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Question 165-1 : Which cloud type 'genus' is described by the following definition.'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. low, ragged ? [ Formation assignment ]

Nimbostratus.

Ecqb01 june 2013 exemple 265 Nimbostratus.

Question 165-2 : 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 269 Towering cumulus.

Question 165-3 : 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 273 It may be formed by day as well as by night.

Question 165-4 : 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 277 It is formed when air is forced to rise up a slope.

Question 165-5 : 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 281 Cumulus.

Question 165-6 : Which of the following clouds may extend into more than one étage ?

Cumulus congestus.

.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 285 Cumulus congestus.

Question 165-7 : 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 289 Increase of the relative humidity by evaporation of rain drops.

Question 165-8 : Where does one normally find the highest cloud tops ?

In a tropical cyclone.

Ecqb03, august 2016 exemple 293 In a tropical cyclone.

Question 165-9 : 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 297 A warm and very humid air mass with a cold and very humid air mass.

Question 165-10 : 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 301 Calm.

Question 165-11 : 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.

.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 305 Out of cloud throughout the flight.

Question 165-12 : In which cloud type does moderate to severe airframe icing most probably occur ?

In nimbostratus clouds.

.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 309 In nimbostratus clouds.

Question 165-13 : Which of the following clouds represents the most stable air mass ?

Altocumulus lenticularis.

exemple 313 Altocumulus lenticularis.

Question 165-14 : 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 317 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 165-15 : 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.

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

Question 165-16 : Which form of precipitation from clouds containing only water is most likely to fall in mid latitudes ?

Drizzle.

.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 325 Drizzle.

Question 165-17 : 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.

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

Question 165-18 : What is encountered during the summer, over land, in the centre of a cold air pool ?

Showers and thunderstorms.

.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 333 Showers and thunderstorms.

Question 165-19 : What type of cloud can produce hail showers ?

Cb.

exemple 337 Cb.

Question 165-20 : Which airport, at 1200 utc, has the lowest probability of precipitation. 268 ?

Lszh

exemple 341 Lszh

Question 165-21 : 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 345 Heavy rain showers.

Question 165-22 : An airborne weather radar installation makes it possible to detect the location of ?

Zones of precipitation, particularly liquid state precipitation, and also their intensity

exemple 349 Zones of precipitation, particularly liquid-state precipitation, and also their intensity

Question 165-23 : At which altitude, at temperate latitudes, may hail be expected in connection with a cb ?

From the ground up to a maximum of fl 450.

exemple 353 From the ground up to a maximum of fl 450.

Question 165-24 : With which of the following types of cloud is '+ra' precipitation most commonly associated ?

Ns.

exemple 357 Ns.

Question 165-25 : With what type of cloud is 'gr' precipitation most commonly associated ?

Cb.

exemple 361 Cb.

Question 165-26 : With what type of cloud is 'dz' precipitation most commonly associated ?

St.

.drizzle is a slowly falling precipitation in the form of tiny water droplets with diameters less than 0.5 millimeters. it falls from stratus clouds and is often associated with low visibility and fog. stratus does not usually produce precipitation, but when it does occur it is in the form of minute particles, such as drizzle, ice crystals, or snow grains. exemple 365 St.

Question 165-27 : Which of the following cloud types is least likely to produce precipitation ?

Ci.

exemple 369 Ci.

Question 165-28 : With what type of cloud is heavy precipitation unlikely during the summer months ?

Sc, as.

.cb cumulonimbus and ns nimbostratus produce heavy rain..the only possible answer is sc, as stratocumulus and altostratus..with sc and as you will get light rains. exemple 373 Sc, as.

Question 165-29 : With what type of cloud is '+tsra' precipitation most commonly associated ?

Cb.

exemple 377 Cb.

Question 165-30 : Which of the following causes echoes on meteorological radar screens ?

Hail.

exemple 381 Hail.

Question 165-31 : Which of the following phenomena should be described as precipitation at the time they are observed ?

Sn.

Only sn snow is a precipitation..hz haze.bcfg fog patches..fzfg freezing fog exemple 385 Sn.

Question 165-32 : Which of the following meteorological phenomena can rapidly change the braking action of a runway ?

+fzra

exemple 389 +fzra

Question 165-33 : Which of the following phenomena can produce a risk of aquaplaning ?

+ra

.only ra rain is a precipitation which produce a risk of aquaplaning '+ra' means 'heavy rain'..fg fog..bcfg fog patches..sa sand. exemple 393 +ra

Question 165-34 : Which of these four metar reports suggests that rain is most likely in the next few hours ?

23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 =

. 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 =.cloud base is low, visibility will reduced and temperature and dew point are close, we have a high relative humidity. rain can occur... 16002kt 0100 fg sct300 06/06 q1022 becmg 1000 =.wind 2kt, no clouds, fog it will not lead rain... 05016g33kt 8000 ovc015 08/06 q1028 nosig =.too much wind, visibility remains good... 34004kt 9999 sct040 sct100 m05/m08 q1014 nosig =.too cold, not enough clouds, good visibility and no wind. exemple 397 23015kt 8000 bkn030 ovc070 17/14 q1009 becmg 4000 =

Question 165-35 : Precipitation in the form of showers occurs from ?

Convective clouds

exemple 401 Convective clouds

Question 165-36 : A super cooled droplet is ?

A droplet still in liquid state at a temperature below 0°c.

exemple 405 A droplet still in liquid state at a temperature below 0°c.

Question 165-37 : Steady precipitation, in contrast to showery precipitation falls from ?

Stratiform clouds with little or no turbulence

exemple 409 Stratiform clouds with little or no turbulence

Question 165-38 : Supercooled droplets can occur in ?

Clouds, fog and precipitation

exemple 413 Clouds, fog and precipitation

Question 165-39 : Supercooled droplets are always ?

At a temperature below freezing

exemple 417 At a temperature below freezing

Question 165-40 : The following statements deal with precipitation, turbulence and icing. select the list containing the most likely alternatives for ns cloud ?

Precipitation may be snow, sleet or rain. icing is probable and may range between light and severe. turbulence is rarely more than moderate.

exemple 421 Precipitation may be snow, sleet or rain. icing is probable and may range between light and severe. turbulence is rarely more than moderate.


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