ASA Private Pilot 2020 Test Prep
(Chapter 6)
✅✅
Every physical process of weather is accompanied by, or is the result of,
a- -heat exchange
✅✅
What causes variations in altimeter settings between weather reporting
points? - -Unequal heating of the Earth's surface
✅✅
The wind at 5,000 feet AGL is southwesterly while the surface wind is
southerly. This difference in direction is primarily due to - -friction
between the wind and the surface
✅✅
Convective circulation patterns associated with sea breezes are caused
by - -cool, dense air moving inland from over the water
✅✅
When there is a temperature inversion, you would expect to experience -
-an increase in temperature as altitude increases
✅✅
The most frequent type of ground or surface-based temperature
inversion is that which is produced by - -terrestrial radiation on a
clear, relatively still night
✅✅
What are the processes by which moisture is added to unsaturated air? -
-Evaporation and sublimation
If the temperature/dewpoint spread is small and decreasing, and the
✅✅
temperature is 62 degrees F, what type of weather is most likely
developing - -Fog or low clouds
✅✅
One of the most easily recognized discontinuities across a front is -
-a change in temperature
✅✅
One weather phenomenon which will always occur when flying across a
front is a change in the - -wind direction
, 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
✅✅
What measurement can be used to determine the stability of the
atmosphere? - -Actual lapse rate
What would decrease the stability of an air mass? - ✅✅-Warming from
below
✅✅-Stratiform clouds
What is a characteristic of stable air? -
What feature is associated with a temperature inversion? - ✅✅-A
stable layer of air
✅✅
What are characteristics of a moist, unstable air mass? -
-Cumuliform clouds and showery precipitation
What are characteristics of unstable air? - ✅✅-Turbulence and good
surface visibility.
✅✅
A stable air mass is most likely to have which characteristic? -
-Poor surface visibility
When warm, moist, stable air flows upslope, it - ✅✅-produces stratus
type clouds
✅✅
If an unstable air mass is forced upward, what type clouds can be
expected? - -clouds with considerable vertical development and
associated turbulence
✅✅
Steady precipitation preceding a front is an indication of -
-stratiform clouds with little or no turbulence
✅✅
The conditions necessary for the formation of cumulonimbus clouds are
a lifting action and - -unstable, moist air
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