問題一覧
1
Which conditions are favorable for the formation of a surface based temperature inversion?
Clear, cool nights with calm or light wind.
2
Which statement is true concerning squall lines?
They offer the most intense weather hazards to aircraft.
3
What is the standard temperature as 6,500 feet?
2°C
4
What prevents air from flowing directly from high-pressure areas to low-pressure areas?
Coriolis force.
5
How is moisture reduced from a parcel of air?
Sublimation and condensation.
6
During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the
Power and vertical velocity required to remain on the proper glidepath.
7
The general circulation of air associated with a high-pressure area in the Northern Hemisphere is
outward, downward, and clockwise.
8
During preflight preparation, weather report forecasts which are not routinely available at the local service outlet (AFSS) can best be obtained by means of
Weather Forecast Office (WFO).
9
Ice pellets encountered during flight are normally evidence that
freezing rain exists at higher altitudes.
10
What are the characteristics of an unstable atmosphere?
A warm, humid air mass.
11
As air temperature increases, density altitude will
increase.
12
Which feature is associated with the tropopause?
Abrupt change in temperature lapse rate.
13
How can you obtain the pressure altitude on flights below 18,000 feet?
Set your altimeter to 29.92" Hg.
14
What is typical characteristic of a stable air mass?
Continuous precipitation.
15
When flying cross-country, in the Northern Hemisphere, you experience a continuous left crosswind which is associated with a major wind system. This indicates that you
are flying toward an area of generally unfavorable weather conditions.
16
When advection fog has developed, what may tend to dissipate or lift the fog into low stratus clouds?
Wind stronger than 15 knots
17
Fog produced by frontal activity is a result of saturation due to
evaporation of precipitation.
18
Which feature is associated with the tropopause?
Abrupt change in temperature lapse rate.
19
What lifts advection fog into low stratus clouds?
Surface winds of approximately 15 knots or stronger.
20
Consider the following statements about mountain waves: 1. Mountain waves always develop in a series on the upwind (windward) side of mountain ridges. 2. In a mountain wave, the air dips sharply downward immediately to the lee side of a ridge, before rising and falling in a wave motion for a considerable distance downstream. 3. If the air is humid and the wave is of large amplitude, lenticular (lens-shaped) clouds mark the wave's crest. 4. In a typical wave, the greatest amplitude is seldom more than 1,000 feet above the ridge crest elevation. From the statements above, select those which are true.
2 and 3.
21
Which is true with respect to a high- or low-pressure system?
A high-pressure area or ridge is an area of descending air.
22
The position of fronts and pressure systems (as of chart time) is best determined by referring to a
Surface Analysis Chart.
23
Ice pellets encountered during flight normally are evidence that
a warm front is about to pass.
24
What course of action should the pilot take if encountering freezing rain?
Climb because the temperature is warmer at a higher altitude.
25
The wind system associated with a low-pressure area in the Northern Hemisphere is
a cyclone and is caused by Coriolis force.
26
Every physical process of weather is accompanied by or is the result of
a heat exchange.
27
Under what condition is indicated altitude the same as true altitude?
When at sea level under standard conditions.
28
In what ways do advection fog, radiation fog, and steam fog differ in their formation or location?
Radiation fog is restricted to land areas; advection fog is most common along coastal areas; steam fog forms over a water surface.
29
Which is true concerning the radar weather report (SD) for KOKC? KOKC 1934 LN 8TRW++/+ 86/40 164/60 199/115 15W L2425 MT 570 AT 159/65 2 INCH HAIL RPRTD THIS CELL
The maximum tops of the cells is 57,000 feet located 65 NM southeastof the station.
30
Under which condition will pressure altitude be equal to true altitude?
When standard atmospheric conditions exist.
31
The most current en route and destination weather information for an instrument flight should be obtained from the
AFSS.
32
You have delayed your flight to allow a fast moving cold front to clear your destination airport before your arrival. What type of flying conditions would you expect after the front has passed?
Clear skies with gusty, turbulent winds and cooler temperatures.
33
During the winter months in the middle latitudes, the jet stream toward the
south and speed increases.
34
When flying into a low-pressure area in the Northern Hemisphere, the wind direction and velocity will be from the
left and increasing.
35
What are characteristics of stable air?
Poor visibility; steady precipitation; stratus clouds.
36
There is a high pressure system that is located south of your planned route in the Northern Hemisphere on a west to east cross-country flight. To take advantage of favorable winds, you would plan your route
on the north side of the high pressure area.
