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Aerodynamics EASA

Beschreibung

Quiz am Aerodynamics EASA , erstellt von Ahidul Hoque am 11/02/2016.
Ahidul Hoque
Quiz von Ahidul Hoque, aktualisiert more than 1 year ago
Ahidul Hoque
Erstellt von Ahidul Hoque vor etwa 8 Jahre
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Zusammenfassung der Ressource

Frage 1

Frage
The ISA
Antworten
  • assumes a standard day.
  • is taken from the equator
  • is taken from 45 degrees latitude

Frage 2

Frage
At higher altitudes as altitude increases, pressure
Antworten
  • decreases at constant rate.
  • decreases exponentially
  • increases exponentially

Frage 3

Frage
When the pressure is half of that at sea level, what is the altitude?.
Antworten
  • 12,000 ft.
  • 18,000 ft.
  • 8,000 ft.

Frage 4

Frage
If gauge pressure on a standard day at sea level is 25 PSI, the absolute pressure is.
Antworten
  • 39.7 PSI.
  • 10.3 PSI.
  • 43.8 PSI.

Frage 5

Frage
Pressure decreases.
Antworten
  • inversely proportional to temperature.
  • proportionally with a decreases in temperature.
  • Pressure and temperature are not related.

Frage 6

Frage
As air gets colder, the service ceiling of an aircraft.
Antworten
  • reduces.
  • increases.
  • remains the same.

Frage 7

Frage
What is sea level pressure?.
Antworten
  • 1012.3 mb.
  • 1013.2 mb.
  • 1032.2 mb.

Frage 8

Frage
How does IAS at the point of stall vary with height?.
Antworten
  • It decreases.
  • It is practically constant.
  • It increases.

Frage 9

Frage
What is the lapse rate with regard to temperature?
Antworten
  • 4°C per 1000 ft.
  • 1.98°C per 1000 ft.
  • 1.98°F per 1000 ft.

Frage 10

Frage
Standard sea level temperature is.
Antworten
  • 20 degrees Celsius
  • 0 degrees Celsius.
  • 15 degrees Celsius.

Frage 11

Frage
As altitude increases, pressure.
Antworten
  • decreases exponentially
  • decreases at constant rate
  • increases exponentially

Frage 12

Frage
Lapse rate usually refers to.
Antworten
  • Density.
  • Pressure
  • Temperature

Frage 13

Frage
Temperature above 36,000 feet will.
Antworten
  • increase exponentially
  • decrease exponentially
  • remain constant

Frage 14

Frage
With increasing altitude pressure decreases and.
Antworten
  • temperature decreases at the same rate as pressure reduces.
  • temperature decreases but at a lower rate than pressure reduces
  • temperature remains constant to 8000 ft

Frage 15

Frage
What is the temperature in comparison to ISA conditions at 30,000ft?.
Antworten
  • 60°C.
  • 0°C
  • 45°C.

Frage 16

Frage
At what altitude is the tropopause?.
Antworten
  • 36,000 ft.
  • 57,000 ft.
  • 63,000 ft.

Frage 17

Frage
What approximate percentage of oxygen is in the atmosphere?.
Antworten
  • 12%.
  • 21%.
  • 78%.

Frage 18

Frage
Which has the greater density?.
Antworten
  • Air at low altitude.
  • Air at high altitude.
  • It remains constant.

Frage 19

Frage
At what altitude does stratosphere commence approximately?.
Antworten
  • Sea level.
  • 36,000 ft.
  • 63,000 ft.

Frage 20

Frage
A pressure of one atmosphere is equal to.
Antworten
  • 14.7 psi.
  • 1 inch Hg.
  • 100 millibar.

Frage 21

Frage
The millibar is a unit of.
Antworten
  • atmospheric temperature
  • pressure altitude.
  • barometric pressure.

Frage 22

Frage
With an increase in altitude under I.S.A. conditions the temperature in the troposphere.
Antworten
  • remains constant.
  • decreases.
  • increases.

Frage 23

Frage
A barometer indicates.
Antworten
  • pressure
  • density
  • temperature.

Frage 24

Frage
The amount of water vapour capacity in the air (humidity holding capacity of the air) is.
Antworten
  • greater on a colder day, and lower on a hotter day
  • doesn't have a significant difference.
  • greater on a hotter day and lower on a colder day

Frage 25

Frage
Which condition is the actual amount of water vapour in a mixture of air and water?.
Antworten
  • Relative humidity.
  • Absolute humidity
  • Dew point.

