WorksheetsPPLGS Module 6
Total questions: 30
Worksheet time: 15mins
How will frost on the wings of an airplane affect takeoff performance?
Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.
Frost will change the camber of the wing, increasing its lifting capability.
Frost will cause the airplane to become airborne with a higher angle of attack, decreasing the stall speed.
Every physical process of weather is accompanied by, or is the result of, a
movement of air.
pressure differential.
heat exchange.
What causes variations in altimeter settings between weather reporting points?
Unequal heating of the Earth's surface.
Variation of terrain elevation.
Coriolis force.
When there is a temperature inversion, you would expect to experience
clouds with extensive vertical development above an inversion aloft.
good visibility in the lower levels of the atmosphere and poor visibility above an inversion aloft.
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.
warm air being lifted rapidly aloft in the vicinity of mountainous terrain.
the movement of colder air under warm air, or the movement of warm air over cold air.
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.
Light wind shear, poor visibility, haze, and light rain.
Turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation.
The wind at 5,000 feet AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to
stronger pressure gradient at higher altitudes.
friction between the wind and the surface.
stronger Coriolis force at the surface.
What is meant by the term dew point?
The temperature at which condensation and evaporation are equal.
The temperature at which dew will always form.
The temperature to which air must be cooled to become saturated.
The amount of water vapor which air can hold depends on the
dew point.
air temperature.
stability of the air.
Clouds, fog, or dew will always form when
water vapor condenses.
water vapor is present.
relative humidity reaches 100 percent.
What are the processes by which moisture is added to unsaturated air?
Evaporation and sublimation.
Heating and condensation.
Supersaturation and evaporation.
Which conditions result in the formation of frost?
The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface.
The temperature of the collecting surface is at or below the dew point of the adjacent air and the dew point is below freezing.
The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface.
The presence of ice pellets at the surface is evidence that there
are thunderstorms in the area.
has been cold frontal passage.
is a temperature inversion with freezing rain at a higher altitude.
What measurement can be used to determine the stability of the atmosphere?
Atmospheric pressure.
Actual lapse rate.
Surface temperature.
What would decrease the stability of an air mass?
Warming from below.
Cooling from below.
Decrease in water vapor.
What is a characteristic of stable air?
Stratiform clouds.
Unlimited visibility.
Cumulus clouds.
When warm, moist, stable air flows upslope, it
produces stratus type clouds.
causes showers and thunderstorms.
develops convective turbulence.
If an unstable air mass is forced upward, what type clouds can be expected?
Stratus clouds with little vertical development.
Stratus clouds with considerable associated turbulence.
Clouds with considerable vertical development and associated turbulence.
What feature is associated with a temperature inversion?
A stable layer of air.
An unstable layer of air.
Chinook winds on mountain slopes.
What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70°F and the dew point is 48°F?
4,000 feet MSL.
5,000 feet MSL.
6,000 feet MSL.
At approximately what altitude above the surface would the pilot expect the base of cumuliform clouds if the surface air temperature is 82°F and the dew point is 38°F?
9,000 feet AGL.
10,000 feet AGL.
11,000 feet AGL.
What are characteristics of a moist, unstable air mass?
Cumuliform clouds and showery precipitation.
Poor visibility and smooth air.
Stratiform clouds and showery precipitation.
What are characteristics of unstable air?
Turbulence and good surface visibility.
Turbulence and poor surface visibility.
Nimbostratus clouds and good surface visibility.
A stable air mass is most likely to have which characteristic?
Showery precipitation.
Turbulent air.
Poor surface visibility.
The suffix 'nimbus,' used in naming clouds, means
a cloud with extensive vertical development.
a rain cloud.
a middle cloud containing ice pellets.
Clouds are divided into four families according to their
outward shape.
height range.
composition.
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
an inactive frontal cloud.
a funnel cloud.
a lenticular cloud.
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
mammatocumulus clouds.
standing lenticular clouds.
roll clouds.
What clouds have the greatest turbulence?
Towering cumulus.
Cumulonimbus.
Nimbostratus.
What cloud types would indicate convective turbulence?
Cirrus clouds.
Nimbostratus clouds.
Towering cumulus clouds.
