Met 5

83問 • 1年前

Via

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問題一覧

The average height of the troposphere in the middle latitudes is

37,000 feet.

What causes wind?

Pressure differences.

A high cloud is composed mostly of

ice crystals.

Under what condition is pressure altitude and density altitude the same value?

At standard temperature.

What hazard should you expect for a morning departure from KPDX, based on this METAR? KPDX 271154Z 00000KT 9SM CLR -10/-10 A2979.

Frost on the aircraft.

Which conditions result in the formation of frost?

Temperature of the collecting surface is below the dewpoint of surrounding air and the dewpoint is colder than freezing.

Which is characteristic of low level wind shear as it relates to frontal activity?

With a warm front, the most critical period is before the front passes the airport.

A flight is scheduled at daybreak. The current conditions are rainy, but conditions are expected to clear. The forecast temperature is 10°C, dew point 10°C, with winds 330° at 5 knots. What weather conditions can you expect?

The conditions are favorable for radiation fog.

Altimeter setting is the value to which the scale of the pressure altimeter is set so the altimeter indicates

true altitude and at field elevation.

Some of the characteristics you would expect to see with an unstable air mass are

turbulence and good surface visibility.

Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?

Smooth air, poor visibility, fog, haze, or low clouds.

Clouds, fog, or dew will always form when

water vapor condenses.

Why is frost considered hazardous to flight operation?

Frost causes early airflow separation resulting in a loss of lift.

A common type of ground or surface based temperature inversion is that which is produced by

ground radiation on clear, cool nights when the wind is light.

In which situation is advection fog most likely to form?

An air mass moving inland from the coast in winter.

The primary cause of all changes in the Earth's weather is

variation of solar energy received by the Earth's regions.

What are the characteristics of stable air?

Poor visibility; steady precipitation; stratus clouds.

What situation is most conducive to the formation of radiation fog?

Warm, mosit air over low, flatland areas on clear, calm nights.

Which weather phenomenon is always associated with the passage of a frontal system?

A wind change.

What is a important characteristic of wind shear?

It is an atmospheric condition that may be associated with a low level temperature inversion, a jet stream, or a frontal zone.

Where can wind shear associated with a thunderstorm be found? Choose the most complete answer.

On all side of the thunderstorm cell and directly under the cell.

What feature is associated with a temperature inversion?

A stable layer of air.

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?

Coriolis.

What causes surface winds to flow across the isobars at an angle rather than parallel to the isobars?

Surface friction.

Which weather condition can be expected when moist air flows from a relatively warm surface to a colder surface?

Fog.

What types of fog depend upon a wind in order to exist?

Advection fog and upslope fog.

The amount of water vapor which air can hold largely depends on

air temperature.

How can you obtain the pressure altitude on flights below 18,000 feet?

Set your altimeter to 19.92" Hg.

Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to

friction between the wind and the surface.

If squalls are reported at your destination, what wind conditions should you anticipate?

Sudden increases in wind speed of at least 16 knots rising to 22 knots or more, lasting for at least 1 minute.

The presence of ice pellets at the surface is evidence that

there is freezing rain at a higher altitude.

The most frequent type of ground or surface based temperature inversion is that produced by

radiation on a clear, relatively still night.

What temperature condition is indicated if wet snow is encountered at your flight altitude?

The temperature is above freezing at your altitude.

The tropopause is generally found when the free air temperature are

between -55° and -65°C

Where does wind shear occur?

With either a wind shift or a windspeed gradient at any level in the atmosphere.

What is the time frame for the validity of Low-Level Significant Weather Prog Charts?

12 to 24 hours in the future.

The Air Data Computer or ADC

combines data from the pitot-static sensors and temperature sensors.

Unsaturated air flowing up slope will cool at the rate of approximately (dry adiabatic lapse rate)

3°C per 1,000 feet.

The suffic "nimbus", is used in naming clouds, means a

rain cloud.

A ceiling is defined as the height of the

lowest layer of clouds or obscuring phenomena aloft that is reported as broken or overcast.

Which precipitation type normally indicates freezing rain at higher altitudes?

