Index - Atpl Campus

100 item has been found

1-In the lower levels of the atmosphere when the environmental lapse rate is greater than saturated adiabatic lapse rate but less than dry adiabatic lapse rate - the air mass is described as being

050 10899 Thermodynamics

absolutely unstable unstable conditionally unstable stable

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2-Consider a parcel of air being forced upwards in the atmosphere. The lapse rate of the surrounding air is less than the saturated adiabatic lapse rate. After the initial force is no longer effective, the parcel of air

050 15075 Thermodynamics

will tend to remain at the new altitude. will tend to descend to its original altitude. will become conditionally unstable. will tend to ascend further.

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3-The value of the saturated adiabatic lapse rate is closest to that of the dry adiabatic lapse rate in

050 4997 The Atmosphere

cirrus freezing fog cumulus stratus

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4-The dry adiabatic lapse rate

050 3729 The Atmosphere

has a variable value is greater during the night than during the day is greater in summer than in winter has a constant fixed value

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5-Absolute instability in the atmosphere will occur when the environmental lapse rate is

050 10852 Thermodynamics

less than both saturated adiabatic lapse rate and dry adiabatic lapse rate greater than both saturated adiabatic lapse rate and dry adiabatic lapse rate greater than saturated adiabatic lapse rate but less than dry adiabatic lapse rate less than saturated adiabatic lapse rate

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6-The environmental lapse rate in an actual atmosphere

050 3727 The Atmosphere

has a fixed value of 1°C/100m varies with time has a fixed value of 2°C/1000 FT has a fixed value of 0.65°C/100m

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7-What is the dry adiabatic lapse rate ?

050 12860 Thermodynamics

1.5°C/1000 FT 3.0°C/1000 FT 3.5°C/1000 FT 2.0°C/1000 FT

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8-What is the dry adiabatic lapse rate ?

050 61 Thermodynamics

3.0°C/1000 FT 3.5°C/1000 FT 1.5°C/1000 FT 2.0°C/1000 FT

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9-The rate of cooling of ascending saturated air is less than the rate of cooling of ascending unsaturated air because:

050 4140 Thermodynamics

water vapour doesn't cool as rapidly as dry air water vapour absorbs the incoming heat from the sun heat is released during the condensation process moist air is heavier than dry air

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10-The dry adiabatic lapse rate has a value of

050 3728 The Atmosphere

2°C/1000FT 0.65°C/100m 0.5°C/100m 1°C/100m

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11-The dry adiabatic lapse rate has a value of

050 1

2°C/1000ft 0.5°C/100m 0.65°C/100m 3°C/1000ft

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12-What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge?

050 1

Cloud reaches to the top Cloud bases form Precipitation starts Stable air changes to unstable air

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13-The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately

050 4133 Thermodynamics

1.5°C 0.6°C 0.35°C 1°C

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14-The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately

050 1

0.6°C 1.5°C 0.35°C 1°C

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15-The temperature lapse rate of the ICAO standard atmosphere in the troposphere is:

050 13607 The Atmosphere

3°C/1000 FT 2°C/1000 FT 2,5°C/1000 FT 6,5°C/1000 FT

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16-The International Standard Atmosphere assumes a lapse rate of:

050 1

3°C/1000ft. 1.98°C/1000ft. 1.5°C/1000ft. 4°C/1000 ft.

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17-Absolute instability is said to exist whenever the environmental lapse rate

050 13656 Wind Uncategorized

is between the dry and saturated adiabatic lapse rate exceeds the dry adiabatic lapse rate is less than the dry adiabatic lapse rate is less than the saturated adiabatic lapse rate

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18-Absolute instability is said to exist whenever the environmental lapse rate

050 1199 Wind Uncategorized

is between the dry and saturated adiabatic lapse rate is less than the saturated adiabatic lapse rate exceeds the dry adiabatic lapse rate is less than the dry adiabatic lapse rate

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19-In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being

050 4022 Thermodynamics

absolutely stable conditionally stable absolutely unstable conditionally unstable

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20-In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being

050 1

conditionally unstable conditionally stable absolutely stable absolutely unstable

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21-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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22-Good visibility in the lower levels may be expected when

050 13651 Air Masses and Fronts

the air temperature is low. the atmospheric pressure is low. cool dry air is moving over a warmer surface. warm air is moving over a cold surface.

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23-If you are flying at FL 100 in an air mass that is 10°C warmer than a standard atmosphere, what is the outside temperature likely to be?

