Aviation: Weather
3647. Over which area should a glider pilot expect to find the best lift under normal conditions (Figure 20) A-2 B- 7 C- 5
A- 2
3400. What are the processes by which moisture id added to unsaturated air? A- Evaporation and sublimation B- Heating and condensation C- Supersaturation and evaporation
A- Evaporation and sublimation
How does frost affect the lifting surfaces of an airplane on takeoff? A- Frost may prevent the airplane from becoming airborne at normal takeoff speed. B- Frost will change the camber of the wing, increasing lift during takeoff. C- Frost may cause the airplane to become airborne with a lower angle if attack at a lower indicated airspeed.
A- Frost may prevent the airplane from becoming airborne at normal takeoff speed.
How will frost on the wings of an airplane affect takeoff performance? A- Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability. B- Frost will change the camber of the wing, increasing its lifting capability. C- Frost will cause the airplane to become airborne with a higher angle if attack, decreasing the stall speed.
A- Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.
3436. What conditions are necessary for the formation of thunderstorms? A- high humidity, lifting force, and unstable conditions B- High humidity, high temperature, and cumulus clouds C- lifting force, moist air, and extensive cloud cover
A- High humidity, lifting force, and unstable conditions
3438. Thunderstorms reach their greatest intensity during the A- Mature stage B- downdraft stage C- cumulus stage
A- Mature stage
3350. What is the proper airspeed to use when flying between thermals on a cross country flight against headwind? A- The best lift/drag speed increased by one-half the estimated wind velocity B- The minimum sink speed increased by one-half estimated wind velocity C- The best lift/drag speed decreased by one-half the estimated wind velocity
A- The best lift/drag increased by one-half the estimated wind velocity
What situation is most conductive 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.
A- Warm, moist air over low, flatland areas on clear, calm nights.
3399. Clouds, fog, or dew will always form when A- Water vapor condenses B- Water vapor is present C- Relative humidity reached 100 percent
A- Water vapor condenses
3423. One weather phenomenon which will always occur when flying across a front is a change in A- Wind direction B- type of precipitation C- stability of the air mass
A- Wind direction
3422. 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
A- a change in temperature
3408. 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
A- a stable layer of air
3425. Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow A- across a mountain ridge and the air is stable B- Down a mountain valley, and the air is unstable C- parallel to a mountain peak and the air is stable
A- across a mountain ridge and the air is stable
2159. One of the most dangerous features of mountain waves is the turbulent areas in an A- below rotor clouds B- above rotor clouds C- below lenticular clouds
A- below rotor clouds
3412. 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
A- cumuliform clouds and showery precipitation
3452. Which weather phenomenon is always associated with a thunderstorm A- lightning B- heavy rain C- hail
A- lightening
3406- moist, stable air flowing upslope can be expected to A- produce stratus type clouds B- cause showers and thunderstorms C- develop convective turbulence
A- produce stratus type clouds
3385. Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high? A- smooth air, poor visibility, fog, haze, or low clouds B- light wind shear, poor visibility, haze, and light rain C- turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation
A- smooth air, poor visibility, fog, haze, or low clouds
3439. Thunderstorms generally produce the most intense hazard to aircraft are A- squall line thunderstorms B- steady state thunderstorms C- warm front thunderstorms
A- squall line thunderstorms
3405. What is a characteristic of stable air? A- stratiform clouds B- unlimited visibility C- cumulus clouds
A- stratiform cloud
3384. the most frequent type of ground or surface based temperature inversion is that which is produced by A- terrestrial radiation in a clear, relatively still night V- warm air being lifted rapidly aloft in the vicinity of mountanous terrain C- the movement of colder air under warm air, or the movement of warm air over cold air
A- terrestrial radiation in a clear, relatively still night
3435.which weather phenomenon signals the beginning of the mature stage of a thunderstorm A- the appearance of an anvil top B- Precipitation beginning to fall C- Maximum growth rate of the clouds
A- the appearance of an anvil top
3413. What are characteristics of unstable air? A- turbulence and good surface visibility B- turbulence and poor surface visibility 3- nimbostratus clouds and good surface visibility
A- turbulence and good surface visibility
3382. What causes variations in altimeter settings between weather reporting points A- Unequal heating of the Earths surface B- Variation of terrain elevation C- Coriolis force
A- unequal heating of the Earth's surface
3956. During a cross-country flight you picked up rime icing which you estimate is 1/2" thick on the leading edge of the wings. You are now below the clouds is more than 10 miles, winds at the destination airport are 8 knots right down the runway, and the surface temperature is 3°C. You decide to: A- use a faster than normal approach and landing speed. B- approach and land at your normal speed since the ice is not thick enough to have any noticeable effect. C- fly your approach slower than normal to lesson the "wind chill" effect and break up the ice.
A- use a faster than normal approach and landing speed.
3404. What would decrease the stability of an air mass? A- warming from below B- cooling from below C- decrease in water vapor
A- warming from below
2163. If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potential hazard exists due to
A- wind shear
3410. At approximatly 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 ft AGL B- 10,000 ft AGL C- 11,000 ft AGL
B- 10,000 ft AGL
3403. What measurement can be used to determine the stability of the atmosphere? A- Atmospheric pressure B- Actual lapse rate C- Surface temperature
B- Actual lapse rate
3398. The amount of water vapor which air can hold depends on the A- dewpoint B- Air temperature C- Stability of the air
B- Air Temperature
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.
B- An air mass moving inland from the coast in winter.
