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Question 151-1 : About ten identical clouds are in the sky well isolated from one another dense with well defined contours developping vertically in a cauliflower shape the side of these clouds lit by the sun is bright white their base relatively dark is essentially horizontal and at fl 30 and their tops at fl 150 . ? [ Learning aircraft ]

Towering cumulus

exemple 251 Towering cumulus.

Question 151-2 : Which of the following cloud types is classified as low level cloud ?

Sc

Cqb15 july 2011 .sc stratocumulus low level .cs cirrostratus high level .as altostratus medium level .ac altocumulus medium level exemple 255 Sc.

Question 151-3 : Which of the following cloud types is found at high level ?

Cs

Cqb15 july 2011 .cs cirrostratus high level .sc stratocumulus low level .st stratus low level .ac altocumulus medium level . 503. exemple 259 Cs.

Question 151-4 : Which one of the displayed cloud forms is representative of a cumulus . 375 ?

1

Cqb15 august 2011 exemple 263 1.

Question 151-5 : Which one of the following cloud types can be characterised by the optical phenomenon called halo ?

Cirrostratus

Admin . 635.they are produced by the ice crystals in cirrus clouds high the particular shape and orientation of the crystals is responsible for the type of halo observed light is reflected and refracted by the ice crystals and may split up into colors because of dispersion the crystals behave like prisms and mirrors refracting and reflecting sunlight between their faces sending shafts of light in particular directions exemple 267 Cirrostratus.

Question 151-6 : Which cloud type genus is described by the following definition . ?

Altostratus

Admin . cirrus ci detached clouds in the form of white dedicate filaments or white or mostly white patches or narrow bands these clouds have fibrous hair like appearance or a silky sheen or both . cirrocumulus cc thin white patch sheet or layer of cloud without shading composed of very small elements in the form of grains ripples etc merged or separate and more or less regularly arranged most of the elements have an apparent width of less than one degree . cirrostratus cs transparent whitish cloud veil of fibrous hair like or smooth appearance totally or partly covering the sky and generally producing halo phenomena . altostratus as greyish or bluish cloud sheet or layer of striated fibrous or uniform appearance totally or partly covering the sky and having parts thin enough to reveal the sun at least vaguely as through ground glass altostratus cloud does not show halo phenomena . altocumulus ac white or grey or both white and grey patch sheet or layer of cloud generally with shading composed of laminae rounded masses rolls etc which are sometimes partly fibrous or diffuse and which may or may not be merged most of the regularly arranged small elements usually have an apparent width of between one and five degrees . nimbostratus ns grey cloud layer often dark the appearance of which is rendered diffuse by more or less continuously falling rain or snow which in most cases reaches the ground it is thick enough throughout to blot out the sun . stratocumulus sc grey or whitish or both grey and whitish patch sheet or layer of cloud which almost always has dark parts composed of tessellations rounded masses rolls etc which are non fibrous except for virga and which may or may not be merged most of the regularly arranged small elements have an apparent width of more than five degrees . stratus st generally grey cloud layer with a fairly uniform base which may give drizzle ice prisms or snow grains when the sun is visible through the cloud its outline is clearly discernible stratus does not produce halo phenomena except possible at very low temperatures . cumulus cu detached clouds generally dense and with sharp outlines developing vertically in the form of rising mounds domes or towers of which the bulging upper parts often resembles a cauliflower the sunlit parts of these clouds are mostly brilliant white their base is relatively dark and nearly horizontal . cumulonimbus cb heavy and dense cloud with a considerable vertical extent in the form of a mountain or huge towers at least part of its upper portion is usually smooth or fibrous or striated and nearly always flattened this part often spreads out in the shape of an anvil or vast plume under the base of this cloud which is often very dark there are frequently low ragged clouds ether merged with it or not and precipitation sometimes in the form of virga .alto means height or upper air in meteorological context = medium level .cirro from which cirrus is obtained means 'wisp of hair' .cumulo from which cumulus is obtained means 'heap' clouds with this designator appear to be piled up these type clouds form in unstable layers of air the initial lifting may be due to convective lifting or forced mechanical lifting such as orographic frontal or convergence lifting if the layer is unstable the air parcel will continue to rise producing a cumulo form cloud .nimbo means 'rain' thus nimbostratus and cumulonimbus are clouds from which precipitation occurs .strato from which stratus is obtained means 'layer' or 'layered' clouds with this designator form in stable layers of air except the stratocumulus type which forms in a thin unstable layer of air exemple 271 Altostratus.

Question 151-7 : What cloud type can produce freezing rain ?

Nimbostratus

Img505 exemple 275 Nimbostratus.

Question 151-8 : Frontal fog is most likely to dissipate ?