050 2252 The Atmosphere

+15°C -10°C -15°C +5°C

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24-If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

050 2251 The Atmosphere

-15°C -30°C -45°C -60°C

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25-The QNH at an airfield located 200 metres above sea level is 1009 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QFF?

050 2242 The Atmosphere

1009 hPa Less than 1009 hPa It is not possible to give a definitive answer More than 1009 hPa

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26-The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?

050 2241 The Atmosphere

More than 1016 hPa 1016 hPa It is not possible to give a definitive answer Less than 1016 hPa

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27-For both saturated and unsaturated air instability will occur when the

050 10884 Thermodynamics

dry adiabatic lapse rate is less than saturated adiabatic lapse rate but greater than environmental lapse rate environmental lapse rate is greater than both dry adiabatic lapse rate and saturated adiabatic lapse rate environmental lapse rate is greater than saturated adiabatic lapse rate but less than dry adiabatic lapse rate environmental lapse rate is less than both dry adiabatic lapse rate and saturated adiabatic lapse rate

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28-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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29-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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30-The QFF at an airfield in California located 69 metres below sea level is 1030 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?

050 2246 The Atmosphere

1030 hPa It is not possible to give a definitive answer Less than 1030 hPa More than 1030 hPa

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31-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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32-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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33-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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34-When visibility is reduced by water droplets to less than 1000 metres it is classified as

050 10957 Clouds and Fog

mist dust fog fog haze

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35-Divergence in the upper air that is greater than the convergence in the friction layer results, near the surface, in

050 4072 Wind

falling pressure and likely dissipation of clouds falling pressure and likely formation of clouds rising pressure and likely formation of clouds rising pressure and likely dissipation of clouds

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36-When the temperature and dew point are less than one degree apart the weather conditions are most likely to be

050 4086 Clouds and Fog

unlimited visibility high scattered clouds fog or low cloud clear and cool

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37-When a mass of unsaturated air descends, what effect will it have on relative humidity?

050 1208 Thermodynamics

It remains constant. It decreases. It increases up to 100%, then remains stable. It increases.

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38-An unstable air mass when forced to rise due to orographic lifting will produce:

050 1

Lenticular cloud. None, as the air will subside and warm adiabatically after the summit is passed. Cloud of extensive vertical development. Thick stratiform cloud, probably nimbostratus.

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39-If an Environment Lapse Rate (ELR) has steep value...

050 1

stable conditions exist. conditionally stable conditions exist. neutral conditions exist. unstable conditions exist.

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40-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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41-The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QNH?

050 2511 The Atmosphere

It is not possible to give a definitive answer Less than 1016 hPa More than 1016 hPa 1016 hPa

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42-A sample of moist but unsaturated air may become saturated by

050 4034 Thermodynamics

lowering the pressure, keeping temperature constant expanding it adiabatically compressing it adiabatically raising the temperature

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43-A moist but unsaturated parcel of air becomes saturated by

050 4033 Thermodynamics

lowering the parcel to a lower level moving the parcel to an area with higher pressure and equal temperature moving the parcel to an area with lower pressure and equal temperature lifting the parcel to a higher level

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44-A parcel of air is said to be saturated if it has a relative humidity of:

050 1

50% Greater than 80 % Greater than 90 % 100%

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45-You intend to overfly a mountain range. The recommended minimum flight altitude is, according to the aviation chart, 15000 FT/AMSL. The air mass that you will fly through is on average 15°C warmer than the standard atmosphere. The altimeter is set to QNH (1023 hPa). At what altimeter reading will you effectively be at the recommended minimum flight altitude?

050 1556 The Atmosphere

15900 FT. 13830 FT. 14100 FT. 14370 FT.

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46-The reason for the cooling of the parcel of air during the adiabatic process is…

050 1

pressure decrease. getting away from the earth. temperature decrease. pressure increase.

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47-The QNH at an airfield in California located 69 metres below sea level is 1018 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QFF?

050 2245 The Atmosphere

It is not possible to give a definitive answer Less than 1018 hPa More than 1018 hPa 1018 hPa

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48-Half the mass of the atmosphere is found in the first

050 2126 The Atmosphere

5 km 11 km 3 km 8 km

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49-The temperature remains constant through a given depth of atmosphere, it is described as

050 1

advection the Environmental Lapse Rate being isothermal, temperature inversion

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50-You are planning to fly across a mountain range. The chart recommends a minimum altitude of 12000 feet above mean sea level. The air mass you will be flying through is an average 10°C warmer than ISA. Your altimeter is set to 1023 hPa (QNH of a nearby airport at nearly sea level). What altitude will the altimeter show when you have reached the recommended minimum altitude?

