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DRONE 107

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What would decrease the stability of an air mass?

A. Warming from below.
B. Cooling from below.
C. Decrease in water vapor.

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Terms in this set (232)

What would decrease the stability of an air mass?

A. Warming from below.
B. Cooling from below.
C. Decrease in water vapor.

A. Warming from below.

The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to

A. stronger pressure gradient at higher altitudes.
B. friction between the wind and the surface.
C. stronger Coriolis force at the surface.

B. friction between the wind and the surface.

3. Clouds are divided into four families according to their

A. outward shape.
B. height range.
C. composition.

B. height range.

Low-level turbulence can occur and icing can become hazardous in which type of fog?

A. Rain-induced fog.
B. Upslope fog.
C. Steam fog.

What feature is associated with a temperature inversion?

A. A stable layer of air.
B. An unstable layer of air.
C. Chinook winds on mountain slopes.

A. A stable layer of air.

What types of fog depend upon wind in order to exist?

A. Radiation fog and ice fog.
B. Steam fog and ground fog.
C. Advection fog and upslope fog.

C. Advection fog and upslope fog.

A stable air mass is most likely to have which characteristic?

A. Showery precipitation.
B. Turbulent air.
C. Smooth air.

What are the processes by which moisture is added to unsaturated air?

A. Evaporation and sublimation.
B. Heating and condensation.
C. Supersaturation and evaporation.

A. Evaporation and sublimation.

If there is thunderstorm activity in the vicinity of an airport at which you plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach?

A. Precipitation static.
B. Wind-shear turbulence.
C. Steady rain.

B. Wind-shear turbulence.

Where does wind shear occur?

A. Only at higher altitudes.
B. Only at lower altitudes.
C. At all altitudes, in all directions.

C. At all altitudes, in all directions.

What causes variations in altimeter settings between weather reporting points?

A. Unequal heating of the Earth's surface.
B. Variation of terrain elevation.
C. Coriolis force.

A. Unequal heating of the Earth's surface.

What are the characteristics of stable air?

A. Good visibility and steady precipitation.
B. Poor visibility and steady precipitation.
C. Poor visibility and intermittent precipitation.

B. Poor visibility and steady precipitation.

A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is a known as a

A. prefrontal system.
B. squall line.
C. dry line.

B. squall line.

For aviation purposes, ceiling is defined as the height above the Earth's surface of the

A. lowest reported obscuration and the highest layer of clouds reported as overcast.
B. lowest broken or overcast layer or vertical visibility into an obscuration.
C. lowest layer of clouds reported as scattered, broken, or thin.

B. lowest broken or overcast layer or vertical visibility into an obscuration.

What feature is normally associated with the cumulus stage of a thunderstorm?

A. Roll cloud.
B. Continuous updraft.
C. Frequent lightning.

B. Continuous updraft.