Index - Atpl Campus

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1-The air mass in the warm sector of a polar front is:

050 12836 Uncategorized Wind

equatorial air. polar air. tropical air. arctic air.

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2-What cloud cover is typical for a wide warm sector of a polar front depression over Central Europe in the summer ?

050 1600 Air Masses and Fronts

Fair weather CU ST with drizzle Sky clear BKN CU and CB

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3-How do air masses move at a warm front ?

050 1597 Air Masses and Fronts

Warm air overrides a cold air mass Warm air undercuts a cold air mass Cold air overrides a warm air mass Cold air undercuts a warm air mass

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4-Cold front undercuts the warm air because of;

050 1

Steep front angle. High density. High wind speed. Warm air.

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5-An aircraft is approaching a cold front from the warm air mass side at FL 270 and experiencing moderate to severe turbulence. A jet stream is forecast to be at FL 310. The shortest way to get out of this turbulence is by:

050 2171 Flight Hazards

Climbing Descending Maintain FL 270 Turn right

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6-The polar front is

050 16783 Air Masses and Fronts

the boundary between polar and tropical air masses. the boundary between arctic and polar air masses. the boundary between arctic and tropical air masses. the constant frontal activity situated at about 80 degrees north and south.

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7-The warm sector is indicated by:

050 13673 Uncategorized Wind

number 2 number 1 number 4 number 3

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8-What is the surface visibility most likely to be in a warm sector of maritime tropical air during a summer afternoon in western Europe?

050 1274 Wind Uncategorized

Moderate (several km). Good (greater than 10 km). Very good (greater than 50 km). Very poor (less than 1 km).

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9-Where is the projection of the polar front jet stream on the surface most likely to be found in relation to the cold and warm fronts of a depression?

050 12801

50 to 200 NM behind the cold front and 300 to 450 NM ahead of the warm front 300 to 450 NM behind the cold front and 50 to 200 NM ahead of the warm front Up to 100 NM either side of the cold front and up to 200 NM either side of the warm front Up to 200 NM either side of the cold front and up to 200 NM either side of the warm front

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10-In a warm front occlusion

050 4096 Uncategorized Wind

the cold air is lifted the warm front becomes a front aloft the warm air is lifted the warm front overtakes the cold front

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11-If you have to fly through a warm front when freezing level is at 10000 feet in the warm air and at 2000 feet in the cold air, at which altitude is the probability of freezing rain the lowest ?

050 2177 Air Masses and Fronts

3000 feet 12000 feet 5000 feet 9000 feet

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12-In case of fronts, what cloud formation is most likely to occur at low levels when a warm air mass overrides a cold air mass?

050 1266 Air Masses and Fronts

Altostratus. Cumulonimbus. Cumulus. Nimbostratus.

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13-The polar front is the boundary between:

050 1201 Air Masses and Fronts

polar air and tropical air. maritime polar air and continental polar air. arctic air and polar air. arctic air and tropical air.

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14-The approximate inclined plane of a warm front is:

050 1267 Air Masses and Fronts

1/50 1/500 1/150 1/300

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15-Thunderstorms can occur on a warm front if the

050 4119 Flight Hazards

cold air is moist and the environmental lapse rate exceeds the saturated adiabatic lapse rate warm air is moist and the environmental lapse rate is less than the saturated adiabatic lapse rate warm air is moist and the environmental lapse rate exceeds the saturated adiabatic lapse rate cold air is moist and the environmental lapse rate is less than the dry adiabatic lapse rate

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16-On an aerodrome, when a warm front is approaching

050 2717 Air Masses and Fronts

QFE and QNH decrease. QFE decreases and QNH increases. QFE and QNH increase. QFE increases and QNH decreases.

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17-What type of weather can usually be expected in a polar maritime air mass over central Europe in the daytime during summer?

050 12818 Wind Uncategorized

Drizzle and low stratus. Continuous rain and poor visibility. Sky clear. Showers and good visibility.

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18-What type of weather can usually be expected in a polar maritime air mass over Central Europe in the daytime during summer?

050 15786 Air Masses and Fronts

Continuous rain and poor visibility. Sky clear. Showers and good visibility. Drizzle and low stratus.

