Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
73 Cards in this Set
- Front
- Back
The atmosphere of the earth is comprised of how many basic layers?
|
1. Five
|
|
The troposphere is the atmospheric layer of the earth's atmosphere that extends upward from the earth's surface to approximately what height?
|
1. 7 miles
|
|
In what layer of the atmosphere does most weather occur?
|
2. Troposphere
|
|
The stratosphere extends upward from the tropopause to approximately what height above earth's surface?
|
3. 30 miles
|
|
A barometric pressure of 28.94 inches is the same as a barometric pressure of how many millibars?
|
4. 980 millibars
|
|
A barometric pressure of 30.12 inches is the same as how many millibars of barometric pressure?
|
1. 1,020 millibars
|
|
The standard sae-level pressure is how many inches of mercury?
|
2. 29.92
|
|
When an aircraft flies from a high-temperature area to a low-temperature area, its altimiter reading will have what relationshipwith the actual altitude?
|
1. Too high
|
|
If an altimeter is not adjusted, a pressure change of 1 inch of mercury will result in an altimeter error of how many feet?
|
3. 1,000 ft
|
|
A low-pressure weather area is the same as what type of weather system?
|
1. Cyclonic
|
|
What are the characteristics of a cyclone in the Northern Hemisphere?
|
1. A low-pressure area with winds that circulate in a counterclockwise direction.
|
|
In the Northern Hemisphere, the wind around a high-pressure area flows in what direction?
|
3. Clockwise
|
|
Compared to weather conditions associated with low-pressure weather systems, which of the following are weather conditions associated with high-pressure weather that make for favorable flying conditions?systems
|
1. Fewer clouds and less visibility; 2. Less areas of concentrated turbulence; 3. Less winds; 4. Each of the above
|
|
For a cloud to be composed almos entirely with ice crystals, the temperature of the surrounding air must be below what specific temperature?
|
1. 5°F
|
|
What type of cloud has bases that are nearly horizontal and have dome-shaped upper surfaces?
|
2. Cumulus
|
|
The term "mackerel sky" is associated with what type of cloud?
|
2. Cirrocumulus
|
|
A thick, gray or blue-gray, smooth overcast appearance shows what type of cloud?
|
3. Altostratus
|
|
What type of cloud is always accompanied by precipitation?
|
4. Nimnbostratus
|
|
A flat, shapeless, and dull gray layer is a characteristic of what type of cloud?
|
1. Stratus
|
|
Which of the following types of clouds have great verticle developments that resemble mountains or towers?
|
3. Cumulonimbus
|
|
Which of the following cloud formations may have tops that extend above an altitude of 60,000 feet?
|
2. Cumulonimbus
|
|
Of the following types of cloud formations, which one is normally located between an altitude of 6,500 and 23,000feet?
|
4. Altostratus
|
|
When air stagnates over certain areas, it acquires the properties from what region?
|
2. The air mass region
|
|
When two air masses meet, what weather term refers to the boundary that separates the masses?
|
4. Front
|
|
Fronts are generally classified according to the relative motions of what weather phenomonon?
|
3. Air masses
|
|
What weather phenomenon occurs when a region that is occupied by warm air is invaded by a cold air mass?
|
3. The cold air pushes the warm air upward.
|
|
Which of the following weater characteristics is NOT associated with the passage of a coold front?
|
1. Decreasing pressure
|
|
Squall lines are associated with what type of front?
|
3. A fast-moving cold front
|
|
What is normally the average speed of a warm front?
|
2. 10 knots
|
|
What type of front usually causes extended periods of poor flying weather?
|
1. Stationary
|
|
What type if front is formed when a surface cold front overtakes a warm front?
|
1. Occluded
|
|
An occluded front occurs as a result of what action?
|
4. A cold front overtaking a warm front
|
|
What are the two types of occluded weather fronts?
|
4. Warm and cold
|
|
A cloud on the earth's surface is called fog. This fog is composed of what form or forms of water?
|
2. Minute, suspended, and visible droplets or ice particles
|
|
The temperature to which air under constant pressure with a constant water vapor content must be cooled to become saturated is known as the
|
2. dew point
|
|
The basis for the prediction of fog is provided by the differential between the
|
4. Dew point and temperature
|
|
Fog seldom forms when the dew-point spread is greater than how many degrees?
