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Mod 8 > Questions > Flashcards

Questions Flashcards

1
Q

Atmosphere percentages

A

78% Nitrogen 21% Oxygen 1% Others

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2
Q

When does the Troposphere end

A

36,000 ft

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3
Q

What is lapse rate of Troposphere

A

1.98 degrees decrease per 1000 feet in Troposphere

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4
Q

Where is the water vapour content zero

A

Stratosphere

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5
Q

What is the equation for density

A

Mass divided by volume

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6
Q

When pressure rises, what happens to density

A

Density rises

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7
Q

When temperature increases, what happens to density

A

Density drops

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8
Q

When humidity increases , what happens to density?

A

Density drops

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9
Q

What is the average temperature on a standard day

A

15 degrees

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10
Q

What measures humidity (water vapour)

A

Hygrometer

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11
Q

What is the equation for total pressure

A

Total pressure = dynamic pressure + static pressure

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12
Q

What is a Transition point

A

Point where boundary layer turns to turbulent flow

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13
Q

What is a Stagnation point

A

Where boundary layer starts

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14
Q

What is a Seperation Point

A

Boundary layer breaks away from surface of wing

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15
Q

What is a laminar boundary layer

A

Orderly motion

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16
Q

What is a turbulent boundary layer

A

Non orderly motion

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17
Q

Atmosphere Pressure Units:

Atmosphere or Bar

A

1

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18
Q

Atmosphere Pressure Units:

Kg/cm ²

A

1.033

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19
Q

Atmosphere Pressure Units:

PSI

A

14.7

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20
Q

Atmosphere Pressure Units:

HG ( Inches of Mercury)

A

29.92

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21
Q

Atmosphere Pressure Units:

KPA ( Kilo Pascal)

A

101.32

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22
Q

Atmosphere Pressure Units:

HPA (Hecto Pascal)

A

10132

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23
Q

Atmosphere Pressure Units:

H²O (inches of water)

A

406.8

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24
Q

Atmosphere Pressure Units:

MB ( Milibars)

A

1013.2

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25
Q

Atmosphere Pressure Units:

mmHG (mm of mercury)

A

760

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26
Q

Lift acts on _______ to relative airflow

A

90 degrees

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27
Q

What is relative wind

A

Direction of the airflow with repsect to an airfoil

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28
Q

What is Downwash

A

Form of drag produced by lift

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29
Q

What is Upwash

A

Deflection of the oncoming airstream over the wing

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30
Q

How are Vortices formed

A

From top and bottom airflows meeting at trailing edge

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31
Q

What way are vortices on the right wing

A

Anticlockwise

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32
Q

What way are vortices on the left wing

A

Clockwise

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33
Q

What wings shape is best for vortices

A

Staight or Epileptical

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34
Q

What do wing tip fences do

A

Save 10% to 15% fuel efficency

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35
Q

What is an airfoil

A

Any surface designed to obtain a reaction from the air it is passing through

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36
Q

What is a Chordline

A

From center of leading edge to trailing edge

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37
Q

What is the Mean Aerodynamic Chord

A

Cross section of airfoil

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38
Q

What is Camber

A

Curvature of upper and lower surfaces of an airfoil from leading edge to trailing edge

39
Q

What is the Angle of Incidence

A

The angle between Longitudinal Axis and Chord Line of Wing

40
Q

What is Washin

A

Angle of incidence increases from root to tip

41
Q

What is Washout

A

Angle of incidence decreases from root to tip

42
Q

What is a planform

A

Shape of wing when viewed from top

43
Q

What is better, a high stalling speed or a low stalling speed

A

Low stalling speed

44
Q

How does a pilot counteract a stall

A

By going nose down

45
Q

What is form drag

A

Passes around a solid object , forms vertices , no longer streamline flow

46
Q

What is Interference Drag

A

Drag created by bumps in service Eg: wing to body

47
Q

What is skin friction

A

Molecules sticking to material of aircraft

48
Q

If you fly slow, you need a larger _____ and _______ increases

A

Angle of attack, Induced drag

49
Q

If you fly fast, the _______ increases

A

Parasite Drag

50
Q

What is the most dangerous kind of ice

A

Clear ice

51
Q

What are the 4 acting forces on an aircraft?

