The Atmosphere

Question 1

Most weather occurs in which layer of the atmosphere

Answer 1

TROPOSPHERE

Question 2

What layer is immediately above the Troposphere

Answer 2

TROPOPAUSE

Question 3

The layer of atmosphere in which most flying occurs

Answer 3

STRATOSPHERE

Question 4

Where is the Tropopause higher;
1. Poles
2. Equator

Answer 4

EQUATOR

Question 5

In feet and kilometers

The height of the tropopause at the poles

Answer 5

1. 30,000 ft
2. 9 km

Question 6

In feet and kilometers

The height of the tropopause at the equator

Answer 6

1. 60,000 ft
2. 18 km

Question 7

As per the ICAO ISA standards, the Troposphere is up to ____ ft or ____ km

Answer 7

1. 36,090 ft
2. 11 km

Question 8

What is the temperature lapse rate in ℃ per km

Answer 8

-6.5 ℃ per km

Question 9

As per the ICAO ISA standards, the Tropopause starts at ____ ft or ____ km

Answer 9

1. 36,090 ft
2. 11 km

Question 10

What is the upper limit of ICAO ISA;
1. ____ ft
2. ____ km

Answer 10

1. 66,617 ft
2. 20 km

Question 11

At what height in km does the stratosphere begin

Answer 11

32 km

Question 12

How much of each gas in the atmosphere

Nitrogen
Oxygen
Other

Answer 12

Nitrogen - 78%
Oxygen - 21%
Other - 1%

Question 13

As pressure, temperature or altitude change, what happens to the proporitions of the gases in the atmosphere

Answer 13

REMAIN CONSTANT

Nitrogen - 78%
Oxygen - 21%
Other - 1%

Question 14

What is the definition of atmopsheric pressure

Answer 14

Weight of air on the surface by gravity

Question 15

What does atmospheric pressure decrease as altitude increases

Answer 15

Less air above
Less air weighs less, meaning less pressure

Question 16

What is the pressure of the following flight levels?

Sea Level
5000
10,000
20,000
30,000
35,000

Answer 16

Sea Level - 1013
5000 - 840
10,000 - 700
20,000 - 466
30,000 - 300
35,000 - 240

Question 17

What is the term use when the temperature in the tropopause is constant

Answer 17

ISOTHERMAL

Question 18

Assuming ISA conditions

What is the constant temperature at the tropopause

Answer 18

-56.5℃

Question 19

What are the values of ISA lapse rates?

Temperature lapse rate
Pressure reduction (up to ????? ft)

Answer 19

Temperature: -1.98 C per 1000 ft
Pressure: 1 hPa per 30 ft up to 20,000 ft

Question 20

What are 4 reasons a “standard atmosphere” defined

Answer 20

1. Aircraft performance calculations
2. Standard seperation
3. Expected temperatures at altitudes
4. Baseline to calculate forecasts against

Question 21

What are the values of ISA at sea level?

1. Temperature
2. Density
3. Pressure

Answer 21

1. Temperature - 15 C
2. Density - 1.225 kg/m^3
3. Pressure - 1013.25 hPa

Question 22

What is the Conversion;

hPa → inHg

Answer 22

1 hPa = 0.0295 inHg

If you have 1013.25 hPa, 1013.25 x 0.0295 = 29.89 inHg

Question 23

What is the Conversion;

inHg → hPa

Answer 23

1 inHg = 33.86 hPa

If you have 15 inHg, 15 x 33.86 = 507.9 hPa

Question 24

What is the Conversion;

℃ → ℉

Answer 24

Farenheit = (℃ x 1.8) + 32

Question 25

What is the Conversion;

℉ → ℃

Answer 25

Celcius = ( Fahrenheit - 32 ) / 1.8

Question 26

MORE or LESS

Water vapour is ____ dense than dry air

Answer 26

LESS DENSE

Question 27

MORE or LESS

Humid air weights ____ than dry air

Answer 27

LESS