Lift

Question 1

To maintain altitude, what must be done as Indicated Airspeed (IAS) is reduced?

Answer 1

Increase angle of attack to maintain the correct lift force.

Question 2

If more lift force is required because of greater operating weight, what must be
done to fly at the angle of attack which corresponds to C_LMAX (STALL)

Answer 2

Increase the Indicated Airspeed (IAS).

Question 3

To generate a constant lift force, any adjustment in ___ must be
accompanied by a change in ___

Answer 3

To generate a constant lift force, any adjustment in IAS must be
accompanied by a change in angle of attack.

Question 4

The greater the operating weight, the higher the minimum ___

Answer 4

The greater the operating weight, the higher the minimum IAS

Question 5

What flight condition should be expected when an aircraft leaves ground effect?

Answer 5

An increase in induced drag and a requirement for a higher angle of attack.

Question 6

If the angle of attack and other factors remain constant and airspeed is doubled,
lift will be:

Answer 6

four times greater. (L=1/2pV^2C_L*S

Question 7

The angle between the _______ and the ____ is called the
aerodynamic incidence or angle of attack.

Answer 7

The angle between the CHORD LINE and the RELATIVE AIRFLOW is called the
aerodynamic incidence or angle of attack.

Question 8

The definition of lift is:

Answer 8

the aerodynamic force which acts at 90° to the relative airflow.

Question 8

An aerofoil section is designed to produce lift resulting from a difference in the:

Answer 8

higher air pressure below the surface and lower air pressure above the
surface.

Question 9

On an aerofoil section, the force of lift acts perpendicular to, and the force of drag
acts parallel to the:

Answer 9

flight path.

Question 10

When the angle of attack of a symmetrical aerofoil is increased, the centre of
pressure will:

Answer 10

remain unaffected.

Question 11

Why does increasing speed also increase lift?

Answer 11

The increased speed of the air passing over an aerofoil’s upper surface
DECREASES THE STATIC PRESSURE, thus creating a GREATER pressure differential
between the upper and lower surface.

Question 12

The point on an aerofoil section through which lift acts is the:

Answer 12

centre of pressure.

Question 13

The angle between the chord line of the aerofoil section and the longitudinal axis
of the aircraft is known as:

Answer 13

the angle of incidence.

Question 14

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

Answer 14

attack.

Question 15

A line drawn from the leading edge to the trailing edge of an aerofoil section and
equidistant at all points from the upper and lower contours is called the:

Answer 15

mean camber line.

Question 16

At zero angle of attack, the pressure along the upper surface of a symmetrical
aerofoil section would be:

Answer 16

less than atmospheric pressure.

Question 17

The angle of attack of an aerofoil section directly controls:

Answer 17

the distribution of positive and negative pressure acting on the section.

Question 18

When the angle of attack of a positively cambered aerofoil is increased, the centre
of pressure will:

Answer 18

move forward along the chord line.

Question 19

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

Answer 19

between the section chord line and the relative wind.

Question 20

How does the wake turbulence vortex circulate around each wing tip, when
viewed from the rear?

Answer 20

Outward, upward, and around the wing tip.

Question 21

How can you alter the wake turbulence produced by a large transport aircraft?

Answer 21

The vortex characteristics of any given aircraft may be altered by extending
the flaps or changing the speed.

Question 22

Wing tip vortices created by large aircraft tend to:

Answer 22

sink below the aircraft generating the turbulence.

Question 23

Hazardous vortex turbulence that might be encountered behind large aircraft is
created only when that aircraft is:

Answer 23

developing lift

Question 24

Which flight conditions of a large jet aeroplane create the most severe flight hazard by generating wing tip vortices of the greatest strength?

Answer 24

Heavy, slow, gear and flaps up.

Question 25

By changing the angle of attack of a wing, the pilot can control the aeroplane’s:

Answer 25

lift, airspeed, and drag.

Question 26

How can an aeroplane produce the same lift in ground effect as when out of ground effect?

Answer 26

A lower angle of attack.

Question 27

What true airspeed and angle of attack should be used to generate the same
amount of lift as altitude is increased?

Answer 27

A higher true airspeed for any given angle of attack.