UPPER WIND – Air – DGCA Question Bank For Politics

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

High pressure centre at high level

Streaks of Cirrus

High level dust

Lenticularis

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

Arctic

Equatorial

Polar night

Sub tropical

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

Tropopause level

5500m

Where the air converges

Above the Alps

#4. The Arctic Jet core is at:

20,000ft

30,000ft

40,000ft

50,000ft

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

Not possible to tell without a pressure

Increases from South to North

Increases from North to South

Nothing

#6. When heading South in the Southern Hemisphere you experience Starboard drift:

You are flying towards a lower temperature

You are flying away from a lower temperature

You are flying towards a low pressure

You are flying out of a high

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

In the jet core

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

Looking downstream, on your left hand side

Looking downstream, on your right hand side

#8. Contours on a weather chart indicate:

Heights of pressure levels

Distance between pressure levels

Thickness between pressure levels

Height of ground

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

Topography of 522m above MSL

Topography of 522 decametres above MSL

Pressure is 522mb

A low surface pressure

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

North and decreases in strength

North and increases in strength

South and decreases in strength

South and increases in strength

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

Impossible

Possible but very rare

Possible in polar areas

Common

#12. 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

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

The temperature gradient runs north to south below the jet core

The temperature gradient runs north to south above the jet core

The polar air is east of the jet above the core

The polar air is below the jet to the east

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

Head

Tail

Left

Right

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

it increases

it decreases

it remains the same

impossible to determine

#16. The core of a jet stream is located

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

in the warm air where the pressure surface is horizontal

in the warm air and directly beneath at the surface

in cold air

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

1:10

1:100

1:1000

1:10000

#18. When and where does an Easterly jet stream occur?

All year through the Equator

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

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

In winter in Arctic Russia

#19. 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?

Stay level

Descend

Climb

Reduce speed

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

Its height

Its length

Its direction

Its speed

#21. Where are easterly and westerly jets found?

Northern hemisphere only

Southern hemisphere only

Northern and southern hemisphere

There are no easterly jets

#22. Wind at altitude is usually given as .......... in ..........

True, m/s

Magnetic, m/s

True, Kts

Magnetic, Kts

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

A westerly jet stream at low altitude in the summer

A curved jet stream near a deep trough

A straight jet stream near a low pressure area

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

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