Oxford, Aviation Meteorology
Pressure Systems: DGCA Aviation Meteorology questions
Highs, lows, ridges and troughs are the patterns isobars draw on a surface chart, and each comes with its typical vertical motion and weather.
There are 26 questions here, mixing chart reading from annexed charts, Q code definitions and short reductions between QFE, QNH and QFF. Exam sessions have included 2 of these.
QNH brings aerodrome pressure to sea level through the standard atmosphere, while QFF uses the actual temperature. Above sea level in air colder than ISA, QFF comes out higher than QNH, and the relationship reverses below sea level. Air sinks under a ridge and rises in a trough.
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Question 1 of 5
A steep pressure gradient is characterized by:
Question 2 of 5
QNH at Timbuktu (200 m AMSL) is 1015 hPa. What is the QFE? (Assume 1 hPa = 8 m)
Question 3 of 5
In temperate latitudes in summer what conditions would you expect in the centre of a high pressure system?
Question 4 of 5
If the pressure level surface bulges upwards, the pressure system is a:
Question 5 of 5
The QNH at an airfield 200 m AMSL is 1009 hPa; air temperature is 10°C lower than standard. What is the QFF?
21 more questions in this chapter
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