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C X
A clear area in a line of thunderstorm echoes on a radar scope
indicates
A. the absence of clouds in the area
B. an area of no convective turbulence
C. an area where precipitation drops are not detected
C X
Airplanes may encounter heavy turbulence in
A. Cumulonimbus and towering cumulus
B. Stratocumulus and altocumulus
C. Altocumulus and cumulonimbus
A X
An aircraft that encounters a headwind of 40 knots, within
a microburst, may expect a total shear across the microburst
of
A. 40 knots
B. 80 knots
C. 90 knots
B X
An aircraft that encounters a headwind of 45knots, within a
microburst, may expect a total shear across the microburst
of
A. 40 knots
B. 80 knots
C. 90 knots
C X
At lower levels of the atmosphere, friction causes the wind
to flow across isobars into a low because the friction.
A. decreases windspeed and Coriolis force.
B. decreases pressure gradient force.
C. creates air turbulence and raises atmospheric pressure.
A X
At which location does Coriolis force have the least effect
on wind direction?
A. At the poles.
B. Middle latitudes(30o to 60o).
C. At the equator.
C X
before takeoff, the pilots find the clouds have the following:
very low and thick clouds, flat and gray bottoms with light
rain. Thisclouds is referred as
A. stratus or nimbostratus
B. altostratus or stratocumulus
C. cumulonimbus or altocumulus
A X
Before taking off, the captain finds that on weather map, a
stable cold front is slowly moving towards his arrival
airport,
A.(接正文he should predict that the weather at the arrival
airport might be) cloudy with drizzle, low clouds and weak
turbulent current
B. cumulonimbus clouds, shower and gale
C. clear after rain, north deflecting wind and strong
turbulent current
A X
Convective clouds which penetrate a stratus layer can produce
which threat to instrument flight?
A. freezing rain
B. clear air turbulence
C. embedded thunderstorms
C X
During the life cycle of a thunderstorm, which stage is
characterized predominately by downdrafts?
A. cumulus
B. dissipating
C. mature
B X
How are smoke cleared or dispersed?
A. By wind or the movement of air.
B. By convective mixing in cool night air.
C. By evaporation similar to the clearing of fog.
A X
How can the stability of the atmosphere be determined?
A. Ambient temperature lapse rate.
B. Atmospheric pressure at various levels.
C. Surface temperature/dewpoint spread.
A X
How can turbulent air cause an increase in stalling speed of
an airfoil?
A.An abrupt change in relative wind.
B.A decrease in angle of attack.
C.Sudden decrease in load factor.
A X
How does Coriolis force affect wind direction in the Southern
Hemisphere.
A. Causes clockwise rotation around a low.
B. Causes wind to flow out of a low toward a high.
C. Has exactly the same effect as in the Northern Hemisphere.
A X
How dose Coriolis affect wind direction in the northern
Hemisphere?
A. Causes counterclockwise rotation around a low.
B. Causes wind to flow out of a low toward a high.
C. Has exactly the same effect as in the Southern Hemisphere.
A X
If airplane enters to the undershoot airflow under
thunderstorm clouds, it will encounter___.
A. head windshear
B. turbulence
C. vertical windshear
C X
If the aircraft enters the strong downdraft burst, where is
the aircraft expected to meet the strongest downdraft?
A. in the center of strong downdraft burst
B. when it enters the strong downdraft burst
C. when leaves the strong downdraft burst
A X
If the airplane flies through a high pressure center in the
northern hemisphere, the wind direction usually changes.
A. from headwind to tailwind.
B. from left crosswind to right crosswind.
C. from right crosswind to left crosswind
C X
If the airplane fly through a low pressure center in the
northern hemisphere, the wind direction usually changes .
A.from left crosswind to right crosswind.
B.from headwind to tailwind.
C.from right crosswind to left crosswind
A X
If the ambient temperature is colder than standard at FL310,
what is the relationship between true altitude and pressure
altitude?
A.They are both the same 31,000feet.
B.True altitude is lower than 31,000feet.
C.Pressure altitude is lower than true altitude.
B X
If the ambient temperature is warmer than standard at FL350,
what is the density altitude compared to pressure altitude?
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