341 I26 PVT An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as A) an inactive frontal cloud. B) a funnel cloud. C) a lenticular cloud. 342 I26 PVT Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as A) mammatocumulus clouds. B) standing lenticular clouds. C) roll clouds. 343 I26 PVT What cloud types would indicate convective turbulence? A) Cirrus clouds. B) Nimbostratus clouds. C) Towering cumulus clouds. 344 I26 PVT What clouds have the greatest turbulence? A) Towering cumulus. B) Cumulonimbus. C) Nimbostratus. 345 I31 PVT What situation is most conducive to the formation of radiation fog? A) Warm, moist air over low, flatland areas on clear, calm nights. B) Moist, tropical air moving over cold, offshore water. C) The movement of cold air over much warmer water. 346 I31 PVT If the temperature/dewpoint spread is small and decreasing, and the temperature is 62 �‹F, what type weather is most likely to develop? A) Freezing precipitation. B) Thunderstorms. C) Fog or low clouds. 347 I31 PVT In which situation is advection fog most likely to form? A) A warm, moist air mass on the windward side of mountains. B) An air mass moving inland from the coast in winter. C) A light breeze blowing colder air out to sea. 348 I31 PVT 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. 349 I27 PVT One of the most easily recognized discontinuities across a front is A) a change in temperature. B) an increase in cloud coverage. C) an increase in relative humidity. 350 I27 PVT One weather phenomenon which will always occur when flying across a front is a change in the A) wind direction. B) type of precipitation. C) stability of the air mass. 351 I27 PVT Steady precipitation preceding a front is an indication of A) stratiform clouds with moderate turbulence. B) cumuliform clouds with little or no turbulence. C) stratiform clouds with little or no turbulence. 352 I29 PVT One in-flight condition necessary for structural icing to form is A) small temperature/dewpoint spread. B) stratiform clouds. C) visible moisture. 353 I29 PVT In which environment is aircraft structural ice most likely to have the highest accumulation rate? A) Cumulus clouds with below freezing temperatures. B) Freezing drizzle. C) Freezing rain. 354 I33 PVT 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. 355 I24 PVT What is meant by the term 'dewpoint'? A) The temperature at which condensation and evaporation are equal. B) The temperature at which dew will always form. C) The temperature to which air must be cooled to become saturated. 356 I24 PVT The amount of water vapor which air can hold depends on the A) dewpoint. B) air temperature. C) stability of the air. 357 I24 PVT Clouds, fog, or dew will always form when A) water vapor condenses. B) water vapor is present. C) relative humidity reaches 100 percent. 358 I24 PVT What are the processes by which moisture is added to unsaturated air? A) Evaporation and sublimation. B) Heating and condensation. C) Supersaturation and evaporation. 359 I24 PVT Which conditions result in the formation of frost? A) The temperature of the collecting surface is at or below freezing when small droplets of moisture fall on the surface. B) The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing. C) The temperature of the surrounding air is at or below freezing when small drops of moisture fall on the collecting surface. 360 I24 PVT The presence of ice pellets at the surface is evidence that there A) are thunderstorms in the area. B) has been cold frontal passage. C) is a temperature inversion with freezing rain at a higher altitude.

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