PPL Aerodynamic Basics

During a spin to the left, which wing(s) is/are stalled?

• Both wings are stalled.

• Neither wing is stalled.

• Only the left wing is stalled.

What is ground effect?

• The result of the interference of the surface of the Earth with the airflow patterns about an airplane.

• The result of an alteration in airflow patterns increasing induced drag about the wings of an airplane.

• The result of the disruption of the airflow patterns about the wings of an airplane to the point where the wings will no longer support the airplane in flight.

Loading an airplane to the most aft CG will cause the airplane to be

• less stable at all speeds.

• less stable at slow speeds, but more stable at high speeds.

• less stable at high speeds, but more stable at low speeds.

In what flight condition must an aircraft be placed in order to spin?

• Partially stalled with one wing low.

• In a steep diving spiral.

• Stalled.

When taking off or landing at an airport where heavy aircraft are operating, one should be particularly alert to the hazards of wingtip vortices because this turbulence tends to

• rise from a crossing runway into the takeoff or landing path.

• rise into the traffic pattern area surrounding the airport.

• sink into the flightpath of aircraft operating below the aircraft generating the turbulence.

One of the main functions of flaps during approach and landing is to

• decrease the angle of descent without increasing the airspeed.

• permit a touchdown at a higher indicated airspeed.

• increase the angle of descent without increasing the airspeed.

Wingtip vortices created by large aircraft tend to

• sink below the aircraft generating turbulence.

• rise into the traffic pattern.

• rise into the takeoff or landing path of a crossing runway.

The angle of attack at which an airplane wing stalls will

• increase if the CG is moved forward.

• change with an increase in gross weight.

• remain the same regardless of gross weight.

Which statement relates to Bernoulli`s principle?

• For every action there is an equal and opposite reaction.

• An additional upward force is generated as the lower surface of the airfoil deflects air downward.

• Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.

The angle between the chord line of an airfoil and the relative wind is known as the angle of

• lift.

• attack.

• incidence.