The international standard atmosphere assumes a lapse rate of
2ºC/1000 ft
1,5ºC/ 1000 ft
3ºC/1000 ft
1,98ºC/1000 ft
The tropopause is:
The line where the temperature no longer decreases with increase of height.
The layer between the tropopause and the stratosphere
The layer beyond which only CI cloud occurs.
The line indicating clear air turbulence
One of the most important characteristics of the atmosphere is:
Density is constant above 10000 ft
The air is a poor conductor of heat
Temperature lapse rate is very frequently above 3ºC per 1000 ft.
The air is a good conductor of heat
Most of the vapour in the atmosphere is contained in the:
tropopause
stratosphere
troposphere
stratopause
The captain of an aircraft needs to know the height of the tropopause because:
it normally represents the limit of weather
density starts to increase
there are no longer jet streams and CAT
it indicates the height of the thermal wind
The main Ozone layer is to be found in the:
termosphere
mesosphere
The level in the atmosphere where the air temperature ceases to fall with increase in height is known as:
The troposphere
The stratopause
The stratosphere
The tropopause
Which statement is correct when considering the lower layers of the atmosphere:
the majority of the weather is contained in the stratosphere and its upper boundary is the tropopause
the majority of the weather is contained in the troposphere and its upper boundary is the tropopause
the majority of the weather is contained in the tropopause and its upper boundary is the troposphere
the majority of the weather is contained in the troposphere and its upper boundary is the stratosphere
The atmosphere is a mixture of gases of the following proportions:
oxygen 21% nitrogen 78% other gases 1%
oxygen 21% hydrogen 78% other gases 1%
nitrogen 78% argon 21% oxygen 1%
nitrogen 78% oxygen 21% hydrogen 1%
In the ISA the temperature is isothermal:
Up to 36090 ft/11 kms
From 36090 ft/11kms to 65617 ft/20 kms.
From 36090 ft/11kms to 104987 ft/32 kms.
From 36090 ft/11kms to 45090 ft/13.75 kms.
The international (ICAO) Standard Atmosphere assumes that the sea level atmospheric pressure is:
1013,25 mbs and decreases with an increase in height.
1013,25 mbs and increases with an increase in height.
1013,25 mbs and falls to about half this value at 30000 ft
1013,25 mbs and decreases with an increase in height up to the tropopause. Above the tropopause it remains constant.
At sea level the ISA density is stated to be:
1225 grammes per cubic metre
1252 grammes per cubic metre
1013,2 mb (hPa)
29,6 inches of mercury
Which of the following statements is most correct when describing ISA:
the MSL pressure is 1013,25 mbs and the temperature is +15ºC
the MSL pressure is 1013,25 mbs and the temperature is +15ºC with a lapse rate of 1,98ºC/1000 ft
the MSL pressure is 1013,25 mbs and the temperature is +15ºC with a lapse rate of 1,98ºC/1000 ft up to 36090 ft above which there is frequently an inversion
the MSL pressure is 1013,25 mbs and the temperature is +15ºC with a lapse rate of 1,98ºC/1000 ft up to 36090 ft
The following is true for the International Standard Atmosphere:
at mean sea level the following conditions prevail: Temperature +15ºC, pressure 1013,25 hpa, density 1125 gm/m3
within the troposphere the temperature decreases by 6,5ºC per km
the tropopause is at a height of 36090 AGL
the temperature at the tropopause is 226,5 ºK
Pressure _____ with increase of height and in the ISA pressure will be _____ at 10000 ft and _____ at 30000 ft.
Increase/800mb/400mb
Decrease/700mb/300mb
Increase/200mb/800mb
Decrease/500mb/200mb