050 2522 The Atmosphere

12210 feet 11520 feet 11790 feet 11250 feet

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51-What type of cloud is being described ? A generally grey cloud layer with fairly uniform base and uniform appearance, which may give drizzle or snow grains. When the sun is visible through the cloud, the outline is clearly discernible. Sometimes it appears in the form of ragged patches.

050 4052 Clouds and Fog

Cirrostratus Altostratus Stratus Nimbostratus

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52-Which of the processes listed below can cause air to become saturated?

050 1

Heating Evaporation. Melting Condensation.

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53-With all other quantities being constant, the density of the atmosphere increases with increasing

050 12797 The Atmosphere

air pressure temperature stability relative humidity

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54-What causes the highest percentage of the atmosphere lies under the 50% of lower Troposphere?

050 1

Radiated energy from the Sun. Low level winds. Gravity. Corriollis force.

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55-What is the approximate composition of the dry air by volume in the troposphere ?

050 1103 The Atmosphere

10 % oxygen, 89 % nitrogen, and the rest other gasses 21 % oxygen, 78 % nitrogen, and the rest other gasses 50 % oxygen, 40 % nitrogen, and the rest other gasses 88 % oxygen, 9 % nitrogen, and the rest other gasses

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56-The ICAO Standard Atmosphere (ISA) assumes that temperature will reduce at the rate of

050 10921 The Atmosphere

2°C per 1000 FT up to 36090 FT and will then increase at 0,3°C per 1000 FT up to 65617 FT 1,98°C per 1000 FT up to 36090 FT and will then rise at 0,3°C per 1000 FT up to 65617 FT when it will remain constant 1,98°C per 1000 FT up to 36090 FT after which it remains constant to 65617 FT 2°C per 1000 FT up to 65617 FT after which it will remain constant to 104987 FT

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57-The ICAO Standard Atmosphere (ISA) assumes that temperature will reduce at the rate of

050 13730 The Atmosphere

2°C per 1000 FT up to 36090 FT and will then increase at 0,3°C per 1000 FT up to 65617 FT 1,98°C per 1000 FT up to 36090 FT after which it remains constant to 65617 FT 2°C per 1000 FT up to 65617 FT after which it will remain constant to 104987 FT 1,98°C per 1000 FT up to 36090 FT and will then rise at 0,3°C per 1000 FT up to 65617 FT when it will remain constant

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58-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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59-When water evaporates into unsaturated air

050 4032 Thermodynamics

heat is released relative humidity is decreased heat is absorbed relative humidity is not changed

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60-Decode the cloud bases being described in this METAR for an aerodrome: 261450Z 07007KT 9999 FEW035 SCT043 BKN240 21/12 Q1016 NOSIG =

050 1

1-2 oktas at 3500 ft., 2-3 oktas at 4300 ft., 5-8 oktas at 24000 ft. 1-2 oktas at 3500 ft., 3-4 oktas at 4300 ft., 5-7 oktas at 24000 ft. 2-3 oktas at 3500 ft., 4-5 oktas at 4300 ft., 6-7 oktas at 24000 ft. 1-2 oktas at 350 ft., 3-4 oktas at 430 ft., 5-7 oktas at 2400 ft.

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61-The temperature at FL 140 is -12°C. What will the temperature be at FL 110 if the ICAO standard lapse rate is applied ?

050 65 The Atmosphere

-9°C. -15°C. -18°C. -6°C.

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62-The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied ?

050 2498 The Atmosphere

+2°C -6°C 0°C -4°C

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63-The temperature at FL 160 is -22°C. What will the temperature be at FL 90 if the ICAO standard lapse rate is applied ?

050 2500 The Atmosphere

0°C +4°C -4°C -8°C

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64-The temperature at FL 110 is -5°C. What will the temperature be at FL 50 if the ICAO standard lapse rate is applied ?

050 2499 The Atmosphere

+3°C 0°C -3°C +7°C

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65-Air masses which are being cooled from below are often characterized by:

050 10856 Air Masses and Fronts

fog, poor visibility and layered clouds. uniform temperature, good visibility. continuous rain and freezing temperatures. strong winds, cumulus clouds, good visibility.

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66-Air masses which are being cooled from below are often characterized by:

050 13659 Air Masses and Fronts

uniform temperature, good visibility. continuous rain and freezing temperatures. strong winds, cumulus clouds, good visibility. fog, poor visibility and layered clouds.

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67-By volume, what percentage of the air in the lower troposphere consists of water vapour?

