Meteorology

Question 0

Temperature variation is ? d° per ? ft

Answer 0

Temperature variation is 2° per 1000 ft

Question 1

ISA conditions ?

Answer 1

15° C
1013,25 hPa
1225 g/m3

Question 2

1 hPa = ? ft

Answer 2

1 hPa = 27 ft

under FL 300

Question 3

QFF is ?

Answer 3

QFF is QNH corrected with temperature

Question 4

Low pressures : altimeter ?estimate real altitude

Answer 4

Low pressures : altimeter overestimate real altitude

Question 5

Standard pressure = ? hPa

Answer 5

Standard pressure = 1013.25 hPa

Question 6

? air and ? sea level : QNH ? QFF

Answer 6

Cold air and over sea level : QNH < QFF
Reverse applies
- in warm air or
- under sea level

Question 8

Pressure altitude is ?

Answer 8

Altitude based on 1013,25 hPa

Question 9

Density altitude is ?

Answer 9

Pressure altitude (altitude based on 1013,25 hPa) corrected with temperature (4 ft per 1000 ft and per degree ISA variation)
Useless for navigation

Question 10

Correction to apply to pressure altitude (1013.25) to calculate density altitude is ?

Answer 10

120 ft per d° of ISA deviation

take-off performance calculation, f eg

Question 11

Temperature correction to find true altitude AMSL from instrumental altitude AMSL : ?
- ? ft every ? ft every ?
- or rule of thumb : ? % altitude every ?
(cold air : true ? instrumental)

Answer 11

• 4 ft every 1000 ft (QNH) every degree ISA
• or rule of thumb : 4 % altitude every 10 d° of ISA variation
  (cold air : true < instrumental)

Question 12

Maximum surface temperature is at ?

Answer 12

2 or 3 hours after mid-day

Question 13

Troposphere is from ? to ? km

Answer 13

Troposphere is from 0 to 11 km

Question 14

Minimum surface temperature is at ?

Answer 14

30 mn after sunrise

Question 15

ISA above ? is ? d°

Answer 15

ISA above FL360 is - 56.5°

or 11 km

Question 16

Atmosphere temperature variations :

• from ? to ? variation is ?
• from ? to ? variation is ?
• from ? to ? variation is ?

Answer 16

• from 0 to 11 km : 2° / 1000 ft decrease
• from 11 km to 20 km : constant temp -56,5°
• from 20 km to 32 km : 0,3° / 1000 ft increase

Question 19

Composition of atmosphere ?

Answer 19

78% nitrogen
21% oxygen
Rest others
(idem at every altitude)

Question 20

Mean high of tropopause :

• poles : ? km
• mid latitudes : ? km
• equator : ? km

Answer 20

• poles : 8 km
• mid latitudes : 11 km (known)
• equator : 16 km (double of poles)

Question 21

In VOLUME, % of vapour in tropopause ?

Answer 21

From 0 to 4%

Question 22

Typical pressures
FL 50 = ? hPa
FL 100 = ? hPa
FL 180 = ? hPa
FL 300 = ? hPa
FL 380 = ? hPa

Answer 22

FL 50 = 850 hPa
FL 100 = 700 hPa
FL 180 = 500 hPa
FL 300 = 300 hPa
FL 380 = 200 hPa

Question 23

In colder than ISA air, true altitude is ? than indicated altitude

Answer 23

In colder than ISA air, true altitude is lower than indicated altitude

Question 24

ISA temperature at different altitudes? (rule of thumb)

Answer 24

Temperature = - altitude x 2 - 15

and temp at FL 380 = - 56,5° (constant)

Question 25

Half of the mass of the atmosphere is found ?

Answer 25

below about 5 km

Question 26

Tropopause temperatures :

• poles ?
• mid latitudes ?
• equator ?

Answer 26

• poles : - 35°
• mid latitudes - 55°
• equator - 75°