Challenge Questions PPL Sec 4.

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Challenge Questions PPL Sec 4.

Post  Admin on Wed Dec 02, 2009 8:02 am

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

Question: 3397 Subject Code: I24
What is meant by the term "dewpoint''?
A) The temperature to which air must be cooled to become saturated.
B) The temperature at which condensation and evaporation are equal.
C) The temperature at which dew will always form.

Question: 3398 Subject Code: I24
The amount of water vapor which air can hold depends on the
A) stability of the air.
B) dewpoint.
C) air temperature.

Question: 3399 Subject Code: I24
Clouds, fog, or dew will always form when
A) water vapor condenses.
B) relative humidity reaches 100 percent.
C) water vapor is present.

Question: 3400 Subject Code: I24
What are the processes by which moisture is added to unsaturated air?
A) Heating and condensation.
B) Evaporation and sublimation.
C) Supersaturation and evaporation.

Question: 3401 Subject Code: I24
Which conditions result in the formation of frost?
A) The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.
B) The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface.
C) The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface.

Question: 3402 Subject Code: I24
The presence of ice pellets at the surface is evidence that there
A) has been cold frontal passage.
B) is a temperature inversion with freezing rain at a higher altitude.
C) are thunderstorms in the area.

Question: 3403 Subject Code: I25
What measurement can be used to determine the stability of the atmosphere?
A) Atmospheric pressure.
B) Actual lapse rate.
C) Surface temperature.

Question: 3404 Subject Code: I25
What would decrease the stability of an air mass?
A) Warming from below.
B) Cooling from below.
C) Decrease in water vapor.

Question: 3405 Subject Code: I25
What is a characteristic of stable air?
A) Unlimited visibility.
B) Cumulus clouds.
C) Stratiform clouds.

Question: 3406 Subject Code: I25
Moist, stable air flowing upslope can be expected to
A) cause showers and thunderstorms.
B) develop convective turbulence.
C) produce stratus type clouds.

Question: 3407 Subject Code: I25
If an unstable air mass is forced upward, what type clouds can be expected?
A) Stratus clouds with little vertical development.
B) Stratus clouds with considerable associated turbulence.
C) Clouds with considerable vertical development and associated turbulence.

Question: 3408 Subject Code: I25
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.

Question: 3409 Subject Code: I25
What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70 °F and the dewpoint is 48 °F?
A) 5,000 feet MSL.
B) 4,000 feet MSL.
C) 6,000 feet MSL.

Question: 3410 Subject Code: I25
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 dewpoint is 38 °F?
A) 9,000 feet AGL.
B) 11,000 feet AGL.
C) 10,000 feet AGL.

Question: 3412 Subject Code: I25
What are characteristics of a moist, unstable air mass?
A) Cumuliform clouds and showery precipitation.
B) Stratiform clouds and showery precipitation.
C) Poor visibility and smooth air.

Question: 3413 Subject Code: I25
What are characteristics of unstable air?
A) Nimbostratus clouds and good surface visibility.
B) Turbulence and poor surface visibility.
C) Turbulence and good surface visibility.

Question: 3414 Subject Code: I25
A stable air mass is most likely to have which characteristic?
A) Smooth air.
B) Showery precipitation.
C) Turbulent air.

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