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Aerodynamics EASA

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Quiz on Aerodynamics EASA , created by Ahidul Hoque on 11/02/2016.
Ahidul Hoque
Quiz by Ahidul Hoque, updated more than 1 year ago
Ahidul Hoque
Created by Ahidul Hoque almost 9 years ago
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Resource summary

Question 1

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

Question 2

Question
At higher altitudes as altitude increases, pressure
Answer
  • decreases at constant rate.
  • decreases exponentially
  • increases exponentially

Question 3

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

Question 4

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

Question 5

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

Question 6

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

Question 7

Question
What is sea level pressure?.
Answer
  • 1012.3 mb.
  • 1013.2 mb.
  • 1032.2 mb.

Question 8

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

Question 9

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

Question 10

Question
Standard sea level temperature is.
Answer
  • 20 degrees Celsius
  • 0 degrees Celsius.
  • 15 degrees Celsius.

Question 11

Question
As altitude increases, pressure.
Answer
  • decreases exponentially
  • decreases at constant rate
  • increases exponentially

Question 12

Question
Lapse rate usually refers to.
Answer
  • Density.
  • Pressure
  • Temperature

Question 13

Question
Temperature above 36,000 feet will.
Answer
  • increase exponentially
  • decrease exponentially
  • remain constant

Question 14

Question
With increasing altitude pressure decreases and.
Answer
  • 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

Question 15

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

Question 16

Question
At what altitude is the tropopause?.
Answer
  • 36,000 ft.
  • 57,000 ft.
  • 63,000 ft.

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

Question
The millibar is a unit of.
Answer
  • atmospheric temperature
  • pressure altitude.
  • barometric pressure.

Question 22

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

Question 23

Question
A barometer indicates.
Answer
  • pressure
  • density
  • temperature.

Question 24

Question
The amount of water vapour capacity in the air (humidity holding capacity of the air) is.
Answer
  • 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

Question 25

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

Question 26

Question
Which will weigh the least?.
Answer
  • 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.

Question 27

Question
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?.
Answer
  • Absolute humidity
  • Dew point.
  • Relative humidity

Question 28

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

Question 29

Question
What is sea level pressure?.
Answer
  • 1032.2 mb.
  • 1012.3 mb.
  • 1013.2 mb.

Question 30

Question
Which statement concerning heat and/or temperature is true?.
Answer
  • 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.

Question 31

Question
What is absolute humidity?.
Answer
  • 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.

Question 32

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

Question 33

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

Question 34

Question
Above 65,800 ft temperature.
Answer
  • 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.

Question 35

Question
At sea level, ISA atmospheric pressure is.
Answer
  • 14.7 kPa.
  • 10 Bar
  • 14.7 PSI.

Question 36

Question
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?.
Answer
  • the same
  • greater than 20,000ft
  • less than 20,000ft

Question 37

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

Question 38

Question
In the ISA the height of the tropopause is
Answer
  • 11,000 feet.
  • 11,000 metres
  • 36,000 metres

Question 39

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

Question 40

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

Question 41

Question
Put in sequence from the ground up
Answer
  • tropopause, stratosphere, troposphere.
  • tropopause, troposphere, stratosphere.
  • troposphere, tropopause, stratosphere.

Question 42

Question
The International Standard Atmosphere can be described as.
Answer
  • 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.

Question 43

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

Question 44

Question
Above the tropopause air pressure
Answer
  • decreases at a constant rate.
  • decreases exponentially.
  • increases exponentially

Question 45

Question
Which of the following is correct?.
Answer
  • Absolute pressure + Atmospheric pressure = Gauge pressure
  • Absolute pressure = Gauge pressure + Atmospheric pressure
  • Atmospheric pressure = Absolute pressure + Gauge pressure

Question 46

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

Question 47

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

Question 48

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

Question 49

Question
Lift on a delta wing aircraft
Answer
  • 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).

Question 50

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

Question 51

Question
When an aircraft experiences induced drag.
Answer
  • 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.

Question 52

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

Question 53

Question
The rigging angle of incidence of an elevator is.
Answer
  • 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.

Question 54

Question
Which of the following is true?.
Answer
  • 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.

Question 55

Question
The vertical fin of a single engined aircraft is.
Answer
  • 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.

Question 56

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

Question 57

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

Question 58

Question
Vapour trails from the wingtips of an aircraft in flight are caused by.
Answer
  • 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.

Question 59

Question
The chord line of a wing is a line that runs from.
Answer
  • 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.

Question 60

Question
The angle of incidence of a wing is an angle formed by lines.
Answer
  • 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

Question 61

Question
The centre of pressure of an aerofoil is located.
Answer
  • 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

Question 62

Question
Compressibility effect is.
Answer
  • 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.

Question 63

Question
A high aspect ratio wing will give.
Answer
  • high profile and low induced drag.
  • low profile and high induced drag.
  • low profile and low induced drag.

Question 64

Question
Aerofoil efficiency is defined by.
Answer
  • lift over drag.
  • lift over weight.
  • drag over lift.

Question 65

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

Question 66

Question
What is the definition of Angle of Incidence?.
Answer
  • 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.

Question 67

Question
What is Boundary Layer?.
Answer
  • 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.

Question 68

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

Question 69

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

Question 70

Question
For a given aerofoil production lift, whereP = pressure and V = velocity.
Answer
  • 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.

Question 71

Question
Low wing loading
Answer
  • increases stalling speed, landing speed and landing run.
  • increases lift, stalling speed and maneuverability
  • decreases stalling speed, landing speed and landing run.

Question 72

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

Question 73

Question
The 'wing setting angle' is commonly known as.
Answer
  • angle of dihedral
  • angle of incidence.
  • angle of attack.

Question 74

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

Question 75

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

Question 76

Question
A decrease in pressure over the upper surface of a wing or aerofoil is responsible for.
Answer
  • 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.

Question 77

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

Question 78

Question
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.
Answer
  • none of the above
  • camber layer.
  • boundary layer.

Question 79

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

Question 80

Question
If the C of G is aft of the Centre of Pressure.
Answer
  • 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.

Question 81

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

Question 82

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

Question 83

Question
QNH refers to
Answer
  • 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.

Question 84

Question
QNE refers to
Answer
  • 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

Question 85

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

Question 86

Question
QFE is.
Answer
  • airfield pressure.
  • difference between sea level and airfield pressure.
  • sea level pressure.

Question 87

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

Question 88

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

Question 89

Question
Induced Drag is
Answer
  • 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

Question 90

Question
Induced Drag is.
Answer
  • never equal to profile drag.
  • equal to profile drag at Vmd
  • equal to profile drag at stalling angle
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