Quiz
Aerodynamics EASA
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Questions in this quiz (90)
1The ISA
- Aassumes a standard day.
- Bis taken from the equator
- Cis taken from 45 degrees latitude
2At higher altitudes as altitude increases, pressure
- Adecreases at constant rate.
- Bdecreases exponentially
- Cincreases exponentially
3When the pressure is half of that at sea level, what is the altitude?.
- A12,000 ft.
- B18,000 ft.
- C8,000 ft.
4If gauge pressure on a standard day at sea level is 25 PSI, the absolute pressure is.
- A39.7 PSI.
- B10.3 PSI.
- C43.8 PSI.
5Pressure decreases.
- Ainversely proportional to temperature.
- Bproportionally with a decreases in temperature.
- CPressure and temperature are not related.
6As air gets colder, the service ceiling of an aircraft.
- Areduces.
- Bincreases.
- Cremains the same.
7What is sea level pressure?.
- A1012.3 mb.
- B1013.2 mb.
- C1032.2 mb.
8How does IAS at the point of stall vary with height?.
- AIt decreases.
- BIt is practically constant.
- CIt increases.
9What is the lapse rate with regard to temperature?
- A4°C per 1000 ft.
- B1.98°C per 1000 ft.
- C1.98°F per 1000 ft.
10Standard sea level temperature is.
- A20 degrees Celsius
- B0 degrees Celsius.
- C15 degrees Celsius.
11As altitude increases, pressure.
- Adecreases exponentially
- Bdecreases at constant rate
- Cincreases exponentially
12Lapse rate usually refers to.
- ADensity.
- BPressure
- CTemperature
13Temperature above 36,000 feet will.
- Aincrease exponentially
- Bdecrease exponentially
- Cremain constant
14With increasing altitude pressure decreases and.
- Atemperature decreases at the same rate as pressure reduces.
- Btemperature decreases but at a lower rate than pressure reduces
- Ctemperature remains constant to 8000 ft
15What is the temperature in comparison to ISA conditions at 30,000ft?.
- A60°C.
- B0°C
- C45°C.
16At what altitude is the tropopause?.
- A36,000 ft.
- B57,000 ft.
- C63,000 ft.
17What approximate percentage of oxygen is in the atmosphere?.
- A12%.
- B21%.
- C78%.
18Which has the greater density?.
- AAir at low altitude.
- BAir at high altitude.
- CIt remains constant.
19At what altitude does stratosphere commence approximately?.
- ASea level.
- B36,000 ft.
- C63,000 ft.
20A pressure of one atmosphere is equal to.
- A14.7 psi.
- B1 inch Hg.
- C100 millibar.
21The millibar is a unit of.
- Aatmospheric temperature
- Bpressure altitude.
- Cbarometric pressure.
22With an increase in altitude under I.S.A. conditions the temperature in the troposphere.
- Aremains constant.
- Bdecreases.
- Cincreases.
23A barometer indicates.
- Apressure
- Bdensity
- Ctemperature.
24The amount of water vapour capacity in the air (humidity holding capacity of the air) is.
- Agreater on a colder day, and lower on a hotter day
- Bdoesn't have a significant difference.
- Cgreater on a hotter day and lower on a colder day
25Which condition is the actual amount of water vapour in a mixture of air and water?.
- ARelative humidity.
- BAbsolute humidity
- CDew point.
26Which will weigh the least?.
- A98 parts of dry air and 2 parts of water vapour
- B50 parts of dry air and 50 parts of water vapour
- C35 parts of dry air and 65 parts of water vapour.
27Which 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?.
- AAbsolute humidity
- BDew point.
- CRelative humidity
28The speed of sound in the atmosphere
- Achanges with a change in pressure.
- Bvaries according to the frequency of the sound.
- Cchanges with a change in temperature.
29What is sea level pressure?.
- A1032.2 mb.
- B1012.3 mb.
- C1013.2 mb.
30Which statement concerning heat and/or temperature is true?.
- ATemperature is a measure of the kinetic energy of the molecules of any substance.
- BTemperature is a measure of the potential energy of the molecules of any substance.
- CThere is an inverse relationship between temperature and heat.
31What is absolute humidity?.
- AThe temperature to which humid air must be cooled at constant pressure to become saturated.
- BThe actual amount of the water vapour in a mixture of air and water.
- CThe 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.
32The temperature to which humid air must be cooled at constantpressuretobecome saturated is called.
- Arelative humidity.
- Bdew point.
- Cabsolute humidity.
33Density changes with altitude at a rate.
- Aof 2kg/m3 per 1000 ft
- Bwhich changes with altitude.
- Cwhich is constant until 11 km.
34Above 65,800 ft temperature.
- Adecreases by 1.98°C up to 115,000 ft.
- Bremains constant up to 115,000 ft.
- Cincreases by 0.303°C up to 115,000 ft.
35At sea level, ISA atmospheric pressure is.
- A14.7 kPa.
- B10 Bar
- C14.7 PSI.
36On a very hot day with ambient temperature higher than ISA, the pressure altitude is 20,000 ft. How much will the density altitude be?.
