問題一覧
1
During a turn
insufficient rudder causes slip
2
A gauge pressure of 25,3 PSI (in the International Standard Atmosphere) what is absolute pressure
40.0 PSI
3
The load factor of a given aircraft in a given condition of flight is defined as
the lift divided by the weight
4
Directional stability is stability about
the normal axis
5
reduction in air density
reduces the wing’s lift
6
A minimum radius turn is easier achieved
at low altitude
7
Drag acts in a direction parallel with the relative airflow, and is therefore
always perpendicular to lift (where generated
8
If the weight of an aircraft is increased
minimum drag speed will increase
9
when trailing edge flaps are deployed, the camber and the angle of attack are both
increased
10
The chord line of a wing is a line that
runs from the centre of the leading edge of the wing to the trailing edge.
11
the aspect ratio of a wing is the ratio of
its span to its aerodynamic chord
12
In the case of an aircraft making a turn, the force causing centripetal acceleration
is the horizontal component of the lift acting on the aircraft
13
Ground effect
interferes’ with the formation of the tip vortices.
14
To achieve a maximum rate turn, it can be shown that
Wing loading must be as low as possible
15
Positive longitudinal dynamic stability is provided solely
by the horizontal stabiliser
16
It is possible to change the static pressure of air by forcing the
air through a venture tube. As air flows through a narrowing port, its static pressure will decrease
17
Dogtooth extensions, leading edge cuffs and vortillons are all designed to
prevent wing tip stalling at low speed
18
Induced drag
is greater at low aspect ratio wing
19
Temperature is a measure of
the internal kinetic energy of a substance As temperature increases, the molecular movement of the substance Increases
20
Lapse rate comparable value of
1.98°c/1000ft often rounded 2°c/1000 ft
21
In any manoeuvre, the stalling speed is
proportional to the square root of the load factor
22
Density is
expressed in grams, or kilograms per cubic meters for metric or SI units
23
Absolute pressure
= Gauge pressure + Atmospheric pressure
24
Wing tip vortices on conventional aeroplanes create
additional drag and reduce lift
25
Friction drag can be reduced by
delaying the point at which laminar flow becomes turbulent
26
Compared to straight and level flight, when an aeroplane is turning
stall speed increases and load factor increases
27
pressure altitude
The height that a given pressure occurs
28
Profile drag
increases with the square of the IAS
29
Winglets
reduce tip vortices, increasing the effective aspect ratio
30
If the aeroplane is loaded with the centre of gravity too far aft
the aeroplane may assume a nose up rather than a nose down attitude
31
At small angle of attack the Cp is located between
40to 50% of the chord
32
If an aircraft with swept wings begins to tip-stall
it will pitch up
33
A winglet
reduces drag and increases thrust
34
High winged aircraft usually have less dihedral than low winged aircraft
because the pendulum effect of a high winged aircraft provides a considerable amount of lateral stability
35
Movement about the normal axis is called
yawing
36
Moving the centre of gravity forward, away from the centre of pressure will
increase longitudinal stability
37
Ozone is mainly found in
stratosphere and troposphere
38
dew point
is the temperature to which humid air must be cooled at a constant pressure to become saturated
39
When a turn is executed without any skid or slip, it
is called a coordinated turn
40
incorporation of an artificial stability mechanism, using sensors, computers and inputs to the aircraft’s trim or primary control systems
this is known as active stability
41
An increase in the angle of attack will cause
the centre of pressure to move forward
42
Ground speed can be determined
by the vector sum of the aircraft's true airspeed and the current wind speed and direction.
43
If horizontal stabilizer is re-positioned to a location further from the aircraft’s centre of gravity
it will Increase the aircraft’s longitudinal stability.
44
In straight and level flight
lift = weight, and thrust = drag
45
Isobars used on a weather map are
lines of equal pressure
46
Wing loading is calculated by
weight divided by gross wing area
47
As an incompressible fluid flows through a duct of varying cross sectional area, the mass flow rate remains constant. this is defined as
the principle of continuity
48
An increase in altitude will cause the rate of turn
to decrease
49
The airspeed indicator uses pitot pressure inside the capsule, and static pressure outside the capsule and
thus measures dynamic pressure
50
Lapse rate is referred to
the decrease of temperature with an increase of height
51
Blanketing effect will increase
lateral stability
52
Flaps at landing position
decrease landing speed
53
If aircraft moves in roll the axis it is moving about
is Longitudinal
54
Ground effect results
in increased lift and reduced drag
55
Longitudinal dihedral angle is defined asLongitudinal dihedral angle is defined as
the difference the angle of incidence of the mainplane and tailplane
56
The resultant airflow that affects the wing is made
by the relative horizontal and vertical airflow components.
57
The power provided by jet and piston engines alike decrease with altitude
due mainly to decreasing air density
58
When an aeroplane is in an unpowered descent, a component of the weight
acts forwards along the flight path, and provides the ‘thrust’ to drive the aeroplane forwards against the drag
59
Vortex generators
move the transition point forwards towards the leading edge of the wing
60
Longitudinal stability is pitch stability, or stability around
the lateral axis of the aeroplane
61
Accretion of ice on
a wing will increase stall speed
62
If, after disturbance, an aeroplane initially returns to its equilibrium state.
It has static stability and may be dynamically stable
63
The aero foil produces zero lift at a certain
negative angle of attack
64
Dihedral
is an outward and upward inclination of the wings to increases lateral stability.
65
Rate of climb is dependent upon
excess power
66
The best gliding angle is achieved by using the angle of attack that gives
the best L/D ratio
67
Anhedral
is an outwards and downward inclination of the wings to reduce stability.
68
Porpoising
is a longitudinal instability
69
At high temperature airfield a longer take-off run is
required for a fixed throttle setting
70
Angle of attack
is the angle between oncoming air (or relative airflow) and the chord line of the wing.
71
Weather systems exists in the
troposphere only
72
Air at low altitude
has the greater density
73
pressure is caused by
the mass air acting under the force of gravity on a given area
74
During a turn, for any given speed
the radius of turn will depend upon the angle of bank
75
The normal axis of an aircraft passes
through the center of gravity
76
When an aeroplane with swept wings sideslips, the leading wing has
greater span than the trailing wing
77
In aviation the actual atmospheric temperature is very often expressed
as the outside air temperature (OAT
78
Blanketing effect will increase
lateral stability
79
A wing of area 12 m² and span of 12m has an aspect ratio of
12
80
gases proportions in the atmosphere are in the following (by volume
Nitrogen 78% Oxygen 21
81
A standard rate turn is defined as a 3° per second turn, which completes a 360° turn in 2 minutes
This is known as a 2-minute turn or rate one (180°/min)
82
The tropopause occurs where
the temperature ceases to decrease as altitude increases
83
An increase in aircraft weight
will increase the stall speed
84
The glide ratio is the same as the
lift/drag ratio
85
It should be noted that at about 18,000 ft. the pressure
is half the sea level value
86
Skin friction drag increases with
increasing turbulent boundary layer
87
Stability of an aircraft
is the tendency of the aircraft to return to its original trimmed position after having been displaced
88
Standard sea level temperature
is 15 degrees Celsius
89
Fowler flap
increases the area of the wing
90
Primary controls
ailerons, elevator (or, in some installations, stabilator) rudder