Basic Aerodynamics

Question 1

The acute angle A is the angle of:

A-incidence

B-attack

C-dihedral

Answer 1

B-attack

Question 2

The term “angle of attack” is defined as the angle:

A-between the wing chord line and the relative wind.

B-between the airplane’s climb angle and the horizon

C-formed by the longitudinal axis of the airplane and the chord line of the wing.

Answer 2

A-between the wing chord line and the relative wind

Question 3

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

A-lift

B-attack

C-incidence

Answer 3

B-attack

Question 4

The term angle of attack is defined as the angle between the:

A-chord line of the wing and the relative wind.

B-airplane’s longitudinal axis and that of the air striking the airfoil.

C-airplane’s center line and the relative wind.

Answer 4

A-chord line of the wing and the relative wind.

Question 5

Which statement relates to Bernoulli’s principle?

A-for every action there is an equal and opposite reaction.

B-an additional upward force is generated as the lower surface of the airfoil deflects air downward.

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

Answer 5

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

Question 6

The four forces acting on an airplane in flight are:

A-lift, weight, thrust, and drag.

B-lift, weight, gravity, and thrust.

C-lift, gravity, power, and friction.

Answer 6

A-lift, weight, thrust, and drag.

Question 7

Select the four flight fundamentals involved in maneuvering an aircraft.

A-aircraft power, pitch, bank, and trim.

B-starting, taxiing, takeoff, and landing.

C-straight-and-level flight, turns, climbs, and descents.

Answer 7

C-straight-and-level flight, turns, climbs, and descents.

Question 8

In flying the rectangular course, when would the aircraft be turned less than 90 degrees?

A-corners 1 and 4

B-corners 1 and 2

C-corners 2 and 4

Answer 8

A-corners 1 and 4

Question 9

While practicing S-turns, a consistently smaller half-circle is made on one side of the road than the other, and this turn is not completed before crossing the road or reference line. This would mostly likely occur in:

A-1, 2, 3 because the bank is decreased too rapidly during the latter part of the turn.

B-4,5,6 because the bank is increased too rapidly during the early part of the turn.

C-4,5,6 because the bank is increased too slowly during the later part of the turn.

Answer 9

B-4,5,6 because the bank is increased too rapidly during the early part of the turn.

Question 10

Ground effect is most likely to result in which problem?

A-settling to the surface abruptly during landing.

B-becoming airborne before reaching recommended takeoff speed.

C-inability to get airborne even though airspeed is sufficient for normal takeoff needs.

Answer 10

B-becoming airborne before reaching recommended takeoff speed.

Question 11

What is ground effect?

A-the result of the interference of the surface of the earth with the airflow patterns about an airplane.

B-the result of an alteration in airflow patterns increasing induced drag about the wings of an airplane.

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

Answer 11

A-the result of the interference of the surface of the earth with the airflow patterns about an airplane.

Question 12

Floating caused by the phenomenon of ground effect will most be realized during an approach to land when at:

A-less than the length of the wingspan above the surface.

B-twice the length of the wingspan above the surface.

C-a higher-than-normal angle of attack.

Answer 12

A-less than the length of the wingspan above the surface.

Question 13

What must a pilot be aware of as a result of ground effect?

A-wingtip vortices increase creating wake turbulence problems for arriving and departing aircraft.

B-induced drag decreases; therefore any excess speed a the point of flare may cause considerable floating.

C-a full stall landing will require less up elevator deflection than would a full stall when done free of ground effect.

Answer 13

B-induced drag decreases; therefore any excess speed a the point of flare may cause considerable floating.

Question 14

Which is a result of the phenomenon of ground effect?

A-the induced angle of attack of each rotor blade is increased.

B-the lift vector becomes more horizontal.

C-the angle of attack generating lift is increased.

Answer 14

C-the angle of attack generating lift is increased.

Question 15

The airspeed range to avoid while flying in ground effect is:

A-25-40mph

B-25-57mph

C-40mph and above.

Answer 15

C-40mph and above.

Question 16

When landing behind a large aircraft, which procedure should her followed for vortex avoidance?

A-stay above its final approach flightpath all the way to touchdown.

B-stay below and to one side of its final approach flightpath.

c-stay well below its final approach flightpath and land at least 2,000 feet behind.

Answer 16

A-stay above its final approach flightpath all the way to touchdown.

Question 17

How does the wake turbulence vortex circulate around each wingtip?

A-inward, upward, and around each tip.

B-inward, upward, and counterclockwise.

C-outward, upwards, and around each tip.

Answer 17

C-outward, upwards, and around each tip.

Question 18

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:

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

B-rise into the traffic pattern area surrounding the airport.

C-sink into the flightpath of aircraft operating below the aircraft generating the turbulence.

Answer 18

C-sink into the flightpath of aircraft operating below the aircraft generating the turbulence.

Question 19

Wingtip vortices are created only when an aircraft is:

A-operating at hight airspeeds

B-heavily loaded.

C-developing lift.

Answer 19

C-developing lift.

Question 20

The greatest vortex strength occurs when the generating aircraft is:

A-light, dirty, and fast.

B-heavy, dirty, and fast.

C-heavy, clean, and slow.

Answer 20

C-heavy, clean, and slow

Question 21

Wingtip vortices created by large aircraft tend to:

A-sink below the aircraft generating turbulence.

B-rise into the traffic pattern.

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

Answer 21

A-sink below the aircraft generating turbulence.

Question 22

The wind condition that requires maximum caution when avoiding wake turbulence on landing is a:

A-light, quartering headwind.

B-light, quartering tailwind.

C-strong headwind.

Answer 22

B-light, quartering tailwind.

Question 23

When landing behind a large aircraft, the pilot should avoid wake turbulence by staying:

A-above the large aircraft’s final approach path and landing beyond the large aircraft’s touchdown point.

B-below the large aircraft’s final approach path and landing before the large aircraft’s touchdown point.

C-above the large aircraft’s final approach path and landing before the large aircraft’s touchdown point.

Answer 23

A-above the large aircraft’s final approach path and landing beyond the large aircraft’s touchdown point.

Question 24

When departing behind a heavy aircraft, the pilot should avoid wake turbulence by maneuvering the aircraft:

A-below and downwind from the heavy aircraft.

B-above and upwind from the heavy aircraft.

C-below and upwind from the heavy aircraft.

Answer 24

B-above and upwind from the heavy aircraft.