Quiz 2

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Thank you and good luck.
Eric Morris
President
Sheffield School of Aeronautics

1. If the ambient temperature is colder than standard at FL 310, what is the relationship between true altitude and pressure altitude?

They are both the same, 31,000 feet.
True altitude is lower than 31,000 feet.
Pressure altitude is lower than true altitude.

2. Which pressure is defined as station pressure?

Altimeter setting.
Actual pressure at field elevation.
Station barometric pressure reduced to sea level.

3. At which location does Coriolis force have the least effect on wind direction?

At the poles.
Middle latitudes (30° to 60°).
At the Equator.

4. How does Coriolis force affect wind direction in the Southern Hemisphere?

Causes clockwise rotation around a low.
Causes wind to flow out of a low toward a high.
Has exactly the same effect as in the Northern Hemisphere.

5. Which weather condition is defined as an anticyclone?

Calm.
High pressure area.
COL.

6. Which conditions result in the formation of frost?

The temperature of the collecting surface is at or below freezing and small droplets of moisture are falling.
Dew collects on the surface and then freezes because the surface temperature is lower than the air temperature.
Temperature of the collecting surface is below the dewpoint and the dewpoint is also below freezing.

7. What condition is indicated when ice pellets are encountered during flight?

Thunderstorms at higher levels.
Freezing rain at higher levels.
Snow at higher levels.

8. When will frost most likely form on aircraft surfaces?

On clear nights with stable air and light winds.
On overcast nights with freezing drizzle precipitation.
On clear nights with convective action and a small temperature/dewpoint spread.

9. What is the result when water vapor changes to the liquid state while being lifted in a thunderstorm?

Latent heat is released to the atmosphere.
Latent heat is transformed into pure energy.
Latent heat is absorbed from the surrounding air by the water droplet.

10. What is a feature of supercooled water?

The water drop sublimates to an ice particle upon impact.
The unstable water drop freezes upon striking an exposed object.
The temperature of the water drop remains at 0°C until it impacts a part of the airframe, then clear ice accumulates.

11. What is indicated about an air mass if the temperature remains unchanged or decreases slightly as altitude is increased?

The air is unstable.
A temperature inversion exists.
The air is stable.

12. What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge?

Cloud bases form.
Precipitation starts.
Stable air changes to unstable air.

13. Which process causes adiabatic cooling?

Expansion of air as it rises.
Movement of air over a colder surface.
Release of latent heat during the vaporization process.

14. When saturated air moves downhill, its temperature increases

at a faster rate than dry air because of the release of latent heat.
at a slower rate than dry air because vaporization uses heat.
at a slower rate than dry air because condensation releases heat.

15. Which condition is present when a local parcel of air is stable?

The parcel of air resists convection.
The parcel of air cannot be forced uphill.
As the parcel of air moves upward, its temperature becomes warmer than the surrounding air.

16. Convective clouds which penetrate a stratus layer can produce which threat to instrument flight?

Freezing rain.
Clear air turbulence.
Embedded thunderstorms.

17. Which type clouds are indicative of very strong turbulence?

Nimbostratus.
Standing lenticular.
Cirrocumulus.

18. What is a feature of a stationary front?

The warm front surface moves about half the speed of the cold front surface.
Weather conditions are a combination of strong cold front and strong warm front weather.
Surface winds tend to flow parallel to the frontal zone.

19. Which event usually occurs after an aircraft passes through a front into the colder air?

Temperature/dewpoint spread decreases.
Wind direction shifts to the left.
Atmospheric pressure increases.

20. What minimum thickness of cloud layer is indicated if precipitation is reported as light or greater intensity?

4,000 feet thick.
2,000 feet thick.
A thickness which allows the cloud tops to be higher than the freezing level.

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