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19-An air mass is:

050 13652 Air Masses and Fronts

a large body of air with temperature and humidity constant in the vertical. a large body of air within which the temperature and humidity is uniform in horizontal and vertical planes. an extensive body of air within which the temperature and humidity in horizontal planes are practically uniform. a body of air with a volume of not more than thousand cubic kilometres.

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20-An occlusion has the characteristics of a warm front when:

050 10865 Air Masses and Fronts

the cold air ahead is lifted the cold air behind is colder than the cold air ahead the cold air behind is lifted by the warm air the cold air behind is warmer than the cold air ahead

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21-At a station at the surface the significant weather with a warm front will come:

050 13669 Air Masses and Fronts

after the warm sector has passed. after the front has passed. mostly before the front passes. only at the same time as the front passes.

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22-Thunderstorms in exceptional circumstances can occur in a warm front if

050 2715 Air Masses and Fronts

the warm air is unstable. the warm air is stable. the cold air is unstable. the cold air is stable.

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23-The slope and speed of a warm front compared to the slope and speed of a cold front is in general:

050 13609 Air Masses and Fronts

smaller and slower. greater and slower. smaller and faster. greater and faster.

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24-Which of the following statements is correct concerning the weather in a warm sector?

050 16502 Air Masses and Fronts

Isolated air mass thunderstorms are common during all seasons over continental areas Isolated thunderstorms are sometimes possible over continental areas during the summer In mid- and high latitudes thunderstorms may occur only over open sea during the summer No thunderstorms can occur

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25-What is necessary for the development of a polar front jet stream?

050 13630 Wind

An unstable atmosphere up to great heights. Strong horizontal temperature gradients. Strong vertical temperature gradients. A uniform pressure pattern.

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26-The core of the polar front jet stream is usually located in the

050 10124 Wind

tropical air above the tropical tropopause polar air above the tropopause tropical air below the tropopause polar air below the tropopause

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27-The average position of the polar front in the northern hemisphere is:

050 13813 Wind Uncategorized

located near 65°N during the whole year. more southerly during the summer than during the winter. located near 55°N during the whole year. more southerly during the winter than during the summer.

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28-The average position of the polar front in the northern hemisphere is:

050 14881 Uncategorized Wind

located near 55°N during the whole year. more southerly during the summer than during the winter. located near 65°N during the whole year. more southerly during the winter than during the summer.

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29-Where would you expect polar front depressions?

050 1

When flying over ITCZ (Intertropical convergence zone) When flying over Europe When flying over tropopause When flying over Kenya

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30-In the northern hemisphere advection of warm air aloft indicates:

050 13649 Air Masses and Fronts

backing winds with increasing heights. the formation of advection fog. increasing probability for showers. the approach of a warm occlusion.

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31-An occlusion is called a warm occlusion when the cold air

050 13665 Air Masses and Fronts

at the rear of the occlusion is less cold than the cold air ahead, with the warm air at a higher altitude. ahead of the surface position of the occlusion is only at a higher altitude. at the rear of the occlusion is colder than the cold air ahead, with the warm air at a higher altitude. at the rear of the occlusion is colder than the cold air ahead.

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32-When in the upper part of a layer warm air is advected the

050 4026 The Atmosphere

wind speed will always decrease with increasing height in the northern hemisphere stability increases in the layer wind will back with increasing height in the northern hemisphere stability decreases in the layer

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33-When warm air moves over a colder surface, __________.

050 1

it rises. it becomes unstable. it becomes stable. it produces thunderstorms.

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34-An air mass is stable when

050 4149 Wind Uncategorized

the lapse rate is 1°C per 100 m temperature in a given area drops off very rapidly with height pressure is constant lifted air returns to its original level

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35-An air mass is unstable when

050 4148 Uncategorized Wind

temperature increases with height pressure shows a marked variation over a given horizontal area temperature and humidity are not constant an ascending parcel of air continues to rise to a considerable height.

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36-Where does polar continental air originate?

050 1255 Uncategorized Wind

The region of the British Isles. Polar ice cap. Siberian landmass. The region of the Azores.