050 15462 The Atmosphere

5-10 % 20-30 % 0-5 % 10-15 %

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68-"An aircraft flying at low level in the vicinity of a range of hills across which a strong wind is blowing may experience: 1- Severe turbulence below any rotor zone. 2- Downdraughts which may completely overcome the rate of climb of some low powered light aircraft. 3- A greater than normal risk of icing in cloud over the crest of the hills."

050 1

only 1 and 3 are correct. 1, 2 and 3 are correct. only 1 and 2 are correct. only 2 and 3 are correct.

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69-Which cloud species is described by the following definition?
"Cumulonimbus characterised by the presence, mostly in its upper portion, of distinct cirriform parts of clearly fibrous or striated structure, frequently having the form of an anvil, a plume or a vast, more or less disorderly mass of hair. This specie is usually accompanied by a shower, or by a thunderstorm, often with squalls and sometimes with hail; it frequently produces very well defined virga."

050 15743 Clouds and Fog

Capillatus Fractus Congestus Calvus

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70-In the lower layers of the atmosphere due to friction the wind changes direction towards the low pressure area because:

050 1099 Wind

turbulence is formed and pressure increases the pressure gradient increases turbulence is formed and pressure decreases wind speed decreases and therefore coriolis force decreases

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71-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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72-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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73-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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74-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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75-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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76-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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77-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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78-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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79-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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80-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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81-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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82-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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83-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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84-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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85-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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86-When ...... in a parcel of air, relative humidity increases.

050 1

temperature increases density increases water vapor added reduced humidity

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87-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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88-When Air density will be lowest at the Earth's surface:

050 1

pressure is low and temperature is low pressure is high and temperature is low pressure is low and temperature is high pressure is high and temperature is high

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89-When cold air moves over a warmer surface, __________.

050 1

it becomes stable. it produces frontal fog. it becomes unstable. it sinks.

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90-Which cloud species is described by the following definition?
"Clouds which present, in at least some portion of their upper part, cumuliform protuberances in the form of turrets which generally give the clouds a crenellated appearance. The turrets, some of which are taller than they are wide, are connected by a common base and seem to be arranged in lines. The typical character is especially evident when the clouds are seen from the side."

050 15494 Clouds and Fog

Congestus Calvus Castellanus Fractus

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91-At the same latitude the geostrophic wind is greater than the gradient wind around a low pressure system with equal pressure gradient because the

050 1090 Wind

centrifugal force opposes the pressure gradient centrifugal force is added to the pressure gradient coriolis force opposes to the centrifugal force coriolis force is added to the pressure gradient

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92-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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93-The pressure system indicated in a vertical cross section by pressure surfaces at lower heights bulging upward and pressure surfaces at greater heights bulging downward, is a

050 10926 Pressure Systems

warm high pressure area warm low pressure area cold low pressure area cold high pressure area

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94-At the same latitude the geostrophic wind is less than the gradient wind around an anticyclone with equal pressure gradient because the

050 1091 Wind

centrifugal force opposes the pressure gradient effect of coriolis is added to friction coriolis effect opposes the centrifugal force centrifugal force is added to the pressure gradient

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95-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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96-Which of the following conditions would cause the altimeter to indicate a lower altitude than that actually flown ?

050 2169 The Atmosphere

Pressure altitude the same as indicated altitude. Atmospheric pressure lower than standard Air temperature lower than standard. Air temperature higher than standard

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97-Which layer of the atmosphere contains more than 90 per cent of all water vapour?

050 2497 The Atmosphere

Lower stratosphere Ozone layer Upper stratosphere Troposphere

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98-Adiabatic process is;

050 1

decrease in temperature in a parcel of air. increase in temperature in a parcel of air. formation of cloud in a parcel of air. change in temperature because of pressure change.

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99-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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100-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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1-In the lower levels of the atmosphere when the environmental lapse rate is greater than saturated adiabatic lapse rate but less than dry adiabatic lapse rate - the air mass is described as being

2-Consider a parcel of air being forced upwards in the atmosphere. The lapse rate of the surrounding air is less than the saturated adiabatic lapse rate. After the initial force is no longer effective, the parcel of air

3-The value of the saturated adiabatic lapse rate is closest to that of the dry adiabatic lapse rate in

4-The dry adiabatic lapse rate

5-Absolute instability in the atmosphere will occur when the environmental lapse rate is

6-The environmental lapse rate in an actual atmosphere

7-What is the dry adiabatic lapse rate ?

8-What is the dry adiabatic lapse rate ?

