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DGCA QUESTION BANK FOR PILOTS
Practice until you score 100 %
UPPER WIND
#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 leve
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
FINISH
