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43..When warm wet airflow flows to the cold ground, it will
usually produce .
A. layer clouds
B. smooth airflow and advection fog
C. warm front clouds
B X
44..Where can the maximum hazard zone caused by wind shear
associated with a thunderstorm be found?
A. in front of the thunderstorm cell (anvil side) and on the
southwest side of the cell.
B.. ahead of the roll cloud or gust front and directly under
the anvil cloud.
C. on all sides and directly under the thunderstorm cell.
C X
45..Where do squall lines most often develop?
A.in an occluded front
B.ahead of a cold front
C.behind a stationary front
B X
46..Which condition is present when a local of air is stable?
A. The parcel of air resists convection.
B. The parcel of cannot be forced uphill.
C. As the parcel of air moves upward, its temperature becomes
warmer than the surrounding air.
A X
47..Which condition will for the formation of advection fog?
A. Moist, stable air being moved over gradually rising ground
by a wind
B. A clear sky, little or no wind, and high relative humidity.
C. Moist air moves over colder ground or water.
C X
48..Which is a necessary condition for the occurrence of a
low-level temperature inversion wind shear?
A.the temperature differential between the cold and warm
layers must be at least 10℃.
B.a calm or light wind near the surface and a relatively strong
wind just above the inversion.
C.a wind direction difference of at least 30℃ between the
wind near the surface and the wind just above the inversion.
B X
49..Which of the following area has the highest probability
to produce low level windshear?
A.Area with strong cold advection
B.Area where the sea and the land meet
C. Area near the front with thunderstorms
C X
50..Which of the following cases illustrates airplane's entry
one type of air mass to another one?
A. The airplane flies through high level turbulence
B. Obvious change of temperature and wind direction within
a short period of time
C. The airplane meets rolling airflow when crossing
mountainous areas
B X
51..Which of the following cases provides impulse force for
forming heat thunderstorm?
A. Water vapor coagulating and then releasing latent heat
B. Rising terrain
C. Uneven heat on the ground
C X
52..Which of the following characteristics heat
thunderstorm?
A.It moves with the weather system.
B.It covers small area and is isolated with openings
C. It strengthens at night and weakens in the day on land
B X
53..Which of the following differs most greatly at the two
sides of the front?
A.wind speed
B.air temperature
C.air pressure
B X
54..Which INITIAL cockpit indications should a pilot be aware
of when a headwind shears to a calm wind?
A. indicated airspeed decreases, aircraft pitches up, and
altitude decreases
B. indicated airspeed increases, aircraft pitches down, and
altitude increases
C. indicated airspeed decreases, aircraft pitches down, and
altitude decreases
C X
55..which of the following statements about "hailstone" is
correct?
A.ground rain means that the hailstone disappears in the air
B.towering clouds usually produce hailstones
C.the hail can be thrown several kilometers out of the
thunderstorm.
C X
56..Which of the following weather phenomenon symbols that
thunderstorm is at its mature phase?
A. The appearance of disordered low clouds
B. The appearance of anvil clouds top
C. It begins to rain on the ground
C X
57..Which process causes adiabatic cooling?
A. Expansion of air as rises.
B. Movement of air over a colder surface.
C. Release of latent heat during the vaporization process.
A X
58..Which term applies when the temperature of the air changes
by compression or expansion with no heat added or removed?
A. Katabatic.
B. Advection.
C. Adiabatic.
C X
59..Which type clouds are indicative of very strong
turbulence?
A. nimbostratus.
B. Standing lenticular.
C. Cirrocumulus.
B X
60..Which type of weather conditions are covered in the
Convective SIGMET
A. Embedded thunderstorms, severe turbulence
B. Cumulonimbus clouds, light turbulence
C. severe icing, surface visibility lower than 5000 meters
A X
61..Which type precipitation is an indication that
supercooled water is present?
A. wet snow.
B. Freezing rain.
C. Ice pellets.
B X
62..Which types of weather conditions are covered in the
　
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