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37-On the approach, the surface temperature is given as -5°C. The freezing level is at 3000 FT/AGL. At 4000 FT/AGL, there is a solid cloud layer from which rain is falling. According to the weather briefing, the clouds are due to an inversion caused by warm air sliding up and over an inclined front. Would you expect icing?

050 2049 Flight Hazards

Yes, but only between 3000 and 4000 FT/AGL. No, absolutely no icing will occur. Yes, between ground level and 3000 FT/AGL. No, flights clear of cloud experience no icing.

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38-For an airfield located in the British Isles, the passage of a warm front will usually be indicated by

050 10883 Air Masses and Fronts

rapid improvement in visibility, pressure falling rapidly, wind veering and increasing rise in temperature, rapid rise in pressure, wind backs and becomes gusty a fall in temperature, rise in dew point temperature, wind backing and decreasing rise in temperature, rise in dew point temperature, wind veers and decreases

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39-Which type of precipitation is the most dangerous at the time of warm front?

050 1

Drizzle Freezing rain Snow Hail

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40-Where, as a general rule, is the core of the polar front jet stream to be found?

050 12800 Uncategorized Wind

In the polar air mass. Just below the cold-air tropopause. In the tropical air mass. Just above the warm-air tropopause.

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41-In which zone of a polar front jet stream is the strongest CAT to be expected ?

050 13463 Uncategorized Wind

Exactly in the centre of the core. On the tropical air side of the core. About 12000 FT above the core. On the polar air side of the core.

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42-Where is the wind speed of a polar front jet stream normally at its strongest?

050 16307 Wind

In the area between a trough and a ridge. In the area where the jet stream is curving around an anticyclone. In the area of a trough. In the area where the jet stream is curving around a depression.

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43-What is the main cause for the formation of a polar front jet stream?

050 1580 Wind

The varied elevations of the tropopause in the polar front region Strong winds in the upper atmosphere The north-south horizontal temperature gradient at the polar front The pressure difference, close to the ground, between a high over the Azores and a low over Iceland

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44-What is the average height of the jet core within a polar front jet stream?

050 1565 Wind

30000 FT. 50000 FT. 20000 FT. 40000 FT.

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45-In which main direction does a polar front depression move?

050 1603 Air Masses and Fronts

Across the front towards the north Across the front towards the south Along the front towards the east Along the front towards the west

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46-Where, as a general rule, is the core of the polar front jet stream to be found?

050 2008 Uncategorized Wind

In the polar air mass. Just below the cold-air tropopause. Just above the warm-air tropopause. In the tropical air mass.

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47-In which zone of a polar front jet stream is the strongest CAT to be expected ?

050 1983 Wind Uncategorized

On the tropical air side of the core. About 12000 FT above the core. On the polar air side of the core. Exactly in the centre of the core.

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48-Which of the following statements concerning the core of a polar front jet stream is correct ?

050 4173 Wind

It lies in the cold air; the wind reverses direction at the height of the core It lies at a height where there is no horizontal temperature gradient; the slope of the pressure surfaces at the height of the core is at its maximum It lies in the warm air; its pressure surfaces are horizontal at the height of the core It and its surface projection lie in the warm air

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49-Which statement concerning the cold front and warm front of a frontal depression in the northern hemisphere is correct?

050 13827 Air Masses and Fronts

The wind backs more at the warm front than at the cold front. While occluding the warm front always becomes a front aloft. The risk of fog is greater ahead of and behind the warm front than ahead of and behind the cold front. The precipitation zone of the cold front is in general wider than the precipitation zone of the warm front.

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50-Over Central Europe what type of cloud cover is typical of the warm sector of a depression during winter?

050 1272 Air Masses and Fronts

ST. CI, CS. CU, CB. Fair weather CU.

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51-Your planned route lies within a warm sector of a depression which would suggest:

050 1

Poor visibility both above and below extensive stratus cloud. Good visibility above and below extensive stratiform cloud. Poor visibility above stratus cloud but moderate to good visibility below. Good visibility below scattered cumuliform cloud.