|
4. 4°F
|
|
Fog is divided into how many classes?
|
2. Two
|
|
Which of the following combinations of meteorological conditions is most likely to produce a deep and dense fog?
|
2. A light wind with dust-laden air
|
|
When there is sufficient humidity, which of the following environments is most favoarble for the formation of radiation fog?
|
1. A clear sky at night
|
|
What type of fog is formed when an air mass passes over a cooler surface?
|
3. Advection
|
|
What type of fog is most commonly known as ground fog?
|
4. Radiation
|
|
What type of fog forms when air is pushed up a gradual slope?
|
4. Upslope fog
|
|
Under what conditions does steam fog occur?
|
1. Cold air passes over the surface of a warm water body and becomes saturated with water that evaporates from the body
|
|
Warm-front fog forms as a result of what phenomenon?
|
3. Rain falling from warm air into cold air
|
|
What type of precipitationis normally the most effective at reducing visibility?
|
1. Snow
|
|
What type if icing results when a film of liquid water freezes from the inside out forming a transparent, dense, strong layer of ice on aircraft surfaces?
|
3. Clear ice
|
|
Icing conditions encoiuntered in flight result from a combination of what two types of icing?
|
3. Clear and rime
|
|
Icing that is not generally hazardous to aircraft is known as what type of icing?
|
4. Trace
|
|
Rime ice forms under what conditions?
|
3. Supercooled droplets of water strike an airfoil and freeze completely before another droplet starts in the same place
|
|
Which of the following icing conditions normally forms on aircraft on the ground?
|
3. Frost
|
|
A high performance aircraft is flying rapidly from a region whose temperature is well below freezong to another region where the temperature is considerably higher and the air is very moist. What type of aircraft icing will be caused?
|
1. Frost
|
|
Vaporized fuel thet is combined with expanding air causes aircraft engine failure when what type of icing occurs?
|
2. Carburetor icing
|
|
Icing requires immediate flight diversion when the icing is of what classification?
|
3. Severe
|
|
Air near the surface of the earth flowing over an obstruction causes what type of turbulence?
|
4. Mechanical
|
|
What type of turbulence is caused by cold air moving over warmer ground?
|
1. Thermal
|
|
What type of natural disturbance is defined as a severe change in either wind speed or wind direction?
|
4. Wind shear
|
|
The term 'chop' refers to a type of turbulence that has what affect on an aircraft?
|
4. A rhythmic bumpiness to the aircraft with little altitude change
|
|
What type of turbulence causes abrupt changes in attitude and altitude?
|
3. Severe
|
|
The intensities of turbulence are based on what factor or factors?
|
1. Type of aircraft and aircraft reaction
|
|
A pilot has given you a report relating to in-flight turbulence. The pilot has included altitude, position, time turbulence noted, and intensity of turbulence. What other information must you obtain from the pilot with reference to the report?
|
1. Type of aircraft involved
|
|
What type of frozen precipitation is associated with thunderstorm activity?
|
2.Hail
|
|
The three distinct stages of a thunderstorm in its life cycle are
|
3. cumulus. mature, and dissipating
|
|
At what stage in the life cycle of a thunderstorm do surface rains begin to fall?
|
3. Mature
|
|
During the cumulus stage of a thunderstorm, updrafts can reach a speed of up to what maximum number of feet per second?
|
2. 100 ft/sec
|
|
A thunderstorm is approaching your area. You notice that the cloud has formed into an anvil shape. What does this shape indicate?
|
2. The cell is starting to dissipate
|
|
During the mature stage of a thunderstorm, the peak average cell acan attain heights at or above what minimum altitude?
|
4. 25,000 ft
|
|
Severe of extreme turbulence is most often found in what part of a thunderstorm?
|
2.Anvil cloud
|
|
Lightning is a hazard of a thunderdstorm that may strike the ground up to how many miles away from the cloud?
|
2. 12 miles
|
|
The downdrafts of a thunderstorm are initiated by what cause?
|
1. Frictional drag of rainfall
|
|
Downdrafts are significant in what stages of a thunderstorm?
|
4. Mature and anvil
|
|
Hail can be encountered up to what maximum distance ahead of a thumderstorm?
|
3. 25 miles
|
|
The strong surface winds associated with a thunderstorm are caused by which of the following actions?
|
4. Horizontal spreading of downdraft currents approaching earth's surface
|