361. I22 PVT Which factor would tend to increase the density altitude at a given airport? A) An increase in barometric pressure. B) An increase in ambient temperature. C) A decrease in relative humidity. 362. H951 PVT What are the standard temperature and pressure values for sea level? A) 15 �‹C and 29.92 inches Hg. B) 59 �‹C and 1013.2 millibars. C) 59 �‹F and 29.92 millibars. 363. I22 PVT Under which condition will pressure altitude be equal to true altitude? A) When the atmospheric pressure is 29.92 inches Hg. B) When standard atmospheric conditions exist. C) When indicated altitude is equal to the pressure altitude. 364. I22 PVT Under what condition is pressure altitude and density altitude the same value? A) At sea level, when the temperature is 0 �‹F. B) When the altimeter has no installation error. C) At standard temperature. 365. I22 PVT If a flight is made from an area of low pressure into an area of high pressure without the altimeter setting being adjusted, the altimeter will indicate A) the actual altitude above sea level. B) higher than the actual altitude above sea level. C) lower than the actual altitude above sea level. 366. I22 PVT Under what condition will true altitude be lower than indicated altitude? A) In colder than standard air temperature. B) In warmer than standard air temperature. C) When density altitude is higher than indicated altitude. 367. I25 PVT 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) 4,000 feet MSL. B) 5,000 feet MSL. C) 6,000 feet MSL. 368. I25 PVT What are characteristics of a moist, unstable air mass? A) Cumuliform clouds and showery precipitation. B) Poor visibility and smooth air. C) Stratiform clouds and showery precipitation. 369. I25 PVT What are characteristics of unstable air? A) Turbulence and good surface visibility. B) Turbulence and poor surface visibility. C) Nimbostratus clouds and good surface visibility. 370. H955 PVT A stable air mass is most likely to have which characteristic? A) Showery precipitation. B) Turbulent air. C) Poor surface visibility. 371. I25 PVT Moist, stable air flowing upslope can be expected to A) produce stratus type clouds. B) cause showers and thunderstorms. C) develop convective turbulence. 372. I25 PVT 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. 373. I25 PVT 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. 374. I25 PVT What measurement can be used to determine the stability of the atmosphere? A) Atmospheric pressure. B) Actual lapse rate. C) Surface temperature. 375. I25 PVT What would decrease the stability of an air mass? A) Warming from below. B) Cooling from below. C) Decrease in water vapor. 376. I25 PVT What is a characteristic of stable air? A) Stratiform clouds. B) Unlimited visibility. C) Cumulus clouds. 377. I21 PVT Every physical process of weather is accompanied by, or is the result of, a A) movement of air. B) pressure differential. C) heat exchange. 378. I21 PVT What causes variations in altimeter settings between weather reporting points? A) Unequal heating of the Earth's surface. B) Variation of terrain elevation. C) Coriolis force. 379. I21 PVT A temperature inversion would most likely result in which weather condition? A) Clouds with extensive vertical development above an inversion aloft. B) Good visibility in the lower levels of the atmosphere and poor visibility above an inversion aloft. C) An increase in temperature as altitude is increased. 380. I21 PVT The most frequent type of ground or surface-based temperature inversion is that which is produced by A) terrestrial radiation on a clear, relatively still night. B) warm air being lifted rapidly aloft in the vicinity of mountainous terrain. C) the movement of colder air under warm air, or the movement of warm air over cold air.

RETURN