37
Given the following PIREP: UA/OV KTUL/TM 1800/FL 120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089
light to moderate rime.
38
Which is true regarding the use of airborne weather-avoidance radar for the recognition of certain weather conditions?
The radarscope provides no assurance of avoiding instrument weather conditions.
39
Which is true regarding high- or low-pressure systems?
A low-pressure area or trough is an area of rising air.
40
If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the clouds will be
stratus type with little vertical development and little or no turbulence.
41
If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potential hazard exists due to
wind shear.
42
When an air mass is stable, which of these conditions are most likely to exist?
Smoke, dust, haze, etc., concentrated at the lower levels with resulting poor visibility.
43
Moisture is added to air by
evaporation and sublimation.
44
The strength and location of the jet stream is normally
weaker and farther north in the summer.
45
The weather condition normally associated with unstable air is
Good visibility, except in blowing sand or snow.
46
What causes wind?
Pressure differences.
47
The conditions necessary for the formation of stratiform clouds are a lifting action and
stable, moist air.
48
From which measurement of the atmosphere can stability be determined?
The ambient lapse rate.
49
What is indicated if ice pellets are encountered at 8,000 feet?
Freezing rain at higher altitude.
50
What determines the structure or type of clouds which will form as a result of air being forced to ascend?
The stability of the air before lifting occurs.
51
To best determine observed weather conditions between weather stations, the pilot should refer to
pilot reports.
52
What is a characteristic of stable air?
Stratiform clouds.
53
What is an important characteristic of wind shear?
It can be present at any level and can exist in both a horizontal and vertical direction.
54
During departure, under conditions of suspected low-level wind shear, a sudden decrease in headwind will cause
a loss in airspeed equal to the decrease in wind velocity.
55
Which is true regarding a cold front occlusion? The air ahead of the warm front
is warmer than the air behind the overtaking cold front.
56
Which is true regarding the development of convective circulation?
Cool air must sink to force the warm air upward.
57
Refer to the excerpt from the following METAR report: KTUS 08004KT 4SM HZ 26/04 A2995 RMK RAE36 At approximately what altitude AGL should bases of convective-type cumuliform clouds be expected?
8,800 feet.
58
What is a characteristic of stable air?
Stratiform clouds.
59
Which is a characteristic of stable air?
Restricted visibility.
60
Which situation would most likely result in freezing precipitation? Rain falling from air which has a temperature of
more than 32°F into air having a temperature of 32°F or less.
61
Which in-flight hazard is most commonly associated with warm fronts?
Precipitation-induced fog.
62
What are the standard temperature and pressure values for sea level?
+15°C and 29.92" Hg
63
Which is true regarding actual air temperature and dewpoint temperature spread? The temperature spread
decreases as the relative humidity increases.
64
In the Northern Hemisphere, surface wind spirals clockwise and outward from high pressure and counterclockwise and inward into low pressure. Where would wind not be consistent with this concept?
Over mountainous areas.
65
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
Smooth air, poor visibility, fog, haze, or low clouds.
66
Which would increase the stability of an air mass?
Cooling from below.
67
In the Northern Hemisphere, the wind is deflected to the
right by Coriolis force.
68
A situation most conducive to the formation of advection fog is
an air mass moving inland from the coastline during the winter.
69
The formation of either predominantly stratiform or predominantly cumuliform clouds is dependent upon the
stability of air being lifted.
70
Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to
friction between the wind and the surface.
71
When weather information indicates that abnormally high barometric pressure exists, or will be above _____ inches of mercury, flight operations will not be authorized contrary to the requirements published in NOTAMs.
31.00
72
Some of the characteristics you would expect to see with an unstable air mass are
turbulence and good surface visibility.
73
Advection fog has drifted over a coastal airport during the day. What may tend to dissipate or lift this fog into low stratus clouds?
Wind 15 knots or stronger.
74
Low-level wind shear may occur when
there is a low-level temperature inversion with strong winds above the inversion.
75
Which would decrease the stability of an air mass?
Warming from below.
76
A strong wind shear can be expected
on the low-pressure side of a jetstream core where the speed at the core is stronger than 110 knots.
77
With respect to advection fog, which statement is true?
It can appear suddenly during day or night, and it is more persistent than radiation fog.
78
SIGMET's are issued as a warning of weather conditions which are hazardous
to all aircraft.