- Athe same
- Bgreater than 20,000ft
- Cless than 20,000ft
37The atmospheric zone where the temperature remains fairly constant is called the.
- AStratosphere.
- BIonosphere.
- CTroposphere.
38In the ISA the height of the tropopause is
- A11,000 feet.
- B11,000 metres
- C36,000 metres
39In the ISA the sea level pressure is taken to be.
- A14 PSI.
- B1013.2 mb.
- C1.013 mb
40In the ISA the temperature lapse rate with altitude is taken to be :
- Adependent on pressure and density changes.
- Blinear.
- Cnon linear.
41Put in sequence from the ground up
- Atropopause, stratosphere, troposphere.
- Btropopause, troposphere, stratosphere.
- Ctroposphere, tropopause, stratosphere.
42The International Standard Atmosphere can be described as.
- Athe atmosphere at 45 degrees north latitude.
- Bthe atmosphere at the equator with certain conditions
- Cthe atmosphere which can be used Worldwide to provide comparable performance results.
43The temperature lapse rate below the tropopause is.
- A1°C per 1000 ft.
- B2°C per 1000 ft.
- C3°C per 1000 ft.
44Above the tropopause air pressure
- Adecreases at a constant rate.
- Bdecreases exponentially.
- Cincreases exponentially
45Which of the following is correct?.
- AAbsolute pressure + Atmospheric pressure = Gauge pressure
- BAbsolute pressure = Gauge pressure + Atmospheric pressure
- CAtmospheric pressure = Absolute pressure + Gauge pressure
46As the altitude increases what happens of the ratio of Nitrogen to Oxygen?.
- AIncreases.
- BDecreases.
- CStays the same.
47What happens to the density of air as altitude is increased?.
- ADecreases.
- BStays the same.
- CIncreases.
48An aircraft is travelling at a speed of 720 nautical miles per hour. To calculate speed in MPH you.
- Adivide by 0.83.
- Bmultipy by 0.83
- Cmultiply by 1.15.
49Lift on a delta wing aircraft
- Aincreases with an increased angle of incidence (angle of attack).
- Bdoes not change with a change in angle of incidence (angle of attack).
- Cdecreases with an increase in angle of incidence (angle of attack).
50The CofP is the point where.
- Athe lift can be said to act.
- Bthe three axis of rotation meet.
- Call the forces on an aircraft act
51When an aircraft experiences induced drag.
- Aair flows under the wing span wise towards the root and on top of the wing span wise towards the tip.
- BNeither a) or b) since induced drag does not caused by span wise flow.
- Cair flows under the wing span wise towards the tip and on top of the wing span wise towards the root.
52At stall, the wingtip stagnation point.
- Adoesn’t move
- Bmoves toward the lower surface of the wing.
- Cmoves toward the upper surface of the wing.
53The rigging angle of incidence of an elevator is.
- Athe angle between the bottom surface of the elevator and the longitudinal datum.
- Bthe angle between the bottom surface of the elevator and the horizontal in the rigging position.
- Cthe angle between the mean chord line and the horizontal in the rigging position.
54Which of the following is true?.
- ALift acts at right angles to the relative airflow and weight acts vertically down.
- BLift acts at right angles to the wing chord line and weight acts vertically down.
- CLift acts at right angles to the relative air flow and weight acts at right angles to the aircraft centre line.
55The vertical fin of a single engined aircraft is.
- Aparallel with the longitudinal axis but not the vertical axis.
- Bparallel with both the longitudinal axis and vertical axis.
- Cparallel with the vertical axis but not the longitudinal axis.
56What happens to air flowing at the speed of sound
when it enters a converging duct?.- AVelocity increases, pressure and density decreases.
- BVelocity, pressure and density increase.
- CVelocity decreases, pressure and density increase
57As the angle of attack of an airfoil increases the centre of pressure.
- Aremains stationary.
- Bmoves aft.
- Cmoves forward.
58Vapour trails from the wingtips of an aircraft in flight are caused by.
- Alow pressure above the wing and high pressure below the wing causing vortices.
- Blow pressure above the wing and high pressure below the wing causing a temperature rise.
- Chigh pressure above the wing and low pressure below the wing causing vortices.
59The chord line of a wing is a line that runs from.
- Athe centre of the leading edge of the wing to the trailing edge.
- Bhalf way between the upper and lower surface of the wing.
- Cone wing tip to the other wing tip.
60The angle of incidence of a wing is an angle formed by lines.
- Aparallel to the chord line and longitudinal axis
- Bparallel to the chord line and the vertical axis.
- Cparallel to the chord line and the lateral axis
61The centre of pressure of an aerofoil is located.
- A30 - 40% of the chord line forward of the leading edge
- B50% of the chord line back from the leading edge.
- C30 - 40% of the chord line back from the leading edge
62Compressibility effect is.
- Adrag associated with the form of an aircraft.
- Bthe increase in total drag of an aerofoil in transonic flight due to the formation of shock waves.
- Cdrag associated with the friction of the air over the surface of the aircraft.
63A high aspect ratio wing will give.
- Ahigh profile and low induced drag.
- Blow profile and high induced drag.
- Clow profile and low induced drag.