Ice pellets.

What type turbulence should be reported when it causes slight, rapid, and somewhat rhythmic bumpiness without appreciable changes in attitude or altitude, less than one-third of the time?

Occasional light chop.

Fog is usually prevalent in industrial areas because of

an abundance of condensation nuclei from combustion products.

Which feature is associated with the tropopause?

Abrupt change of temperature lapse rate.

What course of action should the pilot take if encountering freezing rain?

Climb because the temperature is warmer at a higher altitude.

If the air temperature is +8 °C at an elevation of 1,350 feet and a standard (average) temperature lapse rate exists, what will be the approximate freezing level?

5,350 feet MSL.

Which family of clouds is least likely to contribute to structural icing on an aircraft?

High clouds.

An air mass is a body of air that

covers an extensive area and has fairly uniform properties of temperature and moisture.

What type of clouds will be formed if very stable moist air is forced up slope?

Stratified clouds with little vertical development.

What temperature condition is indicated if precipitation in the form of wet snow occurs during flight?

The temperature is above freezing at flight altitude.

In what localities is advection fog most likely to occur?

Coastal areas.

The strength and location of the jet stream is normally

weaker and farther north in the summer.

What are the four families of clouds?

High, middle, low, and those with extensive vertical development.

What is an important characteristic of wind shear?

It may be associated with either a wind shift or a windspeed gradients at any level in th atmosphere.

What determines the structure or type of clouds which form as a result of air being forced to ascend?

The stability of the air before lifting occurs.

Stability can be determined from which measurement of the atmosphere?

Ambient lapse rate.

What weather difference is found on each side of a "dry line"?

Dewpoint difference.

A characteristic of the stratosphere is

relatively small changes in temperature with an increase in altitude.

In which meteorological environment is aircraft structural icing most likely to have the highest rate of accumulation?

Freezing rain.

Under which condition does advection fog usually form?

Moist air moving over colder ground or water.

What is an operational consideration if you fly into rain which freezes on impact?

Temperatures are above freezing at some higher altitude.

Steady precipitation. in contrast to showers, preceding a front is an indication of

stratiform clouds with little or no turbulence.

Which conditions are favorable for the formation of radiation fog?

Clear sky, little or no wind, small temperature/dewpoint spread, and over a land surface.

The weather condition normally associated with unstable air is

Good visibility, except in blowing sand or snow.

What relationship exists between the winds at 2,000 feet above the surface and the surface winds?

The winds at 2,000 feet tend to parallel the isobars while the surface winds cross the isobars at an angle toward lower pressure and are weaker.

Large areas of land

tend to increase temperature variations.

The general characteristic of unstable air are

good visibility, showery precipitation, and cumuliform type clouds.

One of the visual cues of supercooled large water droplet (SLD) conditions is

ice forming on the propeller spinner and reaching back to the propeller blades.

Where can supercooled large drops (SLD) form?

In freezing precipitation below a cloud deck.

How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast? FT 6000 9000 0737-04 1043-10

7°C

Stable air has the following properties:

poor visibility, steady precipitation, and stratus type clouds.

Moisture is added to air by

evaporation and sublimation.

Which is a characteristic of stable air?

Stratiform clouds.

A temperature inversion will normally form only

in stable air.

What enhances the growth rate of precipitation?

Upward currents.

You have delayed your flight to allow a fast moving cold front to clear your destination airport before your arrival. What type of flying conditions would you expect after the front has passed?

Clear skies with gusty, turbulent winds and cooler temperatures.

In the Northern Hemisphere, surface wind spirals clockwise and outward from high pressure and counterclockwise and inward into low pressure. Where would wind not be consistent with this concept?

Over mountainous areas.

A jet stream is defined as wind of

50 knots or greater.

Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to

friction between the wind and the surface.

Under which condition will pressure altitude be equal to true altitude?

When standard atmospheric conditions exist.

To which meteorological condition does the term 'dew point' refer?

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

When approaching a cumulonimbus cell that is on your route of flight, a pilot should

circumnavigate the cell by at least 20 nautical miles.

