AVA B.txt

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AVA B.txt
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  1. 58 Why does the wind have a tendency to flow parallel to the isobars above the friction level?



    Coriolis force tends to counterbalance the horizontal pressure gradient.



    Coriolis force acts perpendicular to a light connecting the highs and lows.



    Friction of the air with the Earth deflects the air perpendicular to the pressure gradient.
    A
  2. 59 What prevents air from flowing directly from high-pressure areas to low-pressure areas?



    Coriolis force.



    Surface friction.



    Pressure gradient force.
    A
  3. 60 Which would increase the stability of an air mass?



    Warning from below.



    Cooling from below.



    Decrease in water vapor.
    A
  4. 61 Which feature is associated with the tropopause?



    Constant height above the Earth.



    Abrupt change in the temperature lapse rate.



    Absolute upper limit of cloud formation.
    B
  5. 62 A common location of clear air turbulence is



    In an upper trough on the polar side of a jet stream.



    Near a ridge aloft on the equatorial side of a high-pressure flow.



    South of an east/west oriented high-pressure ridge in its dissipating stage.
    A
  6. 63 The jet stream and associated clear air turbulence can sometimes be visually identified in flight by



    Dust or haze at flight level.



    Long streaks of cirrus clouds.



    A constant outside air temperature.
    B
  7. 64 During the winter months in the middle latitudes, the jet stream shifts toward the



    North and speed decreases.



    South and speed increases.



    North and speed increases.
    B
  8. 65 Which type of jet stream can be expected to cause the greater turbulence?



    A straight jet stream associated with a low-pressure trough.



    A curving jet stream associated with a deep low-pressure trough.



    A jet stream occurring during the summer at the lower latitudes.
    B
  9. 66 Which conditions are favorable for the formation of a surface based temperature inversion?



    Clear, cool nights with calm or light wind.



    Area of unstable air rapidly transferring heat from the surface.



    Broad areas of cumulus clouds with smooth, level bases at the same altitude.
    A
  10. 66 Which conditions are favorable for the formation of a surface based temperature inversion?



    Clear, cool nights with calm or light wind.



    Area of unstable air rapidly transferring heat from the surface.



    Broad areas of cumulus clouds with smooth, level bases at the same altitude.
    B
  11. 68 Which is the true with a respect to a high- or low-pressure system?



    A high-pressure area or ridge is an area of rising air.



    A low-pressure area or trough is an area of descending air.



    A high-pressure area or ridge is an area of descending air.
    C
  12. 69 Which is the true regarding high- or low-pressure systems?



    A high-pressure area or ridge is an area of rising air.



    A low-pressure area or trough is an area of rising air.



    Both high- and low-pressure areas are characterized by descending air.
    B
  13. 70 Which is true regarding actual air temperature and dew point temperature spread? The temperature
    spread



    Decreases as the relative humidity decreases.



    Decreases as the relative humidity increases.



    Increases as the relative humidity increases.
    B
  14. 71 Moisture is added to a parcel of air by



    Sublimation and condensation.



    Evaporation and condensation.



    Evaporation and sublimation.
    C
  15. 72 Which would decrease the stability of an air mass?



    Warming from below.



    Cooling from below.



    Decrease in water vapor.
    A
  16. 73 What determines the structure or type of clouds which will form as a result of air being forced to
    ascend?



    The method by which the air is lifted.



    The stability of the air before lifting occurs.



    The relative humidity of the air after lifting occurs.
    B
  17. 74 When conditionally unstable air with high-moisture content and very warm surface temperature is
    forecast, one can expect what type of weather?



    Strong updrafts and stratonimbus clouds.



    Restricted visibility near the surface over a large area.



    Strong updrafts and cumulonimbus clouds.
    C
  18. 75 If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the clouds
    will be



    Cirrus type with no vertical development or turbulence.



    Cumulus type with considerable vertical development and turbulence.



    Stratus type with little vertical development and little or no turbulence.
    C
  19. 76 What type weather can one expect from moist, unstable air, and very warm surface temperatures?



    Fog and low stratus clouds.



