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ATPL 50 METEOROLOGY |
| 50.07 PRESSURE SYSTEMS |
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1
During the winter months in mid-latitudes in the northern hemisphere, the polar front jet stream moves toward the
South and speed increases |
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2
The jetstream and associated clear air turbulence can sometimes be visually identified in flight by
Long streaks of cirrus clouds. |
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3
Which of the following types of jet streams can be observed all year round?
Subtropical jet stream / polar front jet stream. |
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4
In which zone of a jet
The cold air side of the core. |
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5
What is the most significant difference between an equatorial jet stream and all the other jet streams ?
W ind direction. |
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6
In the month of august you prepare a flight (cruising level fl 370) from bombay (19° n - 73° e) to bangkok (13° n - 100° e). what wind conditions can you expect? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4
Headwinds. |
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7
A wind sounding in the region of a polar front jet stream gives the following windprofile (northern hemisphere). 900hpa 220/20kt 800hpa 220/25kt 700hpa 230/35kt 500hpa 260/60kt 400hpa 280/85kt 300hpa 300/100kt 250hpa 310/120kt 200hpa 310/80kt which system is the jet stream associated with?
With a warm front. |
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8
You cross a jet stream in horizontal flight at approximately right angles. while crossing, in spite of a strong wind of 120 kt, you notice the temperature barely changes.
This phenomenon is absolutely normal as you are crossing the jet core. |
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9
Where, as a general rule, is the core of the polar front jet stream to be found?
In the warm air mass. |
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10
What is the minimum speed for a wind to be classified as a jet stream?
60 kt. |
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11
Which jet stream blows all year round, over the northern hemisphere?
The subtropical jet stream. |
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12
An aircraft over w estern europe is crossing a jet stream 2500 ft below its core at right angles. while crossing, the outside temperature is increasing. the prevailing wind is
From the right |
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13
A wind speed of 350 kt within a jet stream core should be world-wide regarded as: subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4
Possible but a very rare phenomenon. |
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14
What is the average height of the jet core within a polar front jet stream?
30000 ft. |
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15
What is the approximate ratio between height and width for a jet stream cross section?
1/100 |
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16
What is the average height of the arctic jet stream core? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4
20000 ft . |
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17
An aircraft is flying through the polar front jet stream from south to north, beneath the core. how would the oat change, in the northern hemisphere, during this portion of the flight?
It decreases. |
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18
(for this question use annex 050-3017a) what name is given to the jet stream lying across india (a) ?
Equatorial jet stream. |
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19
An aircraft is flying from south to north, above the polar front jet stream, at fl 400 in the southern hemisphere. what change, if any, in temperature will be experienced ?
It falls. |
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20
(for this question use annex 050-2541a) what name is given to the jet stream lying over north africa (b) ?
Sub-tropical jet stream |
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21
Which area of a polar front jet stream in the northern hemisphere has the highest probability of turbulence?
Looking downstream, the area to the left of the core. |
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22
While crossing a jet in western europe (3000 ft below its core) and oat is decreasing, what would be the prevailing wind?
A tailwind. |
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23
What jet streams are likely to be crossed during a flight from front jet stream. subtropical jet stream subtropical jet streams. stockholm to rio de janeiro (23° s) at fl 350 in july ?
A polar front jet stream followed by one or two |
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24
Under which of the following conditions is the most severe cat likely to be experienced ?
A curved jet stream near a deep trough |
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25
Which of the following statements concerning jet streams is correct?
In the northern hemisphere both westerly and easterly jet streams occur |
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26
Which of the following statements concerning the core of a polar front jet stream is correct ? pressure surfaces at the height of the core is at its maximum
It lies at a height where there is no horizontal temperature gradient. the slope of the |
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27
On a particular day part of a polar front jet stream runs from north to south in the northern hemisphere. this means that
The polar air is below and to the east of the core of the jet |
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28
Most strong air currents at higher levels (jet streams) have a westerly direction. there is, however, an important easterly jet stream. when and where is it likely to be encountered ?
In summer from south- east asia extending over southern india to central africa. |
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29
Which jet stream is surface front system?
The polar front jet connected with a |
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30
At approximately what altitude is the subtropical jet stream found over europe?
Fl 400 |
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31
What is the main cause for the formation of a polar front jet stream? low over iceland
The north-south horizontal temperature ground, between a high front |
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32
The equatorial easterly jet is a jet stream occurs : 45 000 ft subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4
Only in the summer of the northern hemisphere |
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33
Where, in central europe, are the highest wind speeds to be found ?
Just below the tropopause |