Chapter 6.1 (21-40)

chapter-6-1-21-40

Exit

Question 1 of 1

Time Left

376920

180

block

What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70°F and the dewpoint is 48°F?

Select the correct answer(s).

(0/0)

Explanation

Cloud bases can be estimated by using a lapse rate of 4.5°F per 1,000 feet and the temperature/dewpoint spread (70 – 48 = 22). Divide 22 by 4.5 to find the approximate cloud base in thousands of feet. In this case, the cloud bases will be 4,889 (22 / 4.5

376921

180

none

At approximately 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?

Select the correct answer(s).

(0/0)

Explanation

Cloud bases can be estimated by using a lapse rate of 4.5°F per 1,000 feet and the temperature/dewpoint spread.

376922

180

none

What are characteristics of moist, unstable air mass?

Select the correct answer(s).

(0/0)

Explanation

Cumuliform clouds are indicative of unstable air. These clouds normally produce showery, not continuous, precipitation. Poor visibility, smooth air, and stratiform clouds are characteristics of stable air.

376923

180

none

What are characteristics of unstable air?

Select the correct answer(s).

(0/0)

Explanation

The lifting motion of unstable air produces turbulence. Clouds and pollutants are not trapped as they are in stable layers of air, and good visibility is typical with unstable air. Poor surface visibility and nimbostratus clouds are typical of stable air

376924

180

none

A stable air mass is most likely to have which characteristics?

Select the correct answer(s).

(0/0)

Explanation

Stable air resists the lifting motion that is associated with turbulence, and is typically smooth. Showery precipitation and turbulent air are characteristics of unstable air.

376925

180

none

The suffix “nimbus” used in naming clouds, means

Select the correct answer(s).

(0/0)

Explanation

The word “nimbus” is the Latin word for rainstorm or cloud, and is used today to designate rain clouds, such as cumulonimbus or nimbostratus.

376926

180

none

Clouds are divided into four families according to their

Select the correct answer(s).

(0/0)

Explanation

Clouds are also grouped by families according to their altitudes (height range). The four families are low, middle, high, and clouds with extensive vertical development.

376927

180

none

The boundary between two different air masses is referred to as a

Select the correct answer(s).

(0/0)

Explanation

The boundary area where two air masses of different properties meet is called a front.

376928

180

none

One of the most easily recognized discontinuities across a front is

Select the correct answer(s).

(0/0)

Explanation

Since a front is the boundary between air masses of differing temperatures, one of the easiest ways to recognize frontal passage is the change in temperature.

376929

180

none

One weather phenomenon which will always occur when flying across a front is a change in the

Select the correct answer(s).

(0/0)

Explanation

A shift in wind direction always occurs across a front

376930

180

none

Steady precipitation preceding a front is an indication of

Select the correct answer(s).

(0/0)

Explanation

Steady precipitation, stratiform clouds, and little or no turbulence are all typical of stable air.

376931

180

none

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

Select the correct answer(s).

(0/0)

Explanation

On clear, calm nights in flat areas, radiation fog forms when moist air cools to its dewpoint. Ground fog is a form of radiation fog.

376932

180

none

If the temperature/dewpoint spread is small and decreasing, and the temperature is 62°F, what type weather is most likely to develop?

Select the correct answer(s).

(0/0)

Explanation

When the temperature/dewpoint spread decreases to zero, the likely result is the condensation of water vapor into visible moisture, such as fog or low clouds.

376933

180

none

In which situation is advection fog most likely to form?

Select the correct answer(s).

(0/0)

Explanation

On clear, calm nights in flat areas, radiation fog forms when moist air cools to its dewpoint. Ground fog is a form of radiation fog. When warmer air moves inland, advection fog is likely to form.

376934

180

none

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

Select the correct answer(s).

(0/0)

Explanation

On clear, calm nights in flat areas, radiation fog forms when moist air cools to its dewpoint. Ground fog is a form radiation fog. When warmer air moves inland, advection fog is likely to form.

Chapter 6.1 (21-40)

Question 1 of 1

Time Left

What is the approximate base of the cumulus clouds if the surface air temperature at 1,000 feet MSL is 70°F and the dewpoint is 48°F?

Select the correct answer(s).

(0/0)

Explanation

At approximately 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?

Select the correct answer(s).

(0/0)

Explanation

What are characteristics of moist, unstable air mass?

Select the correct answer(s).

(0/0)

Explanation

What are characteristics of unstable air?

Select the correct answer(s).

(0/0)

Explanation

A stable air mass is most likely to have which characteristics?

Select the correct answer(s).

(0/0)

Explanation

The suffix “nimbus” used in naming clouds, means

Select the correct answer(s).

(0/0)

Explanation

Clouds are divided into four families according to their

Select the correct answer(s).

(0/0)

Explanation

The boundary between two different air masses is referred to as a

Select the correct answer(s).

(0/0)

Explanation

One of the most easily recognized discontinuities across a front is

Select the correct answer(s).

(0/0)

Explanation

One weather phenomenon which will always occur when flying across a front is a change in the

Select the correct answer(s).

(0/0)

Explanation

Steady precipitation preceding a front is an indication of

Select the correct answer(s).

(0/0)

Explanation

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

Select the correct answer(s).

(0/0)

Explanation

If the temperature/dewpoint spread is small and decreasing, and the temperature is 62°F, what type weather is most likely to develop?

Select the correct answer(s).

(0/0)

Explanation

In which situation is advection fog most likely to form?

Select the correct answer(s).

(0/0)

Explanation

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

Select the correct answer(s).

(0/0)

Explanation

Results

Correct

0

Incorrect

0

Skipped

0

Overall Percentage

0%

Rate Quiz