After the passage of a warm front

Admin .the question asks for 'dissipation' of the frontal fog not how it occurs .frontal fog is likely to occur in advance of a warm front due to rain falls from warm air to cold air .frontal fog is most likely to dissipate after the passage of a warm front exemple 279 After the passage of a warm front.

Question 151-9 : Which of the following situations will most likely lead to a stable air mass ?

Subsidence and/or cooling from below

exemple 283 Subsidence and/or cooling from below.

Question 151-10 : 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 ?

Castellanus

exemple 287 Castellanus.

Question 151-11 : Which of the following processes contributes to the formation of frontal fog ?

Rain falls from the warm air into the cold air

exemple 291 Rain falls from the warm air into the cold air.

Question 151-12 : Which cloud species is described by the following definition . ?

Capillatus

As the cumulonimbus cloud grows in size it may turn into a cumulonimbus capillatus which means that it gains a fibrous edged top . 640.a clearly developed cumulonimbus capillatus displaying the classic anvil shape exemple 295 Capillatus.

Question 151-13 : Which of the following statements is true concerning orographic fog ?

It may be formed by day as well as by night

The most likely conditions which contribute to the formation of orographic fog hill fog are humid stable air mass and wind blowing towards the hills orographic fog may be formed by day as well as by night exemple 299 It may be formed by day as well as by night.

Question 151-14 : Which cloud type genus is described by the following definition .'detached clouds in the form of white delicate filaments or white or mostly white patches or narrow bands these clouds have fibrous hair like appearance or a silky sheen or both' ?

Cirrus

Admin . 642. cirrus cloud exemple 303 Cirrus.

Question 151-15 : The main components of a cirrostratus are ?

Ice crystals

exemple 307 Ice crystals.

Question 151-16 : Which of the following circumstances most favours the development of orographic fog ?

High relative humidity

Ecqb01 2013..the most likely conditions which contribute to the formation of orographic fog hill fog are humid stable air mass and wind blowing towards the hills orographic fog may be formed by day as well as by night exemple 311 High relative humidity.

Question 151-17 : The main components of an altostratus are ?

Ice crystals and water droplets

Ecqb01 2013 exemple 315 Ice crystals and water droplets.

Question 151-18 : Which of the following cloud types is found at high level ?

Cc

Ecqb01 2013..cc cirrocumulus high level .sc stratocumulus low level .st stratus low level .ac altocumulus medium level . 503. exemple 319 Cc

Question 151-19 : In wintertime stratus is often formed when warm maritime air moves over cold land how can such clouds be classified ?

Turbulence clouds

Kschepers .why thanks in advance for your answer ..these clouds are classified as 'turbulence cloud' because they are formed by the action of atmospheric turbulence they are not formed by orographic frontal or convective lifting these clouds are usually formed in a distinctive layer above the condensation level which is about 1000 ft thick in otherwise stable atmosphere exemple 323 Turbulence clouds.

Question 151-20 : Which cloud type 'genus' is described by the following definition . ?

Nimbostratus

Ecqb01 june 2013 exemple 327 Nimbostratus.

Question 151-21 : Which cloud type 'genus' is described by the following definition .'cumulus clouds which are markedly sprouting and are often of great vertical extent their bulging upper part frequently resembles a cauliflower' ?

Towering cumulus

Ecqb01 june 2013 exemple 331 Towering cumulus.

Question 151-22 : Which of the following statements is true concerning frontal fog ?

It may be formed by day as well as by night

Ecqb01 june 2013 exemple 335 It may be formed by day as well as by night.

Question 151-23 : Which of the following statements is true concerning orographic fog ?

It is formed when air is forced to rise up a slope

Easa 2014 ..the most likely conditions which contribute to the formation of orographic fog hill fog are humid stable air mass and wind blowing towards the hills orographic fog may be formed by day as well as by night exemple 339 It is formed when air is forced to rise up a slope.

Question 151-24 : Which of the following cloud types will most probably form when cold moist air moves over a warm surface ?

Cumulus

Easa 2014 ..over a warm surface a cold air will be heated by convection lower layer will rise and increase instability this will lead to the formation of cumulus and possible cumulonimbus with sometime severe thunderstorms exemple 343 Cumulus.

Question 151-25 : Which of the following clouds may extend into more than one étage ?

Cumulus congestus

Admin .as strange as the easa can be french word 'étage' with its acute accent has been used at the exam instead of 'level' referring to low medium and high level clouds classification exemple 347 Cumulus congestus.

Question 151-26 : Which of the following circumstances most favours the development of frontal fog ?