Frage 26

Frage
Which will weigh the least?.
Antworten
  • 98 parts of dry air and 2 parts of water vapour
  • 50 parts of dry air and 50 parts of water vapour
  • 35 parts of dry air and 65 parts of water vapour.

Frage 27

Frage
Which is the ratio of the water vapour actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure?.
Antworten
  • Absolute humidity
  • Dew point.
  • Relative humidity

Frage 28

Frage
The speed of sound in the atmosphere
Antworten
  • changes with a change in pressure.
  • varies according to the frequency of the sound.
  • changes with a change in temperature.

Frage 29

Frage
What is sea level pressure?.
Antworten
  • 1032.2 mb.
  • 1012.3 mb.
  • 1013.2 mb.

Frage 30

Frage
Which statement concerning heat and/or temperature is true?.
Antworten
  • Temperature is a measure of the kinetic energy of the molecules of any substance.
  • Temperature is a measure of the potential energy of the molecules of any substance.
  • There is an inverse relationship between temperature and heat.

Frage 31

Frage
What is absolute humidity?.
Antworten
  • The temperature to which humid air must be cooled at constant pressure to become saturated.
  • The actual amount of the water vapour in a mixture of air and water.
  • The ratio of the water vapour actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure.

Frage 32

Frage
The temperature to which humid air must be cooled at constantpressuretobecome saturated is called.
Antworten
  • relative humidity.
  • dew point.
  • absolute humidity.

Frage 33

Frage
Density changes with altitude at a rate.
Antworten
  • of 2kg/m3 per 1000 ft
  • which changes with altitude.
  • which is constant until 11 km.

Frage 34

Frage
Above 65,800 ft temperature.
Antworten
  • decreases by 1.98°C up to 115,000 ft.
  • remains constant up to 115,000 ft.
  • increases by 0.303°C up to 115,000 ft.

Frage 35

Frage
At sea level, ISA atmospheric pressure is.
Antworten
  • 14.7 kPa.
  • 10 Bar
  • 14.7 PSI.

Frage 36

Frage
On a very hot day with ambient temperature higher than ISA, the pressure altitude is 20,000 ft. How much will the density altitude be?.
Antworten
  • the same
  • greater than 20,000ft
  • less than 20,000ft

Frage 37

Frage
The atmospheric zone where the temperature remains fairly constant is called the.
Antworten
  • Stratosphere.
  • Ionosphere.
  • Troposphere.

Frage 38

Frage
In the ISA the height of the tropopause is
Antworten
  • 11,000 feet.
  • 11,000 metres
  • 36,000 metres

Frage 39

Frage
In the ISA the sea level pressure is taken to be.
Antworten
  • 14 PSI.
  • 1013.2 mb.
  • 1.013 mb

Frage 40

Frage
In the ISA the temperature lapse rate with altitude is taken to be :
Antworten
  • dependent on pressure and density changes.
  • linear.
  • non linear.

Frage 41

Frage
Put in sequence from the ground up
Antworten
  • tropopause, stratosphere, troposphere.
  • tropopause, troposphere, stratosphere.
  • troposphere, tropopause, stratosphere.

Frage 42

Frage
The International Standard Atmosphere can be described as.
Antworten
  • the atmosphere at 45 degrees north latitude.
  • the atmosphere at the equator with certain conditions
  • the atmosphere which can be used Worldwide to provide comparable performance results.

Frage 43

Frage
The temperature lapse rate below the tropopause is.
Antworten
  • 1°C per 1000 ft.
  • 2°C per 1000 ft.
  • 3°C per 1000 ft.

Frage 44

Frage
Above the tropopause air pressure
Antworten
  • decreases at a constant rate.
  • decreases exponentially.
  • increases exponentially

Frage 45

Frage
Which of the following is correct?.
Antworten
  • Absolute pressure + Atmospheric pressure = Gauge pressure
  • Absolute pressure = Gauge pressure + Atmospheric pressure
  • Atmospheric pressure = Absolute pressure + Gauge pressure

Frage 46

Frage
As the altitude increases what happens of the ratio of Nitrogen to Oxygen?.
Antworten
  • Increases.
  • Decreases.
  • Stays the same.

Frage 47

Frage
What happens to the density of air as altitude is increased?.
Antworten
  • Decreases.
  • Stays the same.
  • Increases.

Frage 48

Frage
An aircraft is travelling at a speed of 720 nautical miles per hour. To calculate speed in MPH you.
Antworten
  • divide by 0.83.
  • multipy by 0.83
  • multiply by 1.15.

Frage 49

Frage
Lift on a delta wing aircraft
Antworten
  • increases with an increased angle of incidence (angle of attack).
  • does not change with a change in angle of incidence (angle of attack).
  • decreases with an increase in angle of incidence (angle of attack).

