SPC Basic Aerodynamics Principles 2

Question 1

What is the primary cause of induced drag on a wing?

Accepted Answer

Wingtip vortices created by pressure differential between upper and lower surfaces

Answer

Skin friction from airflow over the surface

Answer

Turbulent boundary layer separation at the trailing edge

Answer

Interference between the wing and fuselage

Question 2

As angle of attack increases beyond the critical angle, what happens to lift?

Accepted Answer

Lift decreases rapidly as the wing stalls

Answer

Lift increases sharply

Answer

Lift remains constant

Answer

Lift decreases gradually over several degrees

Question 3

Which aerodynamic force acts perpendicular to the relative wind?

Accepted Answer

Lift

Answer

Drag

Answer

Thrust

Answer

Weight

Question 4

What effect does increasing airspeed have on parasite drag?

Accepted Answer

Parasite drag increases with the square of airspeed

Answer

Parasite drag decreases proportionally

Answer

Parasite drag remains constant

Answer

Parasite drag increases linearly with airspeed

Question 5

In steady, level, unaccelerated flight, which statement about the four forces is correct?

Accepted Answer

Lift equals weight and thrust equals drag

Answer

Thrust exceeds drag and lift exceeds weight

Answer

Thrust equals weight and lift equals drag

Answer

All four forces are equal to zero

Question 6

What is the relationship between air density and lift production at a constant angle of attack and airspeed?

Accepted Answer

Higher air density produces more lift

Answer

Lower air density produces more lift

Answer

Air density has no effect on lift

Answer

Lift is inversely proportional to the square of density

Question 7

Which statement correctly describes the camber of an airfoil?

Accepted Answer

The curvature of the mean camber line from chord line

Answer

The straight-line distance from leading edge to trailing edge

Answer

The thickness of the airfoil at its widest point

Answer

The angle between the chord line and relative wind