How air-brained are you? Test your general aviation knowledge on matters including safety, history, training or anything related to flying! Compiled by James Allan
Explanations to some of the questions can be found below the quiz – no cheating!
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3 b As air rises, it expands in the lowering air pressure, cools and thus reduces its ability to hold moisture. When the moisture in the air exceeds the amount that air mass can hold (the dew point) the water condenses, forming cloud. The average rate at which air cools as it rises is 3o C per 1,000ft. The dew point also decreases at about 0.5o C per 1,000ft. Thus the spread between the air temperature and dew point decreases by 2.5 o C per 1,000ft. Based on this, the ‘Rule of Thumb’ to work out cloud base in feet is: (surface air temperature – dew point temperature) x 400 = height of cloud base agl
9 c For electromagnetic waves: wavelength x frequency = 299,792 km/sec (the speed of light)
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