BAvn Bachelor of Aviation Bachelor of Aviation Theory of Flight 4

Question 1

What is 'aeroelastic divergence' and under what condition does it typically occur?

Accepted Answer

Aileron reversal caused by wing twist exceeding aerodynamic restoring moments at high dynamic pressure

Answer

Divergence occurs when aerodynamic twisting moments exceed the wing's structural torsional stiffness, causing progressive uncontrolled twisting, typically at high dynamic pressure.

Question 2

How does ground effect influence an aircraft's induced drag during landing?

Accepted Answer

Ground effect reduces induced drag by disrupting wingtip vortex formation near the surface

Answer

Proximity to the ground inhibits the downward development of wingtip vortices, reducing induced drag and causing the aircraft to 'float' during flare.

Question 3

What is the relationship between angle of attack and the coefficient of lift (CL) for a conventional airfoil below the stall?

Accepted Answer

CL increases approximately linearly with increasing angle of attack

Answer

Below the stall, CL increases approximately linearly with angle of attack at a rate of about 0.1 per degree for thin airfoils in subsonic flow.

Question 4

Which of the following correctly describes 'propeller torque effect' and its primary correction?

Accepted Answer

Reaction torque causes the aircraft to roll opposite to propeller rotation; corrected by aileron trim

Answer

Newton's third law means a clockwise-rotating propeller (viewed from behind) produces a counterclockwise rolling tendency in the airframe, corrected by aileron trim.

Question 5

What is the primary aerodynamic purpose of leading-edge slats on a high-lift system?

Accepted Answer

Allow the wing to operate at a higher angle of attack before stalling by re-energizing boundary layer flow

Answer

Slats extend forward and down, allowing high-energy air to flow through the slot and re-energize the boundary layer, delaying separation to a higher angle of attack.

BAvn Bachelor of Aviation Practice Test

BAvn Bachelor of Aviation Practice Test

BAvn Bachelor of Aviation Bachelor of Aviation Theory of Flight 4