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referred to as .
A.plume
B.virga
C. dowdraft
B X
26..Turbulence encountered above 15,000 feet AGL, not
associated with cloud formations, should be reported as
A. convective turbulence.
B. High altitude turbulence.
C. Clear air turbulence.
C X
27..What action is appropriate when encountering the first
ripple of reported clear air turbulence (CAT)?
A.Extend flaps to decrease wing loading.
B.Extend gear to provide more drag and increase stability.
C.Adjust airspeed to that recommended for rough air.
C X
28..What airport condition is reported by the tower when more
than one wind condition at different positions on the airport
is reported?
A. Light and variable.
B. Wind shear.
C. Frontal passage.
B X
29..What characterizes a ground-based inversion?
A. Convection currents at the surface.
B. Cold temperatures.
C. Poor visibility.
C X
30..What condition is necessary for the formation of
structural icing in flight?
A. flying in any clouds.
B. Flying in rain.
C. the temperature of the aircraft surface is 0oC or colder
and supercooled water drops.
C X
31..What condition produces the most frequent type of
ground-or surface-based temperature inversion?
A. The movement of colder air under warm air or the movement
of warm air over cold air.
B. Widespread sinking of air within a thick layer aloft
resulting in heating by compression.
C. Terrestrial radiation on a clear, relatively calm night.
C X
32..What is a characteristic of the troposphere?
A. It contains all the moisture of the atmosphere.
B. There is an overall decrease of temperature with an
increase of altitude.
C. The average altitude of the top of the troposphere is about
6 miles.
B X
33..What is a feature of supercooled water?
A. the water drop sublimates to an ice particle upon impact.
B. The unstable water drop freezes upon striking an exposed
object.
C. The temperature of the water drop remains at 0℃ until it
impacts a part of the airframe, then clear ice accumulates.
B X
34..What is a likely location of clear air turbulences?
A. in an upper trough on the polar side of a jetstream.
B. Near a ridge aloft on the equatorial side of a high pressure
flow.
C. Downstream of the equatorial side of a jetstream.
A X
35..What is an important characteristic of wind shear?
A. it is primarily associated with the lateral vortices
generated by thunderstorms.
B. it usually exists only in the vicinity of thunderstorms,
but may be found near a strong temperature inversion.
C. it may be associated with either a wind shift or a wind
speed gradient at any level in the atmosphere.
C X
36..What is the expected duration of an individual
microburst?
A. two minutes with maximum winds lasting approximately 1
minute.
B. one microburst may continue for as long as 2to 4 hours.
C. seldom longer than 15 minutes from the time the burst
strikes the ground until dissipation.
C X
37..What is the lowest cloud in the stationary group
associated with a mountain wave?
A. rotor cloud.
B. Standing lenticular.
C. Low stratus.
B X
38..What temperature condition is indicated if precipitation
in the form of wet snow occurs during flight?
A. the temperature is above freezing at flight altitude.
B. The temperature is above freezing at higher altitudes.
C. There is an inversion with colder air below.
A X
39..What wind condition prolongs the hazards of wake
turbulence on a landing runway for the longest period of time?
A. Direct tailwind.
B. Light quartering tailwind.
C. Light quartering headwind.
B X
40..When advection fog has developed, what may tend to
dissipate or lift the fog into low stratus clouds?
A. Temperature inversion.
B. Wind stronger than 15 konts.
C. Surface radiation.
B X
41..When flying over the nimbostratus clouds, the pilot finds
that there are uptowering clouds on the thick layer. Top of
the towering clouds extends to 9000 meters high and are blown
to one side by the strong wind like horse's mane.
A.(接正文Based on this situation, he predicts that there must
be__in the sheet clouds.) cumulonimbus clouds
B. altocumulus clouds
C. false cirrus clouds
A X
42..When takeoff or landing at the airport on the edge of
thunderstorm region, which of the following descriptive
weather should be watchouted particularly?
A. visibility and low clouds
B. windshear at low altitude
C. hail and rainstorm
B X
　
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