Supercooled large drops (SLD) form when

temperatures are below freezing and there is a large volume of liquid water precipitation.

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Met 3

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Met 7

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問題一覧

The average height of the troposphere in the middle latitudes is

37,000 feet.

What causes wind?

Pressure differences.

A high cloud is composed mostly of

ice crystals.

Under what condition is pressure altitude and density altitude the same value?

At standard temperature.

What hazard should you expect for a morning departure from KPDX, based on this METAR? KPDX 271154Z 00000KT 9SM CLR -10/-10 A2979.

Frost on the aircraft.

Which conditions result in the formation of frost?

Temperature of the collecting surface is below the dewpoint of surrounding air and the dewpoint is colder than freezing.

Which is characteristic of low level wind shear as it relates to frontal activity?

With a warm front, the most critical period is before the front passes the airport.

The conditions are favorable for radiation fog.

Altimeter setting is the value to which the scale of the pressure altimeter is set so the altimeter indicates

true altitude and at field elevation.

Some of the characteristics you would expect to see with an unstable air mass are

turbulence and good surface visibility.

Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?

Smooth air, poor visibility, fog, haze, or low clouds.

Clouds, fog, or dew will always form when

water vapor condenses.

Why is frost considered hazardous to flight operation?

Frost causes early airflow separation resulting in a loss of lift.

A common type of ground or surface based temperature inversion is that which is produced by

ground radiation on clear, cool nights when the wind is light.

In which situation is advection fog most likely to form?

An air mass moving inland from the coast in winter.

The primary cause of all changes in the Earth's weather is

variation of solar energy received by the Earth's regions.

What are the characteristics of stable air?

Poor visibility; steady precipitation; stratus clouds.

What situation is most conducive to the formation of radiation fog?

Warm, mosit air over low, flatland areas on clear, calm nights.

Which weather phenomenon is always associated with the passage of a frontal system?

A wind change.

What is a important characteristic of wind shear?

It is an atmospheric condition that may be associated with a low level temperature inversion, a jet stream, or a frontal zone.

Where can wind shear associated with a thunderstorm be found? Choose the most complete answer.

On all side of the thunderstorm cell and directly under the cell.

What feature is associated with a temperature inversion?

A stable layer of air.

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?

Coriolis.

What causes surface winds to flow across the isobars at an angle rather than parallel to the isobars?

Surface friction.

Which weather condition can be expected when moist air flows from a relatively warm surface to a colder surface?

Fog.

What types of fog depend upon a wind in order to exist?

Advection fog and upslope fog.

The amount of water vapor which air can hold largely depends on

air temperature.

How can you obtain the pressure altitude on flights below 18,000 feet?

Set your altimeter to 19.92" Hg.

Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to

friction between the wind and the surface.

If squalls are reported at your destination, what wind conditions should you anticipate?

Sudden increases in wind speed of at least 16 knots rising to 22 knots or more, lasting for at least 1 minute.

The presence of ice pellets at the surface is evidence that

there is freezing rain at a higher altitude.

The most frequent type of ground or surface based temperature inversion is that produced by

radiation on a clear, relatively still night.

What temperature condition is indicated if wet snow is encountered at your flight altitude?

The temperature is above freezing at your altitude.

The tropopause is generally found when the free air temperature are

between -55° and -65°C

Where does wind shear occur?

With either a wind shift or a windspeed gradient at any level in the atmosphere.

What is the time frame for the validity of Low-Level Significant Weather Prog Charts?

12 to 24 hours in the future.

The Air Data Computer or ADC

combines data from the pitot-static sensors and temperature sensors.

Unsaturated air flowing up slope will cool at the rate of approximately (dry adiabatic lapse rate)

3°C per 1,000 feet.

The suffic "nimbus", is used in naming clouds, means a

rain cloud.

A ceiling is defined as the height of the

lowest layer of clouds or obscuring phenomena aloft that is reported as broken or overcast.

Which precipitation type normally indicates freezing rain at higher altitudes?

Ice pellets.