Frage 50

Frage
The CofP is the point where.
Antworten
  • the lift can be said to act.
  • the three axis of rotation meet.
  • all the forces on an aircraft act

Frage 51

Frage
When an aircraft experiences induced drag.
Antworten
  • air flows under the wing span wise towards the root and on top of the wing span wise towards the tip.
  • Neither a) or b) since induced drag does not caused by span wise flow.
  • air flows under the wing span wise towards the tip and on top of the wing span wise towards the root.

Frage 52

Frage
At stall, the wingtip stagnation point.
Antworten
  • doesn’t move
  • moves toward the lower surface of the wing.
  • moves toward the upper surface of the wing.

Frage 53

Frage
The rigging angle of incidence of an elevator is.
Antworten
  • the angle between the bottom surface of the elevator and the longitudinal datum.
  • the angle between the bottom surface of the elevator and the horizontal in the rigging position.
  • the angle between the mean chord line and the horizontal in the rigging position.

Frage 54

Frage
Which of the following is true?.
Antworten
  • Lift acts at right angles to the relative airflow and weight acts vertically down.
  • Lift acts at right angles to the wing chord line and weight acts vertically down.
  • Lift acts at right angles to the relative air flow and weight acts at right angles to the aircraft centre line.

Frage 55

Frage
The vertical fin of a single engined aircraft is.
Antworten
  • parallel with the longitudinal axis but not the vertical axis.
  • parallel with both the longitudinal axis and vertical axis.
  • parallel with the vertical axis but not the longitudinal axis.

Frage 56

Frage
What happens to air flowing at the speed of sound when it enters a converging duct?.
Antworten
  • Velocity increases, pressure and density decreases.
  • Velocity, pressure and density increase.
  • Velocity decreases, pressure and density increase

Frage 57

Frage
As the angle of attack of an airfoil increases the centre of pressure.
Antworten
  • remains stationary.
  • moves aft.
  • moves forward.

Frage 58

Frage
Vapour trails from the wingtips of an aircraft in flight are caused by.
Antworten
  • low pressure above the wing and high pressure below the wing causing vortices.
  • low pressure above the wing and high pressure below the wing causing a temperature rise.
  • high pressure above the wing and low pressure below the wing causing vortices.

Frage 59

Frage
The chord line of a wing is a line that runs from.
Antworten
  • the centre of the leading edge of the wing to the trailing edge.
  • half way between the upper and lower surface of the wing.
  • one wing tip to the other wing tip.

Frage 60

Frage
The angle of incidence of a wing is an angle formed by lines.
Antworten
  • parallel to the chord line and longitudinal axis
  • parallel to the chord line and the vertical axis.
  • parallel to the chord line and the lateral axis

Frage 61

Frage
The centre of pressure of an aerofoil is located.
Antworten
  • 30 - 40% of the chord line forward of the leading edge
  • 50% of the chord line back from the leading edge.
  • 30 - 40% of the chord line back from the leading edge

Frage 62

Frage
Compressibility effect is.
Antworten
  • drag associated with the form of an aircraft.
  • the increase in total drag of an aerofoil in transonic flight due to the formation of shock waves.
  • drag associated with the friction of the air over the surface of the aircraft.

Frage 63

Frage
A high aspect ratio wing will give.
Antworten
  • high profile and low induced drag.
  • low profile and high induced drag.
  • low profile and low induced drag.

Frage 64

Frage
Aerofoil efficiency is defined by.
Antworten
  • lift over drag.
  • lift over weight.
  • drag over lift.

Frage 65

Frage
The relationship between induced drag and airspeed is, induced drag is.
Antworten
  • directly proportional to the square of the speed.
  • directly proportional to speed.
  • inversely proportional to the square of the speed.

Frage 66

Frage
What is the definition of Angle of Incidence?.
Antworten
  • The angle the underside of the mainplane or tailplane makes with the horizontal
  • The angle the underside of the mainplane or tailplane makes with the longitudinal datum line.
  • The angle the chord of the mainplane or tailplane makes with the horizontal.

Frage 67

Frage
What is Boundary Layer?.
Antworten
  • Separated layer of air forming a boundary at the leading edge
  • Sluggish low energy air that sticks to the wing surface and gradually gets faster until it joins the free stream flow of air.
  • Turbulent air moving from the leading edge to trailing edge.

