Tidligere eksamen

Question 1

When considering the ICAO International Standard Atmosphere, which of the
following statements is correct?
1 - The temperature lapse rate is assumed to be uniform at 2°C per 1000 ft (1.98°C)
up to a height of 11000 ft.
2 - Sea level temperature is assumed to be 15°C.
3 - Sea level static pressure is assumed to be 1.225 kg/m3
4 - Sea level density is assumed to be 1013.25 hPa.

Answer 1

2 Only (note til nr1 den eneste forskel fra bogen og svar 1 er at der i bogen står at højden går fra MSL)

Question 2

Dynamic pressure is equal to:

Answer 2

Half the density times the indicated airspeed squared.

Question 3

What effect does landing at high altitude airports have on ground speed with comparable conditions relative to temperature, wind and aeroplane weight?

Answer 3

Higher than at low altitude.

Question 4

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

Answer 4

four times greater.

Question 5

To avoid the wing tip vortices of a departing jet aeroplane during take-off, the pilot should:

Answer 5

climb above and stay upwind of the jet aeroplane’s flight path. (note: randhvivler falder med ca.500’/min og spreder sig til siden med ca. 5kt)

Question 6

A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have:

Answer 6

A lower stall speed.

Question 7

Which aircraft has the highest aspect ratio?

Answer 7

2

Question 8

Air density is:

Answer 8

mass per unit volume. (kg/m3)

Question 9

A moving mass of air possesses kinetic energy. An object placed in the path of
such a moving mass of air will be subject to what?

Answer 9

Static pressure and dynamic pressure.

Question 10

The definition of lift is:

Answer 10

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

Question 11

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

Answer 11

centre of pressure.

Question 12

Why does increasing speed also increase lift?

Answer 12

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 13

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 13

mean camber line.

Question 14

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

Answer 14

lift, airspeed, and drag.

Question 15

What effect would a light crosswind have on the wing tip vortices generated by a large aeroplane that has just taken off?

Answer 15

The upwind vortex will tend to remain on the runway longer than the
downwind vortex.

Question 16

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

Answer 16

Heavy, slow, gear and flaps up.

Question 17

Determine the correct aspect ratio and wing area:

Answer 17

aircraft B has an aspect ratio of 13.7, and has a smaller wing area than aircraft A.

Question 18

In theory, if the airspeed of an aeroplane is doubled while in level flight, parasite drag will become:

Answer 18

four times greater.

Question 19

At a given True Airspeed, what effect will increased air density have on the lift and drag of an aircraft?

Answer 19

Lift and drag will increase.

Question 20

Which aircraft has the lowest aspect ratio?

Answer 20

1.

Question 21

What happens to total drag when accelerating from C_LMAX to maximum speed?

Answer 21

Decreases then increases.

Question 22

At the airspeed represented by point B, in steady flight, the aeroplane will:

Answer 22

have its maximum L/D ratio

Question 23

An aircraft has a L/D ratio of 15:1 at 50 kt in calm air. What would the L/D ratio be with a direct headwind of 25 kt?

Answer 23

15 : 1

Question 24

If the same angle of attack is maintained in ground effect as when out of ground effect, lift will:

Answer 24

increase, and induced drag will decrease.

Question 25

At a given Indicated Airspeed, what effect will an increase in air density have on lift and drag?

Answer 25

Lift and drag will remain the same.

Question 26

Why do the lower layers contain the greater proportion of the whole mass of the atmosphere?

Answer 26

Because air is compressible.

Question 27

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

Answer 27

flight path.

Question 28

A static pressure vent must be positioned:

Answer 28

on a part of the structure where the airflow is undisturbed, in a surface
parallel to the airflow direction.

Question 29

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

Answer 29

attack

Question 30

Wing tip vortices created by large aircraft tend to:

Answer 30

sink below the aircraft generating the turbulence.

Question 31

Lift on a wing is most properly defined as the:

Answer 31

force acting perpendicular to the relative wind.

Question 32

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

Answer 32

Increase angle of attack to maintain the correct lift force.

Question 33

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

Answer 33

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

Question 34

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

Answer 34

The angle of incidence.

Question 35

Which statement is true, regarding the opposing forces acting on an aeroplane in steady-state level flight?

Answer 35

b. These forces are equal.

Question 36

An aeroplane leaving ground effect will:

Answer 36

experience an increase in induced drag and require more thrust.

Question 37

In theory, if the angle of attack and other factors remain constant and the airspeed is doubled, the lift produced at the higher speed will be:

Answer 37

four times greater than at the lower speed.

Question 38

A symmetrical aerofoil section at CL
= 0 will produce?

Answer 38

Zero pitching moment.

Question 39

When considering the properties of a laminar and turbulent boundary layer, which of the following statements is correct?

Answer 39

Friction drag higher in turbulent.

Question 40

When compared to a laminar boundary layer:

Answer 40

a turbulent boundary layer has more kinetic energy.