Questões ATP_pag334

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Frost forms when both the temperature and the dewpoint of the collecting surface are
below freezing. When this occurs, water vapor sublimates directly into frost. This
condition most often occurs on clear nights with little or no wind.
Answer (A) is incorrect because moisture that falls on a collecting surface that is at or
below freezing will form ice. Answer (B) is incorrect because frozen dew is hard and
transparent, while frost is the sublimation of vapor into ice, and is white and opaque.
1136. What temperature condition is indicated if precipitation in the form of wet snow occurs
during flight?
 A. The temperature is above freezing at flight altitude.
 B. The temperature is above freezing at higher altitudes.
 C. There is an inversion with colder air below.
Snowflakes are formed by sublimation in below-freezing temperatures. If the snow
falls into an area of above-freezing temperatures it will start to melt, become wet snow
and eventually turn into rain.
Answer (B) is incorrect because wet snow indicates above-freezing temperature at
flight level, not at higher altitudes. The temperature was below freezing at the altitudes
where the snow formed. Answer (C) is incorrect because wet snow indicates falling
snow that has begun to melt due to above-freezing temperature at flight level. An
inversion may or may not be the cause of the warmer air.
1137. The practice developed and accepted by the North American air carrier industry using
traditional North American fluids is to ensure that the freeze point of the remaining film
is below ambient temperature by at least
 A. 10°F.
 B. 20°F.
 C. 20°C.
As it is applied, deicing fluid is often diluted by melted snow and ice. It is standard
practice to ensure that the remaining film of diluted fluid has a freeze point at least
20°F below the ambient temperature.
1138. (Refer to Figure 145.) What type of report is listed for Lubbock (KLBB) at 1818Z?
 A. An Aviation selected special weather report.
 B. A special report concerning very low station pressure.
 C. A Special METAR weather observation, concerning significant weather changes.
The designation 'SPECI' means that this is a special weather observation.
1139. Temperature and radiation variations over land with a clear sky typically lead to
 A. minimum temperature occurring after sunrise.
 B. incoming terrestrial radiation peaking at noon.