64Aerofoil efficiency is defined by.
- Alift over drag.
- Blift over weight.
- Cdrag over lift.
65The relationship between induced drag and airspeed is, induced drag is.
- Adirectly proportional to the square of the speed.
- Bdirectly proportional to speed.
- Cinversely proportional to the square of the speed.
66What is the definition of Angle of Incidence?.
- AThe angle the underside of the mainplane or tailplane makes with the horizontal
- BThe angle the underside of the mainplane or tailplane makes with the longitudinal datum line.
- CThe angle the chord of the mainplane or tailplane makes with the horizontal.
67What is Boundary Layer?.
- ASeparated layer of air forming a boundary at the leading edge
- BSluggish low energy air that sticks to the wing surface and gradually gets faster until it joins the free stream flow of air.
- CTurbulent air moving from the leading edge to trailing edge.
68What is the collective term for the fin and rudder
and other surfaces aft of the centre of gravity that
helps directional stability?- AEmpennage.
- BFuselage surfaces.
- CEffective keel surface
69A decrease in incidence toward the wing tip may be
provided to- Aprevent adverse yaw in a turn.
- Bretain lateral control effectiveness at high angles of attack
- Cprevent span wise flow in maneuvers.
70For a given aerofoil production lift, whereP = pressure and V = velocity.
- AP1 is greater than P2, and V1 is less than V2.
- BP1 is greater than P2, and V1 is greater than V2.
- CP1 is less than P2 and V1 is greater than V2.
71Low wing loading
- Aincreases stalling speed, landing speed and landing run.
- Bincreases lift, stalling speed and maneuverability
- Cdecreases stalling speed, landing speed and landing run.
72As a general rule, if the aerodynamic angle of incidence (angle of attack) of an aerofoil is slightly increased, the centre of pressure will.
- Amove towards the tip.
- Bmove forward towards the leading edge.
- Cnever move.
73The 'wing setting angle' is commonly known as.
- Aangle of dihedral
- Bangle of incidence.
- Cangle of attack.
74When does the angle of incidence change?.
- AIt never changes
- BWhen the aircraft attitude changes
- CWhen the aircraft is ascending or descending
75As the angle of attack decreases, what happens to the centre of pressure?.
- AIt moves rearwards.
- BCentre of pressure is not affected by angle of attack decrease.
- CIt moves forward
76A decrease in pressure over the upper surface of a wing or aerofoil is responsible for.
- Aapproximately 2/3 (two thirds) of the lift obtained.
- Bapproximately 1/2 (one half) of the lift obtained
- Capproximately 1/3 (one third) of the lift obtained.
77Which of the following types of drag increases as the aircraft gains altitude?.
- AInterference drag.
- BParasite drag.
- CInduced drag.
78The layer of air over the surface of an aerofoil which is slower moving, in relation to the rest of the airflow, is known as.
- Anone of the above
- Bcamber layer.
- Cboundary layer.
79What is a controlling factor of turbulence and skin friction?.
- ACountersunk rivets used on skin exterior.
- BAspect ratio.
- CFineness ratio.
80If the C of G is aft of the Centre of Pressure.
- Awhen the aircraft yaws the aerodynamic forces acting forward of the Centre of Pressure.
- Bchanges in lift produce a pitching moment which acts to increase the change in lift.
- Cwhen the aircraft sideslips, the C of G causes the nose to turn into the sideslip thus applying a restoring moment.
81The upper part of the wing in comparison to the lower.
- Adevelops less lift
- Bdevelops the same lift.
- Cdevelops more lift.
82What effect would a forward CG have on an aircraft on landing?.
- AIncrease stalling speed.
- BReduce stalling speed.
- CNo effect on landing.
83QNH refers to
- Aquite near horizon
- Bsetting the altimeter to zero.
- Csetting the mean sea level atmospheric pressure so an altimeter reads the aerodrome altitude above mean sea level.
84QNE refers to
- Asetting the mean sea level atmospheric pressure in accordance with ICAO standard atmosphere i.e. 1013 millibars.
- BSetting an altimeter to read aerodrome altitude above sea level
- Cquite new equipment
85An aspect ratio of 8 : 1 would mean.
- Aspan 64, mean chord 8.
- Bmean chord 64, span 8
- Cspan squared 64, chord 8.
86QFE is.
- Aairfield pressure.
- Bdifference between sea level and airfield pressure.
- Csea level pressure.
87For any given speed, a decrease in aircraft weight, the induced drag will.
- Adecrease
- Bremain the same
- Cincrease.
88The amount of lift generated by a wing is.
- Agreatest at the tip.
- Bconstant along the span
- Cgreatest at the root.
89Induced Drag is
- Agreatest towards the tip and downwash decreases from tip to root
- Bgreatest towards the wing tip and downwash is greatest towards the root
- Cgreatest towards the wing root and downwash is greatest at the tip
90Induced Drag is.
- Anever equal to profile drag.
- Bequal to profile drag at Vmd
- Cequal to profile drag at stalling angle
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- Quiz on Aerodynamics EASA , created by Ahidul Hoque on 11/02/2016.
- Author
- Ahidul Hoque
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- English
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