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52-Advection of very cold air over a warm sea current can cause:

050 13657 Clouds and Fog

frontal fog. no fog at all. steaming fog. advection fog.

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53-When warm moist air moves over a colder surface, __________.

050 1

it becomes unstable. it rises. it may produce fog and visibility may reduce. it may produce convective clouds and turbulence.

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54-An unstable air mass will normally be characterised by

050 10866 Air Masses and Fronts

stratiform cloud continuous light rain from medium level layer cloud poor visibility due to haze at the lower levels cumuliform cloud and good visibility except in precipitation

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55-An air mass is called stable when

050 3730 Wind Uncategorized

the environmental lapse rate is high, with little vertical motion of air currents the pressure in a given area is constant the temperature in a given air mass decreases rapidly with height the vertical motion of rising air tends to become weaker and disappears

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56-In which of the following regions does maritime polar air originate?

050 1595 Wind Uncategorized

East of Greenland Baltic Sea Black Sea Region of British Isles

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57-Which of the following statements is correct concerning the typical weather in a warm sector in mid- and high latitudes over continental areas during summer?

050 14880 Air Masses and Fronts

Overcast by medium and high clouds, stratus with drizzle, poor visibility Moderate to poor visibility, fog or stratus, stratocumulus and drizzle Generally moderate to good visibility, haze, sometimes few or scattered cumulus Generally good visibility outside the frequent showers of CBs

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58-The passage of a warm front can be associated with areas of fog. The types of fog just in advance and just after the passage are respectively

050 10925 Air Masses and Fronts

advection fog and steaming fog advection fog and radiation fog arctic smoke and frontal fog frontal fog and advection fog

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59-What types of cloud will you see flying at FL 50 towards a warm front?

050 1095 Air Masses and Fronts

At some 800 km CS, later AS, and at some 300 km NS until the front At some 500 km AS, later CS and at some 80 km before the front CB At some 500 km from the front, groups of CB, later at some 250 km thickening AS Mainly clear skies. At some 100 km from the front NS begins

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60-Which of the following conditions are you most likely to encounter when approaching an active warm front at medium to low level ?

050 1264 Air Masses and Fronts

Severe thunderstorms at low altitude. Low cloud base and poor visibility. High cloud base, good surface visibility, and isolated thunderstorms. Extreme turbulence and severe lightning striking the ground.

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61-Ahead of a warm front (northern hemisphere) the wind direction changes from the surface up to the tropopause. The effect of this change is that the wind

050 4075 Uncategorized Wind

backs in the friction layer and veers above the friction layer backs in the friction layer and backs above the friction layer veers in the friction layer and backs above the friction layer veers in the friction layer and veers above the friction layer

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62-The main factor which contributes to the formation of very low clouds ahead of a warm front is the

050 4045 Air Masses and Fronts

saturation of the warm air by rain falling into it and evaporating warm air moving over a cold surface saturation of the cold air by rain falling into it and evaporating reduction of outgoing radiation due to clouds

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63-Seen from the surface, the passage of a warm front is characterized by which of the following cloud types?

050 1

Cirrostratus, Cirrocumulus, Altostratus, Nimbocumulus, Stratus. Cirrostratus, Cirrocumulus, Cumulus, Nimbostratus, Fractostratus. Cirrus, Cirrocumulus, Altocumulus, Altostratus Cumulus, Cumulus Fractus Cirrus, Cirrostratus, Altostratus, Nimbostratus, Stratus.

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64-Which of the following combinations is most characteristic of unstable air behind a cold front?

050 15955 Air Masses and Fronts

Poor visibility, intermittent precipitation, cumuliform clouds Good visibility between showers, showery precipitation, cumuliform clouds Poor visibility, continuous precipitation, stratiform clouds Good visibility between showers, persistent precipitation, stratiform clouds

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65-What is the relative movement of the two air masses along a cold front ?

050 1599 Wind Uncategorized

Cold air slides over a warm air mass Warm air pushes over a cold air mass Warm air pushes under a cold air mass Cold air pushes under a warm air mass

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66-Where is the coldest air to be found, in an occlusion with cold front characteristics?