Frage 68

Frage
What is the collective term for the fin and rudder and other surfaces aft of the centre of gravity that helps directional stability?
Antworten
  • Empennage.
  • Fuselage surfaces.
  • Effective keel surface

Frage 69

Frage
A decrease in incidence toward the wing tip may be provided to
Antworten
  • prevent adverse yaw in a turn.
  • retain lateral control effectiveness at high angles of attack
  • prevent span wise flow in maneuvers.

Frage 70

Frage
For a given aerofoil production lift, whereP = pressure and V = velocity.
Antworten
  • P1 is greater than P2, and V1 is less than V2.
  • P1 is greater than P2, and V1 is greater than V2.
  • P1 is less than P2 and V1 is greater than V2.

Frage 71

Frage
Low wing loading
Antworten
  • increases stalling speed, landing speed and landing run.
  • increases lift, stalling speed and maneuverability
  • decreases stalling speed, landing speed and landing run.

Frage 72

Frage
As a general rule, if the aerodynamic angle of incidence (angle of attack) of an aerofoil is slightly increased, the centre of pressure will.
Antworten
  • move towards the tip.
  • move forward towards the leading edge.
  • never move.

Frage 73

Frage
The 'wing setting angle' is commonly known as.
Antworten
  • angle of dihedral
  • angle of incidence.
  • angle of attack.

Frage 74

Frage
When does the angle of incidence change?.
Antworten
  • It never changes
  • When the aircraft attitude changes
  • When the aircraft is ascending or descending

Frage 75

Frage
As the angle of attack decreases, what happens to the centre of pressure?.
Antworten
  • It moves rearwards.
  • Centre of pressure is not affected by angle of attack decrease.
  • It moves forward

Frage 76

Frage
A decrease in pressure over the upper surface of a wing or aerofoil is responsible for.
Antworten
  • approximately 2/3 (two thirds) of the lift obtained.
  • approximately 1/2 (one half) of the lift obtained
  • approximately 1/3 (one third) of the lift obtained.

Frage 77

Frage
Which of the following types of drag increases as the aircraft gains altitude?.
Antworten
  • Interference drag.
  • Parasite drag.
  • Induced drag.

Frage 78

Frage
The layer of air over the surface of an aerofoil which is slower moving, in relation to the rest of the airflow, is known as.
Antworten
  • none of the above
  • camber layer.
  • boundary layer.

Frage 79

Frage
What is a controlling factor of turbulence and skin friction?.
Antworten
  • Countersunk rivets used on skin exterior.
  • Aspect ratio.
  • Fineness ratio.

Frage 80

Frage
If the C of G is aft of the Centre of Pressure.
Antworten
  • when the aircraft yaws the aerodynamic forces acting forward of the Centre of Pressure.
  • changes in lift produce a pitching moment which acts to increase the change in lift.
  • when the aircraft sideslips, the C of G causes the nose to turn into the sideslip thus applying a restoring moment.

Frage 81

Frage
The upper part of the wing in comparison to the lower.
Antworten
  • develops less lift
  • develops the same lift.
  • develops more lift.

Frage 82

Frage
What effect would a forward CG have on an aircraft on landing?.
Antworten
  • Increase stalling speed.
  • Reduce stalling speed.
  • No effect on landing.

Frage 83

Frage
QNH refers to
Antworten
  • quite near horizon
  • setting the altimeter to zero.
  • setting the mean sea level atmospheric pressure so an altimeter reads the aerodrome altitude above mean sea level.

Frage 84

Frage
QNE refers to
Antworten
  • setting the mean sea level atmospheric pressure in accordance with ICAO standard atmosphere i.e. 1013 millibars.
  • Setting an altimeter to read aerodrome altitude above sea level
  • quite new equipment

Frage 85

Frage
An aspect ratio of 8 : 1 would mean.
Antworten
  • span 64, mean chord 8.
  • mean chord 64, span 8
  • span squared 64, chord 8.

Frage 86

Frage
QFE is.
Antworten
  • airfield pressure.
  • difference between sea level and airfield pressure.
  • sea level pressure.

Frage 87

Frage
For any given speed, a decrease in aircraft weight, the induced drag will.
Antworten
  • decrease
  • remain the same
  • increase.

Frage 88

Frage
The amount of lift generated by a wing is.
Antworten
  • greatest at the tip.
  • constant along the span
  • greatest at the root.

Frage 89

Frage
Induced Drag is
Antworten
  • greatest towards the tip and downwash decreases from tip to root
  • greatest towards the wing tip and downwash is greatest towards the root
  • greatest towards the wing root and downwash is greatest at the tip

Frage 90

Frage
Induced Drag is.
Antworten
  • never equal to profile drag.
  • equal to profile drag at Vmd
  • equal to profile drag at stalling angle
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