What type turbulence should be reported when it causes slight, rapid, and somewhat rhythmic bumpiness without appreciable changes in attitude or altitude, less than one-third of the time?

Occasional light chop.

Fog is usually prevalent in industrial areas because of

an abundance of condensation nuclei from combustion products.

Which feature is associated with the tropopause?

Abrupt change of temperature lapse rate.

What course of action should the pilot take if encountering freezing rain?

Climb because the temperature is warmer at a higher altitude.

If the air temperature is +8 °C at an elevation of 1,350 feet and a standard (average) temperature lapse rate exists, what will be the approximate freezing level?

5,350 feet MSL.

Which family of clouds is least likely to contribute to structural icing on an aircraft?

High clouds.

An air mass is a body of air that

covers an extensive area and has fairly uniform properties of temperature and moisture.

What type of clouds will be formed if very stable moist air is forced up slope?

Stratified clouds with little vertical development.

What temperature condition is indicated if precipitation in the form of wet snow occurs during flight?

The temperature is above freezing at flight altitude.

In what localities is advection fog most likely to occur?

Coastal areas.

The strength and location of the jet stream is normally

weaker and farther north in the summer.

What are the four families of clouds?

High, middle, low, and those with extensive vertical development.

What is an important characteristic of wind shear?

It may be associated with either a wind shift or a windspeed gradients at any level in th atmosphere.

What determines the structure or type of clouds which form as a result of air being forced to ascend?

The stability of the air before lifting occurs.

Stability can be determined from which measurement of the atmosphere?

Ambient lapse rate.

What weather difference is found on each side of a "dry line"?

Dewpoint difference.

A characteristic of the stratosphere is

relatively small changes in temperature with an increase in altitude.

In which meteorological environment is aircraft structural icing most likely to have the highest rate of accumulation?

Freezing rain.

Under which condition does advection fog usually form?

Moist air moving over colder ground or water.

What is an operational consideration if you fly into rain which freezes on impact?

Temperatures are above freezing at some higher altitude.

Steady precipitation. in contrast to showers, preceding a front is an indication of

stratiform clouds with little or no turbulence.

Which conditions are favorable for the formation of radiation fog?

Clear sky, little or no wind, small temperature/dewpoint spread, and over a land surface.

The weather condition normally associated with unstable air is

Good visibility, except in blowing sand or snow.

What relationship exists between the winds at 2,000 feet above the surface and the surface winds?

The winds at 2,000 feet tend to parallel the isobars while the surface winds cross the isobars at an angle toward lower pressure and are weaker.

Large areas of land

tend to increase temperature variations.

The general characteristic of unstable air are

good visibility, showery precipitation, and cumuliform type clouds.

One of the visual cues of supercooled large water droplet (SLD) conditions is

ice forming on the propeller spinner and reaching back to the propeller blades.

Where can supercooled large drops (SLD) form?

In freezing precipitation below a cloud deck.

How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast? FT 6000 9000 0737-04 1043-10

7°C

Stable air has the following properties:

poor visibility, steady precipitation, and stratus type clouds.

Moisture is added to air by

evaporation and sublimation.

Which is a characteristic of stable air?

Stratiform clouds.

A temperature inversion will normally form only

in stable air.

What enhances the growth rate of precipitation?

Upward currents.

You have delayed your flight to allow a fast moving cold front to clear your destination airport before your arrival. What type of flying conditions would you expect after the front has passed?

Clear skies with gusty, turbulent winds and cooler temperatures.

In the Northern Hemisphere, surface wind spirals clockwise and outward from high pressure and counterclockwise and inward into low pressure. Where would wind not be consistent with this concept?

Over mountainous areas.

A jet stream is defined as wind of

50 knots or greater.

Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to

friction between the wind and the surface.

Under which condition will pressure altitude be equal to true altitude?

When standard atmospheric conditions exist.

To which meteorological condition does the term 'dew point' refer?

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

When approaching a cumulonimbus cell that is on your route of flight, a pilot should

circumnavigate the cell by at least 20 nautical miles.

Supercooled large drops (SLD) form when

temperatures are below freezing and there is a large volume of liquid water precipitation.