5579092
Questão 1
Questão
What is a characteristic of the troposphere?
Responda
-
It contains all the moisture of the atmosphere
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There is an overall decrease of temperature with an increase of altitude
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The average altitude of the top of the troposphere is about 6 miles
Questão 2
Questão
What is the primary cause of all changes in the Earth's weather?
Responda
-
Variations of solar energy at the Earth's surface
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Changes in air pressure over the Earth's surface
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Movement of air masses from moist areas to dry areas
Questão 3
Questão
What characterizes a ground-based inversion?
Responda
-
Convection currents at the surface
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Cold temperatures
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Poor visibility
Questão 4
Questão
What feature is associated with a temperature inversion?
Responda
-
A stable layer of air
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An unstable layer of air
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Air mass thunderstorms
Questão 5
Questão
When does minimum temperature normally occur during a 24-hour period?
Responda
-
After sunrise
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About 1 hour before sunrise
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At midnight
Questão 6
Questão
Which area or areas of the Northern Hemisphere experience a generally east to west movement of weather systems?
Responda
-
Artic only
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Artic and subtropical
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Subtropical only
Questão 7
Questão
At lower levels of the atmosphere, friction causes the wind to flow across isobars into a low because the friction:
Responda
-
Decreases windspeed and Coriolis force
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Decreases pressure gradient force
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Creates air turbulence and raises atmospheric pressure
Questão 8
Questão
Which type wind flows down slope becoming warmer and dryer?
Responda
-
Land breeze
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Valley wind
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Katabatic wind
Questão 9
Questão
What is a feature of air movement in a high pressure area?
Responda
-
Ascending from the surface high to lower pressure at higher altitudes
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Descending to the surface and then outward
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Moving outward from the high at high altitudes and into the high at the surface
Questão 10
Questão
Where is the usual location of a thermal low?
Responda
-
Over the artic region
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Over the eye of a hurricane
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Over the surface of a dry, sunny region
Questão 11
Questão
Freezing rain encountered during a climb is normally evidence that:
Responda
-
A climb can be made to a higher altitude without encountering more than light icing
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A layer of warmer air exists above
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Ice pellets at higher altitudes have changed to rain in the warmer air below
Questão 12
Questão
What temperature condition is indicated if precipitation in the form of wet snow occurs during flight?
Responda
-
The temperature is above freezing at flight altitude
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The temperature is above freezing at higher altitudes
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There is an inversion with colder air below
Questão 13
Questão
What term describes an elongated area of low pressure?
Responda
-
Trough
-
Ridge
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Hurricane or typhon
Questão 14
Questão
What is an important characteristic of wind shear?
Responda
-
It is primarily associated with the lateral vortices generated by thunderstorms
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It usually exist only in the vicinity of thunderstorms, but may be found near a strong temperature inversion
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It may be associated with either a wind shift or a wind speed gradient at any level in the atmosphere
Questão 15
Questão
What information from the control tower is indicated by the following transmission?
"SOUTH BOUNDARY WIND ONE SIX ZERO AT TWO FIVE, WEST BOUNDARY WIND TWO FOUR ZERO AT THREE FIVE"
Responda
-
A downburst is located at the center of the airport
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Wake turbulence exists on the west side of the active runway
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There is a possibility of wind shear over or near the airport
Questão 16
Questão
Where is a common location for an inversion?
Responda
-
At the tropopause
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In the stratosphere
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At the base of cumulus clouds
Questão 17
Questão
What condition produces the most frequent type of ground or surface based temperature inversion?
Responda
-
The movement of colder air under warm air or the movement of warm air over cold air
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Widespread sinking of air within a thick layer aloft resulting in heating by compression
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Terrestrial radiation on a clear, relatively calm night
Questão 18
Questão
Which term applies when the temperature of the air changes by compression or expansion with no heat added or removed?
Responda
-
Katabatic
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Advection
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Adiabatic
Questão 19
Questão
What is the approximate rate unsaturated air will cool flowing upslope?
Responda
-
3 degrees per 1,000 feet
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2 degrees per 1,000 feet
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4 degrees per 1,000 feet
Questão 20
Questão
Isobars on a surface weather chart represent lines of equal pressure:
Responda
-
At the surface
-
Reduced to sea level
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At a given atmospheric pressure altitude
Questão 21
Questão
At which location does Coriolis force have the least effect on wind direction?
Responda
-
At the poles
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Middle latitudes
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At the equator
Questão 22
Questão
How does Coriolis force affect wind direction in the Southern Hemisphere?
Responda
-
Causes clockwise rotation around a low
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Causes wind to flow out of a low toward a high
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Has exactly the same effect as in the Northern Hemisphere
Questão 23
Questão
Which conditions result in the formation of frost?
Responda
-
The temperature of the collecting surface is at or below freezing and small droplets of moisture are falling
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Dew collects on the surface and then freezes because the surface temperature is lower than the air temperature
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Temperature of the collecting surface is below the dewpoint and the dewpoint is also below freezing
Questão 24
Questão
When will frost most likely form on aircraft surfaces?
Responda
-
On clear nights with stable air and light winds
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On overcast nights with freezing drizzle precipitation
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On clear night with convective action and a small temperature / dewpoint spread
Questão 25
Questão
What is indicated about an air mass if the temperature remains unchanged or decreases slightly as altitude is increase?
