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Part 107 Weather Flashcards

1
Q

Standard air temperature and pressure at sea level

A

15 degrees Celsius at 29.92 inches of Mercury

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2
Q

The height an object is at above ground level. That is, you could be at 2000 feet MSL but when you’re drone is still on the ground, you and the drone are at 0 AGL.

A

Absolute altitude

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3
Q

The height of an object or location above MSL. It is the actual level above sea level you and your drone are at. So if you are launching at 2000 feet MSL then 2000 feet MSL Is your….altitude

A

True altitude

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4
Q

The height or altitude your altimeter displays. Regarding drone flight, most altimeters assume you are at sea level under standard conditions, where ——— altitude is the same as true altitude

A

Indicated altitude

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5
Q

The indicated altitude when the barometric pressure scale is set to 29.92 inches of Mercury. It doesn’t determine temperature

A

Pressure altitude

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6
Q

The pressure altitude corrected for non standard temperature. The altitude that we’ve said that the drone feels like it’s flying

A

Density altitude

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7
Q

A hot humid day would have this affect on an drone

A

May accelerate more slowly or may need to move faster making it more difficult for the drone to climb

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8
Q

What type of air does high density altitude refer to

A

Thin air

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9
Q

What type of air does low density altitude refer to

A

Dense air

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10
Q

You will experience reduced aircraft performance in what type of density altitude

A

High density altitude

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11
Q

You will have stronger performance in what type of density altitude

A

Lower density altitude

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12
Q

Higher density altitude means thinner air and results in ————drone performance

A

Reduced drone performance

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13
Q

Lower density altitude means thicker dense air and ————- performance

A

Stronger

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14
Q

The climb performance of an drone ————— with altitude

A

Diminishes with altitude

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15
Q

———/- currents are the forces that cause bumpy turbulent air when flying at lower altitudes during warmer weather

A

Convective currents

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16
Q

Every change in weather is the direct result of

A

A heat exchange

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17
Q

Stable air tends to produce

A

Stratiform clouds
Smooth air
Fair to poor visibility with haze and smoke
Continuous precipitation

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18
Q

Unstable air tends to produce

A

Cumuliform clouds
Turbulent air
Good visibility
Showery precipitation

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19
Q

Air mass that brings cool dry air. It forms over ———regions

A

Polar air mass

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20
Q

An air mass that brings warm moist air. It forms over ———- waters

A

Tropical air mass

21
Q

Air mass that causes good surface visibility but has turbulence, cumulus clouds, and showers

A

Unstable air mass

22
Q

This weather front brings low ceilings, poor visibility, and rain, move slowly

A

Warm front

23
Q

This weather front brings sudden storms, gusty winds, turbulence, and sometimes hail or tornadoes , move quickly

A

Cold front

24
Q

———- can occur at any altitude. Can affect flight at any altitude

A

Wind shear

25
Q

The changing of liquid water to water vapor is called

A

Evaporation

26
Q

The changing of ice to water vapor bypassing the liquid stage is

A

Sublimation

27
Q

These are the most dangerous type of cloud appearing individually or in groups as either air mass or orographic thunderstorms . Think marshmallows

A

Cumulonimbus clouds

28
Q

Nimbus means

A

Rain

29
Q

These clouds are formed by barriers in the wind flow and are most prevalent around mountaintops. Often called standing clouds. They are good indication of strong turbulence and should be avoided

A

Lenticular

30
Q

What is the most violent time of a thunderstorms life cycle

A

Mature stage

31
Q

You must operate at least ——-feet below clouds

A

500 feet

32
Q

How to reach the cloud base AGL

A

Temperature minus dew point is spread. Divide the spread by 4.4 if temperatures are in farenheit or 2.5 if temps are in Celsius and then multiply by 1000 for the cloud base AGL

33
Q

What is a characteristic of stable air?
Cumulus nimbus clouds
Stratiform clouds
Unlimited visibility

A

Stratiform clouds

34
Q

What are the characteristics of a moist unstable air mass?

Poor visibility and smooth air

Cumuliform clouds and showery precipitation

Stratiform clouds and showery precipitation

A

Cumuliform clouds and showery precipitation

35
Q

If an unstable air mass is forced upward what type of clouds can be expected?

1) clouds with considerable vertical development and associated turbulence
2) cumulus clouds with little vertical development
3) stratus clouds with considerable associated turbulence

A

Clouds with considerable vertical development and associated turbulence

36
Q

A stable air mass is likely to have which characteristic

Turbulent air

Showery precipitation

Poor surface visibility

A

Poor surface visibility

37
Q

Moisture is added to air by

Evaporation and sublimation

Evaporation and condensation

Sublimation and condensation

A

Evaporation and sublimation

38
Q

Which combination of atmospheric conditions will reduce aircraft takeoff and climb performance?

1) high temperature, low humidity, low density altitude
2) high temp, high humidity and high density altitude
3) low temp, low humidity, and low density altitude

A

High temp, high humidity, high density altitude

39
Q

What effect does high density altitude have on a propeller?

1) efficiency is increased
2) density altitude does not effect propeller efficiency
3) propeller efficiency is decreased

A

Propeller efficiency is decreased

40
Q

Generally for aircraft the most hazardous kind of thunderstorm is

Stratiform thunderstorm

Squall line thunderstorm

Warm front thunderstorm

A

Squall line thunderstorm

41
Q

What should you expect if you see lenticular clouds over a mountain?

Light to moderate precipitation

Strong turbulence

The beginning of a thunderstorm

A

Strong turbulence

42
Q

Which is formally defines as “pressure altitude corrected for nonstandard temperature variations”

True altitude

Pressure altitude

Density altitude

A

Density altitude

43
Q

What is the indicated altitude when your altimeter is set to 29.92

Density altitude

Indicated altitude

Pressure altitude

A

Pressure altitude

44
Q

What is the standard air temperature and pressure at sea level?

32 degrees Celsius and 30.00 hg

15 degrees Celsius and 29.92 hg

98.6 degrees

A

15 degrees Celsius and 29.92 hg

45
Q

In a metal report what does BR indicate

A

Must

46
Q

TAFs are typically valid for

A

24 or 30 hour time period

47
Q

To obtain a complete weather overview for a planned flight the remote pilot in command should obtain

A

Standard briefing

48
Q

Which weather service provides current recorded weather information

A

ATIS automated weather reporting

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