atpl/oxford/met/ch4

Question 1

A steep pressure gradient is characterised by

Answer 1

Isobars close together, strengthened wind

Question 2

QNH at Timbuktu (200m AMSL) is 1015 hPa. What is the QFE? (Assume 1 hPa = 8m)

Answer 2

990

Question 3

In temperate latitudes in summer what conditions would you expect in the centre of a high pressure system?

Answer 3

Calm winds, haze

Question 4

If the pressure level surface bulges upwards, the pressure system is a:

Answer 4

warm, high

Question 5

The QNH at an airfield 200m AMSL is 1009 hPa; air temperature is 10°C lower than standard. What is the QFF?

Answer 5

More than 1009

Question 6

QNH is defined as:

Answer 6

QFE reduced to MSL using the standard atmosphere

Question 7

Landing at an airfield with QNH set the pressure altimeter reads:

Answer 7

The elevation of the airfield

Question 8

Airfield is 69 metres below sea level, QFF is 1030 hPa, temperature is ISA-10°C. What is the QNH?

Answer 8

More than 1030 hPa

Question 9

What is the vertical movement of air relating to a trough?

Answer 9

Converging and ascending

Question 10

What is the vertical movement of air relating to a ridge?

Answer 10

Descending and diverging

Question 11

What is subsidence?

Answer 11

Vertical down draught of air

Question 12

Aerodrome at MSL, QNH is 1022. QFF is

Answer 12

Same as QNH

Question 13

Air at the upper levels of the atmosphere is diverging. What would you expect at the surface?

Answer 13

Fall in pressure with cloud forming

Question 14

Subsidence would be described as

Answer 14

Vertical down flow of air

Question 15

You are flying at FL170. The pressure level which is closest to you is the

Answer 15

500mb

Question 16

On a surface weather chart, isobars are lines of

Answer 16

QFF

Question 17

At FL60 what pressure chart would you use?

Answer 17

800 hPa

Question 18

At which average height can the 500hPa pressure level be expected in moderate latitudes?

Answer 18

5.5 km

Question 19

The average pressure found at a height of 1620 m in mid latitudes would be?

Answer 19

850 hPa