Responda
-
The air is unstable
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A temperature inversion exists
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The air is stable
Questão 26
Questão
Which process causes adiabatic cooling?
Responda
-
Expansion of air as it raises
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Movement of air over a colder surface
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Release of latent heat during the vaporization process
Questão 27
Questão
When saturated air moves downhill, its temperature increases:
Responda
-
At a faster than dry air because of the release of latent heat
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At a slower rate than dry air because vaporization uses heat
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At a slower rate than dry air because condensation releases heat
Questão 28
Questão
Which condition is present when a local parcel of air is stable?
Responda
-
The parcel of air resists convection
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The parcel of air cannot be forced uphill
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As the parcel of air moves upward, its temperature becomes warmer than the surrounding air
Questão 29
Questão
Convective clouds which penetrate a stratus layer can produce which threat to instrument flight?
Responda
-
Freezing rain
-
Clear air turbulence
-
Embedded thunderstorms
Questão 30
Questão
Which type clouds are indicative of very strong turbulence?
Responda
-
Nimbostratus
-
Standing lenticular
-
Cirruscumulus
Questão 31
Questão
Which event usually occurs after an aircraft passes through a front into the colder air?
Responda
-
Temperature / dewpoint spread decreases
-
Wind direction shifts to the left
-
Atmospheric pressure increases
Questão 32
Questão
What minimum thickness of cloud layer is indicated if precipitation is reported as light or greater intensity?
Responda
-
4,000 feet thick
-
2,000 feet thick
-
A thickness which allows the cloud tops to be higher than the freezing level
Questão 33
Questão
Which condition produces weather on the lee side of a large lake?
Responda
-
Warm air flowing over a colder lake may produce fog
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Cold air flowing over a warmer lake may produce advection fog
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Warm air flowing over a cool lake may produce rain showers
Questão 34
Questão
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
Responda
-
The appearance of an anvil top
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The start of rain at the surface
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Growth rate of the cloud is at its maximum
Questão 35
Questão
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
Responda
-
Cumulus
-
Dissipating
-
Mature
Questão 36
Questão
What feature is normally associated with the cumulus stage of a thunderstrom?
Responda
-
Beginning of rain at the surface
-
Frequent lightning
-
Continuous updraft
Questão 37
Questão
What is indicated by the term "embedded thunderstorm?
Responda
-
Severe thunderstorms are embedded in a squall line
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Thunderstorms are predicted to develop in a stable air mass
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Thunderstorms are obscured by other types of clouds
Questão 38
Questão
Where do squall lines most often develop?
Responda
-
In an occluted front
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Ahead of a cold front
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Behind a stationary front
Questão 39
Questão
Where can the maximum hazard zone caused by wind shear associated with a thunderstorm be found?
Responda
-
In front of the thunderstorm cell (anvil side) and on the southwest side of the cell
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Ahead of the roll cloud or gust front and directly under the anvil cloud
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On all sides and directly under the thunderstorm cell
Questão 40
Questão
Atmospheric pressure changes due to a thunderstorm will be at the lowest value:
Responda
-
During the downdraft and heavy rain showers
-
When the thunderstorm is approaching
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Immediately after the rain showers have stopped
Questão 41
Questão
Why are downdrafts in a mature thunderstorm hazardous?
Responda
-
Downdrafts are kept cool by cold rain which tends to accelerate the downward velocity
-
Downdrafts converge toward a central location under the storm after striking the surface
-
Downdrafts become warmer than the surrounding air and reverse into an updraft before reaching the surace
Questão 42
Questão
When advection fog has developed, what may tend to dissipate or lift the fog into low stratus clouds?
Responda
-
Temperature inversion
-
Wind stronger than 15 knots
-
Surface radiation
Questão 43
Questão
How are haze layers cleared or dispersed?
Responda
-
By convective mixing in cool night air
-
By wind or the movement of air
-
By evaporation similar to the clearing of fog
Questão 44
Questão
Which type cloud is associated with violent turbulence and a tendency toward the production of funnel clouds?
Responda
-
Cumulonimbus mamma
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Standing lenticular
-
Stratocumulus
Questão 45
Questão
When flying over the top of a severe thunderstorm, the cloud should be overflown by at least:
Responda
-
1,000 feet for each 10 knots windspeed
-
2,500 feet
-
500 feet above any moderate to a severe turbulence layer
Questão 46
Questão
Which weather condition is an example of a nonfrontal instability band?
Responda
-
Squall line
-
Advective fog
-
Frontogenesis
Questão 47
Questão
Under what conditions would clear air turbulence (CAT) most likely be encountered?
Responda
-
When constant pressure charts show 20-knot isotachs less than 60 NM apart
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When constant pressure charts show 60-knot isotachs less than 20 NM apart
-
When a sharp trough is moving at a speed less than 20 knots
Questão 48
Questão
In comparison to an approach in a moderate headwind, which is an indication of a possible wind shear due to a decreasing headwind when descending on the glide slope?
Responda
-
Less power is required
-
Higher pitch attitude is required
-
Lower descent rate is required
Questão 49
Questão
What condition is necessary for the formation of structural icing in flight?
Responda
-
Supercooled water drops
-
Water vapor
-
Visible water
Questão 50
Questão
Which type precipitation is an indication that supercooled water is present?
Responda
-
Wet snow
-
Freezing rain
-
Ice pellets
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