9-The rate of cooling of ascending saturated air is less than the rate of cooling of ascending unsaturated air because:

10-The dry adiabatic lapse rate has a value of

11-The dry adiabatic lapse rate has a value of

12-What weather condition occurs at the altitude where the dewpoint lapse rate and the dry adiabatic lapse rate converge?

13-The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately

14-The decrease in temperature, per 100 metres, in a saturated rising parcel of air at lower level of the atmosphere is approximately

15-The temperature lapse rate of the ICAO standard atmosphere in the troposphere is:

16-The International Standard Atmosphere assumes a lapse rate of:

17-Absolute instability is said to exist whenever the environmental lapse rate

18-Absolute instability is said to exist whenever the environmental lapse rate

19-In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being

20-In a layer of air the decrease in temperature per 100 metres increase in height is more than 1°C. This layer can be described as being

21-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?

22-Good visibility in the lower levels may be expected when

23-If you are flying at FL 100 in an air mass that is 10°C warmer than a standard atmosphere, what is the outside temperature likely to be?

24-If you are flying at FL 300 in an air mass that is 15°C warmer than a standard atmosphere, what is the outside temperature likely to be?

25-The QNH at an airfield located 200 metres above sea level is 1009 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QFF?

26-The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?

27-For both saturated and unsaturated air instability will occur when the

28-An air mass is stable when

29-An air mass is unstable when

30-The QFF at an airfield in California located 69 metres below sea level is 1030 hPa. The air temperature is 10°C lower than a standard atmosphere. What is the QNH?

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

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

33-An air mass is called stable when

34-When visibility is reduced by water droplets to less than 1000 metres it is classified as

35-Divergence in the upper air that is greater than the convergence in the friction layer results, near the surface, in

36-When the temperature and dew point are less than one degree apart the weather conditions are most likely to be

37-When a mass of unsaturated air descends, what effect will it have on relative humidity?

38-An unstable air mass when forced to rise due to orographic lifting will produce:

39-If an Environment Lapse Rate (ELR) has steep value...

40-An air mass is:

41-The QFF at an airfield located 400 metres above sea level is 1016 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QNH?

42-A sample of moist but unsaturated air may become saturated by

43-A moist but unsaturated parcel of air becomes saturated by

44-A parcel of air is said to be saturated if it has a relative humidity of:

46-The reason for the cooling of the parcel of air during the adiabatic process is…

47-The QNH at an airfield in California located 69 metres below sea level is 1018 hPa. The air temperature is 10°C higher than a standard atmosphere. What is the QFF?

48-Half the mass of the atmosphere is found in the first

49-The temperature remains constant through a given depth of atmosphere, it is described as

51-What type of cloud is being described ? A generally grey cloud layer with fairly uniform base and uniform appearance, which may give drizzle or snow grains. When the sun is visible through the cloud, the outline is clearly discernible. Sometimes it appears in the form of ragged patches.

52-Which of the processes listed below can cause air to become saturated?

53-With all other quantities being constant, the density of the atmosphere increases with increasing

54-What causes the highest percentage of the atmosphere lies under the 50% of lower Troposphere?

55-What is the approximate composition of the dry air by volume in the troposphere ?

56-The ICAO Standard Atmosphere (ISA) assumes that temperature will reduce at the rate of

57-The ICAO Standard Atmosphere (ISA) assumes that temperature will reduce at the rate of

58-An unstable air mass will normally be characterised by

59-When water evaporates into unsaturated air

60-Decode the cloud bases being described in this METAR for an aerodrome: 261450Z 07007KT 9999 FEW035 SCT043 BKN240 21/12 Q1016 NOSIG =

61-The temperature at FL 140 is -12°C. What will the temperature be at FL 110 if the ICAO standard lapse rate is applied ?

62-The temperature at FL 80 is +6°C. What will the temperature be at FL 130 if the ICAO standard lapse rate is applied ?

63-The temperature at FL 160 is -22°C. What will the temperature be at FL 90 if the ICAO standard lapse rate is applied ?

64-The temperature at FL 110 is -5°C. What will the temperature be at FL 50 if the ICAO standard lapse rate is applied ?

65-Air masses which are being cooled from below are often characterized by:

66-Air masses which are being cooled from below are often characterized by:

67-By volume, what percentage of the air in the lower troposphere consists of water vapour?

70-In the lower layers of the atmosphere due to friction the wind changes direction towards the low pressure area because:

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

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

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

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

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

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

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

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

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

80-An air mass acquires its basic properties

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

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