3395.The wind at 5,000 Ft. AGL is southwesterly while the surface wind is southerly. This difference in direction is primarily due to A- stronger pressure gradiant at higher altitudes B- Friction between the wind and the surface C- stronger Coriolis force at the surface
B- Friction between the wind and the surface
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.
B- The temperature of the collecting surface is at or below the dewpoint of the adjacent air and the dewpoint is below freezing.
3415. The suffix "nimbus" used in naming clouds, means A- a cloud extensive vertical development B- a rains cloud C- a middle cloud containing ice pellets
B- a rain cloud
3434. What feature is normally associated with the cumulus stage of a thunderstorm? A- roll cloud B- continuous updraft C- frequent lighting
B- continence updraft
3419. What clouds have the greatest turbulence? A- towering cumulus B- cumulonimbus C- nimbostratus
B- cumulonimbus
3437. During the life cycle of a thunderstorm, which stage is charecterized predominately by downdrafts? A- cumulus B- dissipating C- mature
B- dissipating
3416. Clouds are divided into four families according to their A- outwards shape B- height range C- Composition
B- height range
3427. When may hazardous wind shear be expected? A- when stable air crosses a contain barrier where it tends to flow in layers forming lenticular clouds
B- in areas of low-level temperature inversion, frontal zones, and clear air turbulence
3440. A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a A- prefrontal system B- squall line C- dry line
B- squall line
3418. 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
B- standing lenticular clouds
3521. The mature stage of a thunderstorm begins with A- formation of the anvil top B- the start of precipitation C- continuous downdrafts
B- the start of precipitation
3433. The conditions necessary for the formation of cumulonimbus clouds are a lifting action and A- unstable air containing an excess of condensation nuclei B- unstable, moist air C- either stable of unstable air
B- unstable, moist air
3441. if there is thunderstorm activity in the vicinity of an airport at which you can plan to land, which hazardous atmospheric phenomenon might be expected on the landing approach A- precipitation static B- wind shear turbulence C- steady rain
B- wind shear turbulence
3428. a pilot can expect a wind-shear zone in a temperature inversion whenever the windspeed at 2,000 to 4,000 feet above the surface is at least.
C- 25 knots
3409. What is the approximate base if the cumulus clouds if the surface air temperature at 1,000 ft MSL is 70°F and the dewpoint is 48°F A- 4,000 ft MSL B- 5,000 ft MSL C- 6,000 ft MSL
C- 6,000 ft MSL
Which is true with respect to a high- or low- pressure system? A- A high-pressure area or ridge is an area of rising air. B- A low-pressure area or tough is an area of descending air. C- A high-pressure area or ridge is an area of descending air.
C- A high-pressure area or ridge is a area of descending air.
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.
C- Advection fog and upslope fog.
3383. A temperature inversions would most likely result in which weather condition? A- Clouds with extensive vertical development above an inversions 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
C- An increase in temperature as altitude is increased
3451- During which period is sea breeze front most suitable for soaring flight? A- Shortly after sunrise B- during the early forenoon C- During the afternoon
C- During the afternoon
During which period is a sea breeze front most suitable for soaring flight? A- Shortly after sunrise. B- During the middle of the morning. C- During the afternoon.
C- During the afternoon.
3444. 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
C- Fog or low clouds
3430. In which environment is aircraft structural ice most likely to have the highest accumulation rate?
C- Freezing Rain
Why is frost considered hazardous to flight? A- Frost changes the basic aerodynamic shape of the airfoils, thereby increasing lift. B- Frost slows the airflow over the airfoils, thereby increasing control effectiveness. C- Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability.
C- Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability
3381. Every Physical Process of weather is accompanied by, or is the result of, a A- Movement of Air B- Pressure Differential C- Heat Exchange
C- Heat Exchange
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 D- Skye you are BEAUTIFUL
C- Steam Fog.
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.
C- Steam Fog.
3417. An almond or lens shapes cloud which appears stationary, but which may contain wind of 50 knots or more is referred to as A- an inactive formal cloud B- a funnel cloud C- a lenticular cloud
C- a lenticular lens
3426. where does wind shear occur A- only at higher altitudes B- only at lower altitudes C- at all altitudes, in all direction
C- at all altitudes, in all directions
3407. 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
C- clouds with considerable vertical development ans associated turbulence
2369. Moisture is added to air by A- sublimation and condensation B- evaporation and condensation C- evaporation and sublimation
C- evaporation and sublimation
3402. The presence of ice pellets at the surface is evidence that three
C- is a temperature inversion with freezing rain at a higher altitude
3442. upon encountering severe turbulence, which flight condition should the pilot attempt to maintain? A- constant altitude and airspeed B- Constant angle of attack C- level flight attitude
C- level flight attitude
3414. A stable air mass is most likely to have which characteristic? A- showers precipitation B- turbulent air C- poor surface visibility
C- poor surface visibility
3448. The development of thermals depends upon A- a counterclockwise circulation of air B- temperature inversions C- solar heating
C- solar heating
3424. Steady precipitation preceding a front is an indication of A- stratiform clouds with moderate turbulence B- cumliform clouds with little or no turbulence C- stratiform clouds with little or no turbulence
C- stratiform clouds with little or no turbulence
3397. 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
C- the temperature to which air must be cooled to become saturated
3420. What cloud types would indicate convective turbulence? A- Cirrus Clouds B- Nimbostratus Clouds C- Towering cumulus clouds
C- towering cumulus clouds
3429. One in-flight condition necessary for structural icing to form is
C- visible moisture
3449. Which is considered to be the most hazardous condition when soaring in the vicinity of thunderstorm? A- static electricity B- lightening C- wind shear and turbulence
C- wind shear turbulence
