Vayudoot Aviation

1. If an Isohypse on a surface pressure chart of 500hPa shows a figure of 522, this indicates

Topography of 522m above MSL

A low surface pressure

Pressure is 522mb

Topography of 522 decametres above MSL

2. Wind at altitude is usually given as .......... in ..........

Magnetic, Kts

Magnetic, m/s

True, Kts

True, m/s

3. Contours on a weather chart indicate

Thickness between pressure levels

Height of ground

Heights of pressure levels

Distance between pressure levels

4. Where are easterly and westerly jets found?

Northern hemisphere only

Southern hemisphere only

There are no easterly jets

Northern and southern hemisphere

5. What type of jet stream blows constantly through the northern hemisphere?

Arctic

Equatorial

Sub tropical

Polar night

6. FL180, Northern Hemisphere with a wind from the left, what can you say about temperature with a heading of 360°?

Increases from North to South

Increases from South to North

Nothing

Not possible to tell without a pressure

7. When heading South in the Southern Hemisphere you experience Starboard drift

You are flying away from a lower temperature

You are flying out of a high

You are flying towards a low pressure

You are flying towards a lower temperature

8. With a polar front jet stream (PFJ), the area with the highest probability of turbulence in the Southern Hemisphere is

Above the jet core in the boundary of the warm and cold air

Looking downstream, on your left hand side

In the jet core

Looking downstream, on your right hand side

9. In central Europe, where are the greatest wind speeds?

Above the Alps

Tropopause level

5500m

Where the air converges

10. The core of a jet stream is located

in the warm air and directly beneath at the surface

in the warm air where the pressure surface is horizontal

in cold air

at the level where temperature change with altitude becomes little or nil and the pressure surface is at maximum slope

11. On a particular day the PFJ runs north to south in the Northern Hemisphere

The temperature gradient runs north to south above the jet core

The temperature gradient runs north to south below the jet core

The polar air is below the jet to the east

The polar air is east of the jet above the core

12. What is the ratio of height to width in a typical jet stream?

1:100

1:1000

1:10

1:10000

13. If you fly at right angles to a jet stream in Europe with a decreasing outside air temperature, you will experience

Increasing headwind

Increasing tailwind

Wind from the left

Wind from the right

14. When and where does an Easterly jet stream occur?

In winter in Arctic Russia

In summer from the Middle East through N. Africa and the Mediterranean to S. Spain

In summer from SE Asia through S. India to Central Africa

All year through the Equator

15. When flying from south to north in the Southern Hemisphere, you cross over the Polar Front Jet. What happens to the temperature?

impossible to determine

it decreases

it remains the same

it increases

16. The polar front jet stream in summer compared to winter in the Northern Hemisphere moves

South and decreases in strength

North and decreases in strength

South and increases in strength

North and increases in strength

17. A jet stream with a wind speed of 350kts is

Common

Impossible

Possible but very rare

Possible in polar areas

18. How do you recognise high level jet streams and associated CAT?

Lenticularis

High pressure centre at high level

High level dust

Streaks of Cirrus

19. Under which of the following circumstances is the most severe CAT likely to be experienced?

A jet stream where there is a large spacing between the isotherms

A straight jet stream near a low pressure area

A westerly jet stream at low altitude in the summer

A curved jet stream near a deep trough

20. Flying 2500 ft below core of jet, with temperature increasing in the Southern Hemisphere, where does the wind come from?

Head

Tail

Right

Left

21. The Arctic Jet core is at

20,000ft

30,000ft

40,000ft

50,000ft

22. From the pre-flight briefing you know a jet stream is at 31,000 ft whilst you are at FL270. You experience moderate C.A.T. What would be the best course of action?

Reduce speed

Stay level

Climb

Descend

23. What is most different about the Equatorial Easterly jet stream?

Its direction

Its height

Its speed

Its length

Question Bank

Questions for UPPER WIND