihedral angle
- Angle of attack (Correct answer)
- Angle of incidence
- Sweep angle
Correct answer: Angle of attack
The angle of attack is the angle between the wing's chord line and the relative wind, directly affecting lift production.
Question 3: At what angle of attack does a wing typically stall?
- 5–8 degrees
- 10–15 degrees
- 18–22 degrees (Correct answer)
- 25–30 degrees
Correct answer: 18–22 degrees
Most wings stall at approximately 18–22 degrees angle of attack when airflow over the upper surface separates.
Question 4: According to Bernoulli's principle, what happens to air pressure as velocity increases?
- Pressure increases
- Pressure decreases (Correct answer)
- Pressure stays the same
- Pressure oscillates
Correct answer: Pressure decreases
Bernoulli's principle states that as the velocity of a fluid increases, its pressure decreases, which helps generate lift over a wing.
Question 5: What type of drag is caused by the production of lift?
- Parasite drag
- Skin friction drag
- Induced drag (Correct answer)
- Form drag
Correct answer: Induced drag
Induced drag is a byproduct of lift generation, caused by wingtip vortices that redirect airflow and produce rearward force.
Question 6: Which wing design feature reduces induced drag by limiting wingtip vortices?
- Flaps
- Slats
- Winglets (Correct answer)
- Ailerons
Correct answer: Winglets
Winglets are vertical extensions at wingtips that reduce the strength of wingtip vortices, thereby decreasing induced drag.
AQT AQT Aerodynamics & Flight Principles 1
Which of the four forces of flight acts opposite to the direction of motion?