050 1270 Air Masses and Fronts

Ahead of the front. Behind the front. At the junction of the occlusion. At the surface position of the front.

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67-Where is the cold air in an occlusion that has the characteristics of a cold front?

050 1

After the occlusion Behind the front Ahead of the front At the front

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68-Which of the following processes will increase the stability of an air mass?

050 12794 Uncategorized Wind

Warming of the air mass from below. Cooling by the underlying surface. Advection of colder air aloft. Addition of water vapour in the lower layer.

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69-The air mass affecting position "R" is most likely to be

050 13620

Continental tropical. Maritime tropical. Maritime polar. Continental polar.

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70-The air mass affecting position "A" is most likely to be

050 13614 Wind Uncategorized

Maritime polar. Continental tropical. Maritime tropical. Continental polar.

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71-The air mass affecting position "P" is most likely to be

050 13621 Air Masses and Fronts

Continental polar. Maritime tropical. Maritime polar. Continental tropical.

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72-The air mass affecting position "C" is most likely to be

050 13623 Uncategorized Wind

Continental polar. Maritime tropical. Maritime polar. Continental tropical.

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73-The air mass affecting position "S" is most likely to be

050 13632 Meteorological Information

Maritime tropical and stable. Continental tropical and unstable. Maritime polar and stable. Maritime polar and unstable.

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74-The air mass at position "X" is most likely to be

050 13567 Air Masses and Fronts

Continental tropical. Maritime tropical. Continental polar. Maritime polar.

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75-Which of the following processes will increase the stability of an air mass?

050 15594 Wind Uncategorized

Cooling by the underlying surface. Advection of colder air aloft. Warming of the air mass from below. Addition of water vapour in the lower layer.

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76-An air mass acquires its basic properties

050 13661 Air Masses and Fronts

in the westerlies of the mid-latitudes by stagnation of the air for a long period of time over areas having particular characteristics by the influence of jet streams by widespread thunderstorms

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77-In which air mass are extremely low temperatures encountered?

050 13679 Uncategorized Wind

Continental tropical air. Continental polar air. Maritime arctic air. Maritime polar air.

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78-In which air mass are extremely low temperatures encountered?

050 1256 Wind Uncategorized

Maritime arctic air. Continental polar air. Maritime polar air. Continental tropical air.

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79-The actual change of the temperature in the air mass with height is known as:

050 1

The actual lapse rate (LR) The temperature curve The environmental lapse rate (ELR) The adiabatic lapse rate (ALR)

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80-Which area of a polar front jet stream in the northern hemisphere has the highest probability of turbulence?

050 10959 Wind

Looking downstream, the area to the right of the core. In the core of the jet stream. Above the core in the boundary between warm and cold air. Looking downstream, the area to the left of the core.

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81-The reason for the fact, that the atmospheric pressure of a polar front depression is normally lower in winter than in summer is that

050 4260 Climatology

the strong winds of the north Atlantic in winter are favourable for the development of lows. the low pressure activity of the sea east of Canada is higher in winter. converging air currents are of greater intensity in winter. the temperature contrasts between arctic and equatorial areas are much greater in winter.

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82-Considering the North Atlantic between 30°N and 65°N, the mean position of the polar front during winter extends from

050 10875 Meteorological Information

NE Canada to Portugal Newfoundland to Iceland Iceland to Norway Florida to SW England

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83-At which time, if any, are polar front jet streams over the South Pacific usually strongest?

050 10869 Wind

January July October There is no annual variation

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84-In relation to the polar front jet stream, the greatest rate of wind shear is most likely to occur

050 10896 Wind

5000 FT or more above the core on the tropical side of the core well below the core close to the core on the polar side

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85-From summer to winter the average geographic position of the polar front jet stream over the North Atlantic moves

050 10886 Wind

towards the north and the speed increases towards the north and the speed decreases towards the south and the speed decreases towards the south and the speed increases

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86-Which area of a polar front jet stream in the northern hemisphere has the highest probability of turbulence?

050 2047 Wind

In the core of the jet stream. Above the core in the boundary between warm and cold air. Looking downstream, the area to the right of the core. Looking downstream, the area to the left of the core.