    Continuous heavy precipitation.



    Strong updrafts and cumulonimbus clouds.
    C
  20. 77 The conditions necessary for the formation of stratiform clouds are a lifting action and



    Unstable, dry air.



    Stable, moist air.



    Unstable, moist air.
    B
  21. 78 Which cloud types would indicate convective turbulence?



    Cirrus clouds.



    Nimbostratus clouds.



    Towering cumulus clouds.
    C
  22. 79 Which combination of weather-producing variables would likely result in cumuliform-type clouds, good
    visibility, and showery rain?



    Stable, moist air and orographic lifting.



    Unstable, moist air and orographic lifting.



    Unstable, moist air and no lifting mechanism
    B
  23. 80 What are the characteristics of stable air?



    Good visibility, steady precipitation, stratus clouds.



    Poor visibility, steady precipitation, stratus clouds.



    Poor visibility, intermittent precipitation, cumulus clouds.
    B
  24. 81 What is a characteristic of stable air?



    Stratiform clouds.



    Fair weather cumulus clouds.



    Temperature decreases rapidly with altitude.
    A
  25. 82 When an air mass is stable, which of these conditions are most likely to exist?



    Numerous towering cumulus and cumulonimbus clouds.



    Moderate to severe turbulence at the lower levels.



    Smoke, dust, haze, etc., concentrated at the lower levels with resulting poor visibility.
    C
  26. 83 Which is characteristic of stable air?



    Cumuliform clouds.



    Excellent visibility.



    Restricted visibility.
    C
  27. 84 Which is a characteristic typical of a stable air mass?



    Cumuliform clouds.



    Showery precipitation.



    Continuous precipitation.
    C
  28. 85 Which are characteristics of a cold air mass moving over a warm surface?



    Cumuliform clouds, turbulence, and poor visibility.



    Cumuliform clouds, turbulence, and good visibility.



    Stratiform clouds, smooth air, and poor visibility.
    B
  29. 86 Which is true regarding a cold from occlusion? The air ahead of the warm front



    Is colder than the air behind the overtaking cold front.



    Is warmer than the air behind the overtaking cold front.



    Has the same temperature as the air behind the overtaking cold front.
    B
  30. 87 The conditions most favorable to wave formation over mountainous areas are a layer of



    Stable air at mountaintop altitude and a wind of at least 20 knots blowing across the ridge.



    Unstable air at mountaintop altitude and a wind of at least 20 knots blowing across the ridge.



    Moist, unstable air at mountaintop altitude and a wind of less than 5 knots blowing across the ridge.
    A
  31. 88 One of the most dangerous features of mountain waves is the turbulent areas in and



    Below rotor clouds.



    Above rotor clouds.



    Below lenticular clouds.
    A
  32. 89 Virga is best described as



    Streamers of precipitation trailing beneath clouds which evaporates before reaching the ground.



    Wall cloud torrents trailing beneath cumulonimbus clouds which dissipate before reaching the ground.



    Turbulent areas beneath cumulonimbus clouds.
    A
  33. 90 The most severe weather conditions, such as destructive winds, heavy hail, and tornadoes, are
    generally associated with.



    Slow-moving warm fronts which slope above the tropopause.



    Squall lines.



    Fast-moving occluded fronts.
    B
  34. 91 If airborne radar is indicating an extremely intense thunderstorm echo, this thunderstorm should be
    avoided by a distance of at least



    20 miles.



    10 miles.



    5 miles.
    A
  35. 92 What visible signs indicate extreme turbulence in thunderstorm?



    Base of the clouds near the surface, heavy rain, and hail.



    Low ceiling and visibility, hail, and precipitation static.



    Cumulonimbus clouds, very frequent lightning, and roll clouds.
    C
  36. 93 Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?



    The start of rain.



    The appearance of an anvil top.



    Growth rate of clouds is maximum.
    A
  37. 94 What feature is normally associated with the cumulus stage of thunderstorm?



    Roll cloud.



    Continuous updraft.



    Beginning of rain at the surface.
    B
  38. 95 During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?



    Mature.