Increase of the relative humidity by evaporation of rain drops

Revised ecqb03 august 2016 ..frontal fog is most likely to occur in advance of a warm front it is due to the rain falls from the warm air into the cold air .frontal fog can be formed by condensation of air saturated by evaporation of precipitation .steaming fog is the same as arctic smoke or sea smoke and is caused by cold air moving over a warm surface .advection fog forms when warm humid air flows over a cold surface .radiation fog forms due to surface cooling at night in a light wind exemple 351 Increase of the relative humidity by evaporation of rain drops.

Question 151-27 : Where does one normally find the highest cloud tops ?

In a tropical cyclone

Ecqb03 august 2016 exemple 355 In a tropical cyclone.

Question 151-28 : The frontal or mixing fog results from the meeting of ?

A warm and very humid air mass with a cold and very humid air mass

exemple 359 A warm and very humid air mass with a cold and very humid air mass.

Question 151-29 : What wind conditions occurring just before dawn favour the formation of fog at an airport where the temperature is 15°c and the dew point is 14°c ?

Calm

exemple 363 Calm.

Question 151-30 : If you are flying from zurich to stockholm at fl 240 what conditions can you expect at cruising altitude . 400 ?

Out of cloud throughout the flight

Admin .the questions states at cruising altitude fl240 only at this level you are out of cat area out of clud top of clouds is at fl150 and there is no scattered thunderstorms exemple 367 Out of cloud throughout the flight.

Question 151-31 : In which cloud type does moderate to severe airframe icing most probably occur ?

In nimbostratus clouds

Admin .airframe icing will not happen in cirrus cloud composed of ice crystals or if the temperature is above 0ºc ns nimbostratus produces heavy rain if the rain falls through a cold air mass below the freezing level moderate to severe airframe icing can occur .in clear air you can only have light icing exemple 371 In nimbostratus clouds.

Question 151-32 : Which of the following clouds represents the most stable air mass ?

Altocumulus lenticularis

exemple 375 Altocumulus lenticularis.

Question 151-33 : A frontal depression passes through the airport what form of precipitation do you expect ?

Continuous rain or snow during 6 hours until the warm front arrives the precipitation stops for several hours within the warm sector on the arrival of the cold front showers within a couple of hours

exemple 379 Continuous rain or snow during 6 hours until the warm front arrives. the precipitation stops for several hours within the warm sector. on the arrival of the cold front, showers within a couple of hours.

Question 151-34 : Which of the following are favourable conditions for the formation of freezing rain ?

Warm air aloft from which rain is falling into air with a temperature below 0°c

Admin .freezing rain is associated with warm fronts and warm occlusions in a warm front the freezing level is lower than behind in the warm sector and the slope means that freezing rain will be falling on anything underneath so if you are flying towards a warm front or warm occlusion watch out supercooled water droplets from above will freeze onto your cold airframe once you see ice pellets expect freezing rain next . 505 exemple 383 Warm air aloft from which rain is falling into air with a temperature below 0°c.

Question 151-35 : Which form of precipitation from clouds containing only water is most likely to fall in mid latitudes ?

Drizzle

Admin .large waterdropplets will only form in clouds with large vertical extent and most likely also contain ice .since this cloud only contains water it is probably a normal stratus cloud the most likely answere therefore must be drizzle .answers rain with large drops refer to cumulonimbus cloud at mid latitudes in summer a cumulonimbus cloud contains ice crystals water droplets and supercooled water droplets exemple 387 Drizzle.

Question 151-36 : Which of the following zones is most likely to encounter little or no precipitation ?

The north side of the alps with a prevailing foehn from the south

Admin .foehn winds produce precipitation on the windward side but are dry and warm on the lee ward side the lee ward side is most likely zone to encounter little or no precipitation . 502.fronts and occlusions produce plenty of precipitation exemple 391 The north side of the alps with a prevailing foehn from the south.

Question 151-37 : What is encountered during the summer over land in the centre of a cold air pool ?

Showers and thunderstorms

Admin .a cold pool is a meteorologic term for a cold air block it is an area with light or no wind low temperature it is a place of instability and convective activity exemple 395 Showers and thunderstorms.

Question 151-38 : What type of cloud can produce hail showers ?

Cb

exemple 399 Cb.

Question 151-39 : Which airport at 1200 utc has the lowest probability of precipitation . 268 ?

Lszh

exemple 403 Lszh

Question 151-40 : Flight lisbon to bordeaux eta 1800 utc what type of precipitation is forecast on the approach to bordeaux .taf lfbd 281400z 281524 26015kt 9999 shra bkn020 tempo 1620 26020g30kt 8000 +shra bkn015cb prob30 tsra = ?

Heavy rain showers

exemple 407 Heavy rain showers.


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