MET Q3 - Atmospheric Pressure Flashcards
What units of measurement are used to describe pressure in aviation?
(select one)
Hectopascals (hPa)
Bar (Psi)
QFE
Kelvin
Hectopascals (hPa)
On a synoptic chart, a pattern of isobars extending from a high pressure area is
(select one)
Ridge
Col
Anti-cyclone
Trough
Ridge
On a synoptic chart, an elongation of isobars extending from a low pressure area is
(select one)
Trough
Col
Anti-cyclone
Ridge
Trough
In the Troposphere the decreases in pressure per 100m increase in height is:
(select one)
a.Greater in the lower layers than in the higher layers
b.Greater than in the higher layers than in the lower layers
c.In the order of 27hPa per 100m in the friction layer
d.Always greater in a high pressure area than in a low pressure area
a.Greater in the lower layers than in the higher layers
What will affect the pressure lapse rate i.e. the thickness between pressure levels?
(select one)
Temperature
Humidity
Clouds
Turbulence
Temperature
What is the approximate percentage density of the atmosphere at 40,000ft compared to mean sea level?
(select one)
- 75%
- 50%
- 25%
- 40%
- 25%
The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QNH?
(select one)
a.More than 1016 hPa
b.It is not possible to give a definitive answer
c.1016 hPa
d.Less than 1016 hPa
a.More than 1016 hPa
What do the values on a synoptic (surface pressure chart) represent?
(select one)
a.QNE
b.QFF
c.QNH
d.QFE
b.QFF
The lines on a meteorological surface chart join places having the same
(select one)
1.QNH
2.QFE
3.QFF
4.QNE
3.QFF
In temperate latitudes in summer what weather conditions would you most often associate with a high pressure system?
(select one)
a.calm winds, haze
b.Dense cloud
c.Showers
d.Thunderstorms
a.calm winds, haze