    Developing.



    Dissipating.
    C
  39. 96 What minimum distance should exist between intense radar echoes before any attempt is made to fly
    between these thunderstorms?



    20 miles.



    30 miles.



    40 miles.
    C
  40. During an IFR 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 al 2000 feet AGL and are approaching your
    destination airport under VFR. Visibility under 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 degrees
    Celsius. You decide to:



    Use a faster than normal approach and landing speed.



    Approach and land at your normal speed since the ice is not thick enough to have any noticeable effect.



    Fly your approach slower than normal to lessen the “wind chill” effect and break up the ice.
    A
  41. 98 Frost covering the upper surface of an airplane wing usually will cause.



    The airplane to stall at an angle of attack that is higher than normal.



    The airplane to stall at an angle of attack that is lower than normal.



    Drag factors so large that sufficient speed cannot be obtained for takeoff.

  42. 99 A characteristic of the stratosphere is



    An overall decrease of temperature with an increase in altitude.



    A relatively even base altitude of approximately 35.000 feet.



    Relatively small changes in temperature with an increase in altitude.
    C
  43. 100 Which feature is associated with the tropopause?



    Absence of wind and turbulent conditions.



    Absolute upper limit of cloud formation.



    Abrupt change in temperature lapse rate.
    C
  44. 101 A jet stream is defined as wind of





    a. 30 knots or greater.




    40 knots or greater.



    50 knots or greater.
    C
  45. 102 The primary cause of all changes in the Earth’s weather is



    Variation of solar energy received by the Earth’s regions.



    Changes in air pressure over the Earth’s surface.



    Movement of the air masses.
    A
  46. 103 If the air temperature is +8oC at an elevation of 1.350 feet and a standard (average) temperature lapse
    rate exists, what will be the approximate freezing level?



    3.350 feet MSL.



    5.350 feet MSL.



    9.350 feet MSL.
    B
  47. 104 A common type of ground or surface based temperature inversion is that which is produced by



    Warm air being lifted rapidly aloft in the vicinity of mountainous terrain.



    The movement of colder air over warm air, or the movement f warm air under cold air.



    Ground radiation on clear, cool nights when the wind is light.
    C
  48. 105 What feature is associated with temperature inversion?



    A stable layer of air.



    An unstable layer of air.



    Air mass thunderstorms.
    A
  49. 106 Which weather conditions should be expected beneath a low-level temperature inversion layer when
    the relative humidity is high?



    Smooth air and poor visibility due to fog, haze, r low clouds.



    Light wind shear and poor visibility due t haze and light rain.



    Turbulence air and poor visibility due to fog, low stratus-type clouds, and showery precipitation.
    A
  50. 107 Which force, in the Northern Hemisphere, acts at a right angle to the wind and deflects it to the right
    until parallel to the isobars?



    Centrifugal.



    Pressure gradient.



    Coriolis.
    C
  51. 108 Clouds, fog, or dew will always form when



    Water vapor condenses.



    Water vapor is present.



    The temperature and dew point are equal.
    A
  52. 109 To which meteorological condition does the term “dew point” refer?



    The temperature to which air must be cooled to become saturated.



    The temperature at which condensation and evaporation are equal.



    The temperature at which dew will always form.
    A
  53. 110 The amount of water vapor which air can hold largely depends on



    Relative humidity.



    Air temperature.



    Stability of air.
    B
  54. 111 What enhances the growth rate of precipitation?



    Advective action.



    Upward currents.



    Cyclonic movement.
    B
  55. 112 The formation of either predominantly stratiform or predominantly cumuliform clouds is dependent upon
    the



    Source of lift



    Stability of air being lifted



    Temperature of the air being lifted
    B
  56. 113 Stability can be determined from which measurement of the atmosphere?



    Low-level winds.



    Ambient lapse rate.



    Atmospheric pressure.
    B
  57. 114 What determines the structure or type of clouds which form as a result of air being forced to ascend?



    The method by which the air is lifted.



    The stability of the air before lifting occurs.



    The amount of condensation nuclei present after lifting occurs.
    B

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