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87-During the winter months in mid-latitudes in the northern hemisphere, the polar front jet stream moves toward the

050 2173 Wind

north and speed increases south and speed decreases north and speed decreases south and speed increases

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88-On a particular day part of a polar front jet stream runs from north to south in the northern hemisphere. This means that

050 4174 Wind

above the core of the jet the horizontal temperature gradient runs from north to south the polar air is on the eastern side and above the core of the jet the polar air is below and to the east of the core of the jet below the core of the jet the horizontal temperature gradient runs from north to south

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89-The relative humidity of a sample air mass is 50%. How is the relative humidity of this air mass influenced by changes of the amount of water vapour in it?

050 1204 Thermodynamics

It increases with increasing water vapour. It is only influenced by temperature. It is not influenced by changing water vapour. It decreases with increasing water vapour.

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90-Which of the following cloud types will most probably form when cold moist air moves over a warm surface?

050 16710 Air Masses and Fronts

Nimbostratus. Stratus. Stratocumulus. Cumulus.

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91-In wintertime stratus is often formed when warm maritime air moves over cold land. How can such clouds be classified?

050 16550 Clouds and Fog

Convective clouds. Turbulence clouds. Orographic clouds. Frontal clouds.

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92-A strong, dry and warm downslope wind, produced by prior enforced ascent of air over hills or mountains is known as a

050 4081 Climatology

Scirocco Mistral Bora Foehn

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93-Considering the North Atlantic region between 30°N and 65°N, the mean position of the polar front during summer extends from

050 10876 Meteorological Information

Greenland to Spain NE Canada to Iceland Florida to SW England Newfoundland to N Scotland

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94-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 ?

050 1566 Wind

It decreases and then increases. It stays the same. It increases. It decreases.

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95-Which of the following statements is true of the dew point of an air mass?

050 10968 Air Masses and Fronts

It can be used together with the air pressure to estimate the air mass's relative humidity It can be higher than the temperature of the air mass It can be used to estimate the air mass's relative humidity even if the air temperature is unknown It can only be equal to, or lower, than the temperature of the air mass

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96-Which type of air mass never occurs over central Europe ?

050 12863 Air Masses and Fronts

Equatorial air Tropical air Polar air Arctic air

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97-The air mass type indicated by arrow number 4 is designated

050 13593 Air Masses and Fronts

Maritime polar. Maritime tropical. Continental tropical. Continental polar.

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98-Which of the following situations will most likely lead to a stable air mass?

050 15777 Thermodynamics

Widespread convection. Cold air at higher levels and advection of warm air at lower levels. Decreasing wind and developing showers. Subsidence and/or cooling from below.

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99-A given mass of air is saturated with water vapour (no condensed water). If temperature increases

050 16759 Thermodynamics

the amount of water vapour decreases the amount of water vapour remains constant relative humidity remains constant relative humidity increases

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100-If a saturated air mass descends down a slope its temperature increases at

050 2130 Thermodynamics

the same rate as if the air mass were dry. a higher rate than in dry air, as it gives up latent evaporation heat. a lower rate than in dry air, as evaporation absorbs heat. a lower rate than in dry air, as condensation gives out heat.

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1-The air mass in the warm sector of a polar front is:

2-What cloud cover is typical for a wide warm sector of a polar front depression over Central Europe in the summer ?

3-How do air masses move at a warm front ?

4-Cold front undercuts the warm air because of;

5-An aircraft is approaching a cold front from the warm air mass side at FL 270 and experiencing moderate to severe turbulence. A jet stream is forecast to be at FL 310. The shortest way to get out of this turbulence is by:

6-The polar front is

7-The warm sector is indicated by:

8-What is the surface visibility most likely to be in a warm sector of maritime tropical air during a summer afternoon in western Europe?

9-Where is the projection of the polar front jet stream on the surface most likely to be found in relation to the cold and warm fronts of a depression?

10-In a warm front occlusion

11-If you have to fly through a warm front when freezing level is at 10000 feet in the warm air and at 2000 feet in the cold air, at which altitude is the probability of freezing rain the lowest ?

12-In case of fronts, what cloud formation is most likely to occur at low levels when a warm air mass overrides a cold air mass?