A

Lift, Weight , Thrust , Drag

52
Q

What are the 2 couples of force on an aircraft

A

Thrust = Drag

Lift = Weight

53
Q

What controls pitch

A

Elevators

54
Q

What controls roll

A

Ailerons

55
Q

What controlls Yaw

A

Rudder

56
Q

What gives Longitudinal Control

A

Elevators

57
Q

What gives Lateral Control

A

Ailerons

58
Q

What gives Directional Control

A

Rudder

59
Q

What is used to move on the Lateral Axis

A

Elevators

60
Q

What is used to move on the Longitudinal Axis

A

Ailerons

61
Q

What is used to move on the Vertical Axis

A

Rudder

62
Q

What is used to move on the Normal Axis

A

Rudder

63
Q

What is the large aircraft glide ratio

A

10:1

64
Q

What is a normal turn

A

Centrifugal Force = Horizontal Lift

65
Q

What is a Slipping Turn

A

Centrifugal Force < Horizontal Lift

66
Q

What is a Skidding Turn

A

Centrifugal Force > Horizontal Lift

67
Q

What is shown on a VG diagram/ Graph

A

Airspeed (x) and Load factor (y)

68
Q

What is FEP

A

Flight Envalope Protection

69
Q

What do High Lift devices do

A

Provide extra lift during take off and landing, also increases drag

70
Q

What are examples of high lift devices (3)

A

Leading Edge Flaps

Leading Edge Slats

Trailing Edge Slots

71
Q

What is Mcrit

A

Mach Critical Speed

72
Q

What is Dutch Roll

A

Interaction between Roll and Yaw

Directional and Lateral Stability

73
Q

What does the Yaw Damper do

A

Stops rudder from sending aircraft in a circle

74
Q

What is Positive Static Stability

A

When disturbed it returns to equilibrum

75
Q

What is Negative Static Stability

A

When disturbed the object tends to continue in the same direction of distrubance

76
Q

What is Neutral Static Stability

A

When disturbed , will not try to move further away nor return to original position

77
Q

What is Dynamic Stability a Subcatagory of

A

Positive Static Stability

78
Q

What is Positive Dynamic Stability

A

Overshoot at first, join flight path by the end

79
Q

What is Negative Dynamic Stability

A

Overshoot flightpath more and more each time, doesnt join orginal flight path

80
Q

What is Neutral Dynamic Stability

A

Overshoots flight path the same amount each time, doesnt join orignal flight path

81
Q

What does the RATE Gyro do

A

Gives info to Yaw Damper

82
Q

A symmetrical aerofoil section at 0 degrees angle of attack will….

A

Produce no lift

83
Q

The ratio of the average chord to wingspan is the…?

A

Aspect Ratio

84
Q

The ratio of the Root Chord to tip chord on a wing is the…?

A

Taper Ratio

85
Q

What is the benefits of a high aspect ratio wing is to reduce the…?

A

Induced Drag

86
Q

When Extension flaps are deployed without leading edge devices the ….

A

Centre of pressure moves rearward causing the nose to pitch down

87
Q

The most efficent angle of attack for an aerofoil may be obtained by referring to the…

A

Graph of lift/drag ratio to angle of attack

88
Q

Lift produced by an aerofoil varies…

A

Directly with the area of the aerofoil

89
Q

When an aeroplane stalls, the CofP will move, causing the

A

Stall warning system to operate

90
Q

What does deploying Extension Fowler flaps do

A

Increase wing area

Increase CL

Lower stalling speed

91
Q

What helps Longitudinal Stability around Lateral Axis

A

CofG

Pitch of Wings

Horizontal Stabiliser

92
Q

What helps Lateral Stability around Longitudinal Axis?

A

Dihedral Angle

Sweptback Wings

Kneel Effect

93
Q

What helps Directional Stability around the Vertical Axis

A

Vertical Stabiliser

Lateral Stability

Mod 8 (1 decks)

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