13-The polar front is the boundary between:

14-The approximate inclined plane of a warm front is:

15-Thunderstorms can occur on a warm front if the

16-On an aerodrome, when a warm front is approaching

17-What type of weather can usually be expected in a polar maritime air mass over central Europe in the daytime during summer?

18-What type of weather can usually be expected in a polar maritime air mass over Central Europe in the daytime during summer?

19-An air mass is:

20-An occlusion has the characteristics of a warm front when:

21-At a station at the surface the significant weather with a warm front will come:

22-Thunderstorms in exceptional circumstances can occur in a warm front if

23-The slope and speed of a warm front compared to the slope and speed of a cold front is in general:

24-Which of the following statements is correct concerning the weather in a warm sector?

25-What is necessary for the development of a polar front jet stream?

26-The core of the polar front jet stream is usually located in the

27-The average position of the polar front in the northern hemisphere is:

28-The average position of the polar front in the northern hemisphere is:

29-Where would you expect polar front depressions?

30-In the northern hemisphere advection of warm air aloft indicates:

31-An occlusion is called a warm occlusion when the cold air

32-When in the upper part of a layer warm air is advected the

33-When warm air moves over a colder surface, __________.

34-An air mass is stable when

35-An air mass is unstable when

36-Where does polar continental air originate?

38-For an airfield located in the British Isles, the passage of a warm front will usually be indicated by

39-Which type of precipitation is the most dangerous at the time of warm front?

40-Where, as a general rule, is the core of the polar front jet stream to be found?

41-In which zone of a polar front jet stream is the strongest CAT to be expected ?

42-Where is the wind speed of a polar front jet stream normally at its strongest?

43-What is the main cause for the formation of a polar front jet stream?

44-What is the average height of the jet core within a polar front jet stream?

45-In which main direction does a polar front depression move?

46-Where, as a general rule, is the core of the polar front jet stream to be found?

47-In which zone of a polar front jet stream is the strongest CAT to be expected ?

48-Which of the following statements concerning the core of a polar front jet stream is correct ?

49-Which statement concerning the cold front and warm front of a frontal depression in the northern hemisphere is correct?

50-Over Central Europe what type of cloud cover is typical of the warm sector of a depression during winter?

51-Your planned route lies within a warm sector of a depression which would suggest:

52-Advection of very cold air over a warm sea current can cause:

53-When warm moist air moves over a colder surface, __________.

54-An unstable air mass will normally be characterised by

55-An air mass is called stable when

56-In which of the following regions does maritime polar air originate?

57-Which of the following statements is correct concerning the typical weather in a warm sector in mid- and high latitudes over continental areas during summer?

58-The passage of a warm front can be associated with areas of fog. The types of fog just in advance and just after the passage are respectively

59-What types of cloud will you see flying at FL 50 towards a warm front?

60-Which of the following conditions are you most likely to encounter when approaching an active warm front at medium to low level ?

61-Ahead of a warm front (northern hemisphere) the wind direction changes from the surface up to the tropopause. The effect of this change is that the wind

62-The main factor which contributes to the formation of very low clouds ahead of a warm front is the

63-Seen from the surface, the passage of a warm front is characterized by which of the following cloud types?

64-Which of the following combinations is most characteristic of unstable air behind a cold front?

65-What is the relative movement of the two air masses along a cold front ?

66-Where is the coldest air to be found, in an occlusion with cold front characteristics?

67-Where is the cold air in an occlusion that has the characteristics of a cold front?

68-Which of the following processes will increase the stability of an air mass?

69-The air mass affecting position "R" is most likely to be

70-The air mass affecting position "A" is most likely to be

71-The air mass affecting position "P" is most likely to be

72-The air mass affecting position "C" is most likely to be

73-The air mass affecting position "S" is most likely to be

74-The air mass at position "X" is most likely to be

75-Which of the following processes will increase the stability of an air mass?

76-An air mass acquires its basic properties

77-In which air mass are extremely low temperatures encountered?

78-In which air mass are extremely low temperatures encountered?

79-The actual change of the temperature in the air mass with height is known as: