Revision > flight : 8/8 stratus base 200 ft/agl is observed at sunrise at an aerodrome in the north ?

Question 134-1 : Winter ovc base 500 ft/agl summer sct base 3000 ft/agl winter clear sky summer bkn cb base 1500 ft/agl winter bkn base 2500 ft/agl summer bkn base 3500 ft/agl winter sct base 3000 ft/agl summer ovc base 500 ft/agl

exemple 234 winter: ovc, base 500 ft/agl, summer: sct, base 3000 ft/agl. — .winter limited heating during the day will raise the cloud base slightly .summer more heating will raise the cloud base and dissipate some of the cloud .the relatively high pressure 1028 hpa and light winds indicate anticyclonic conditions with stable air winter: ovc, base 500 ft/agl, summer: sct, base 3000 ft/agl.

The dewpoint temperature ?

Question 134-2 : Can be reached by cooling the air whilst keeping pressure constant can be reached by lowering the pressure whilst keeping temperature constant can not be equal to the air temperature can not be lower than the air temperature

exemple 238 can be reached by cooling the air whilst keeping pressure constant — can be reached by cooling the air whilst keeping pressure constant

The amount of water vapour which air can hold largely depends on ?

Question 134-3 : Air temperature stability of air relative humidity the dew point

.the most commonly used measure of humidity is relative humidity relative humidity can be simply defined as the amount of water in the air relative to the saturation amount the air can hold at a given temperature multiplied by 100 air with a relative humidity of 50% contains a half of the water vapor it could hold at a particular temperature . 501. concept of relative humidity.we can say that the amount of water vapour which air can hold largely depends on air temperature

A given mass of air is saturated with water vapour no condensed water.if ?

Question 134-4 : The amount of water vapour remains constant the amount of water vapour decreases relative humidity increases relative humidity remains constant

exemple 246 the amount of water vapour remains constant. — Revised ecqb03 july 2016 the amount of water vapour remains constant.

Which of the following changes of state is known as freezing ?

Question 134-5 : Liquid to solid gas to solid liquid to gas solid to liquid

exemple 250 liquid to solid. — Cqb15 july 2011 liquid to solid.

Consider a parcel of air which is moved upwards in the surrounding air by an ?

Question 134-6 : Tends to gain altitude after being released tends to maintain its new altitude after being released tends to return to its original altitude when it is released tends to descend when it is released it will move to and maintain an altitude below its original altitude

exemple 254 tends to gain altitude after being released. — Take parcels of air that are initially in equilibrium with their environment by equilibrium we mean that the temperature density of the air inside a stationary parcel is the same as its environment now give a parcel of air a push upward for a parcel in contact with the ground an upward push is the only choice possible but air parcels aloft may be given a push upward or downward to test their stability if after a push upwards the test parcel returns to its original position the layer of the atmosphere where the test took place is said to be stable .the atmosphere is unstable when if a parcel starting at equilibrium is displaced slightly upward relative to its surrounding environment it finds itself warmer than its environment at its new altitude and therefore continues to rise spontaneously away from its starting point tends to gain altitude after being released.

In which of the following changes of state is latent heat absorbed ?

Question 134-7 : Liquid to gas liquid to solid gas to solid gas to liquid

exemple 258 liquid to gas. — Easa 2014...latent heat is absorbed when going from liquid to gas solid to liquid solid to gas .latent heat is released when going from gas to liquid liquid to solid gas to solid liquid to gas.

In which of the following changes of state is latent heat released ?

Question 134-8 : Gas to solid solid to liquid solid to gas liquid to gas

exemple 262 gas to solid. — Easa 2014...latent heat is absorbed when going from liquid to gas solid to liquid solid to gas .latent heat is released when going from gas to liquid liquid to solid gas to solid gas to solid.

What is foehn wind ?

Question 134-9 : It is an adiabatically heated wind blowing down a mountain side the temperature on the lee side is normally higher than on the windward side of the mountain at the same level it is a flow of warm air up a slope of a hill caused by surface heating it is a warm and moist anabatic wind that usually carries precipitation it is an adiabatically heated wind blowing down a mountain side the temperature on the lee side is normally lower than on the windward side of the mountain at the same level

exemple 266 it is an adiabatically heated wind blowing down a mountain side. the temperature on the lee side is normally higher than on the windward side of the mountain at the same level. — it is an adiabatically heated wind blowing down a mountain side. the temperature on the lee side is normally higher than on the windward side of the mountain at the same level.

What is 'mixing ratio' ?

Question 134-10 : The number of grammes of water vapour per kilogramme of dry air the percentage of water drops per volume unit of dry air the volume of water vapour which is mixed with each volume unit of dry air the ratio between actual water vapour content and saturated water vapour content

exemple 270 the number of grammes of water vapour per kilogramme of dry air. — the number of grammes of water vapour per kilogramme of dry air.

A night in january has been cold and clear in the forenoon of the next day an ?

Question 134-11 : The aircraft suffers reduced lift and thrust due to a temperature inversion at the top of the fog the additional weight gained by water which has been gathered on wings and fuselage during flight through the fog reduces the lift the water which has been gathered during flight through the fog modifies the aerodynamic properties of the aircraft thus reducing lift the aircraft is under influence of a mountain breeze descending air from the surrounding hills due to the incident sunshine

exemple 274 the aircraft suffers reduced lift and thrust due to a temperature inversion at the top of the fog. — the aircraft suffers reduced lift and thrust due to a temperature inversion at the top of the fog.

Which of the following changes of state is known as melting ?

Question 134-12 : Solid to liquid solid to gas liquid to solid liquid to gas

exemple 278 solid to liquid. — solid to liquid.

In which of the following changes of state is latent heat absorbed ?

Question 134-13 : Solid to liquid liquid to solid gas to solid gas to liquid

exemple 282 solid to liquid. — Easa 2014...latent heat is absorbed when going from liquid to gas solid to liquid solid to gas .latent heat is released when going from gas to liquid liquid to solid gas to solid solid to liquid.

Which of the following changes of state is known as evaporation ?

Question 134-14 : Liquid to gas liquid to solid gas to solid solid to liquid

exemple 286 liquid to gas. — Ecqb01 2013 liquid to gas.

Which of the following changes of state is known as condensation ?

Question 134-15 : Gas to liquid gas to solid liquid to gas liquid to solid

exemple 290 gas to liquid. — Ecqb01 2013 gas to liquid.

Check the correctness of the following statements .1 the maximum water vapor ?

Question 134-16 : 1 is incorrect and 2 is correct 1 and 2 are incorrect 1 is correct and 2 is incorrect 1 and 2 are correct

exemple 294 1 is incorrect and 2 is correct. — .when the dew point is lower than oat the air is unsaturated .when the dew point is equal to oat the air is saturated 1 is incorrect and 2 is correct.

In an isothermal layer the state of the atmosphere is ?

Question 134-17 : Absolutely stable absolutely unstable neutral conditionally unstable

exemple 298 absolutely stable. — Easa 2014...an isothermal layer is a layer of air in which the temperature remains constant with height.for example the layer just above the tropopause is absolutely stable from 12 km to 25 km the temperature does not vary with height it is an isothermal layer where we have absolute stability absolutely stable.

In which of the following changes of state is latent heat absorbed ?

Question 134-18 : Solid to gas liquid to solid gas to solid gas to liquid

exemple 302 solid to gas. — Easa 2014...latent heat is absorbed when going from liquid to gas solid to liquid solid to gas .latent heat is released when going from gas to liquid liquid to solid gas to solid solid to gas.

Given the following information what is the approximate relative humidity of ?

Question 134-19 : 75% 50% 55% 95%

exemple 306 75%. — .usually we need to know the 'water pressure of water' .since this data is not given we can use this basic formula.relative humidity = dew point / temperature x 100..relative humidity = 10 / 15 x 100 = 67%.closest answer is 75% 75%.

As regards water which state change process delivers the main part of the ?

Question 134-20 : Condensation freezing evaporation sublimation

exemple 310 condensation. — Ecqb03 july 2016 condensation.

Several physical processes contribute to atmospheric warming which of the ?

Question 134-21 : Convection and condensation solar radiation and conduction absorption and vaporisation absorption and evaporation

exemple 314 convection and condensation. — convection and condensation.

What is the mean temperature deviation from isa for the frankfurt roma route . ?

Question 134-22 : 4°c colder than isa 4°c warmer than isa 10°c colder than isa 10°c warmer than isa

exemple 318 4°c colder than isa. — 4°c colder than isa.

During a high altitude flight favourable contrail formation conditions are ?

Question 134-23 : High humidity low temperatures and presence of aerosols high humidity low temperatures and absence of aerosols low humidity high temperatures and presence of aerosols high humidity high temperatures and presence of aerosols

exemple 322 high humidity, low temperatures and presence of aerosols. — high humidity, low temperatures and presence of aerosols.

An inversion is a layer of air in which the temperature ?

Question 134-24 : Increases with increasing altitude decreases by more than 1°c per 100 m with altitude decreases by less than 1°c per 100 m with altitude remains unchanged with increasing altitude

exemple 326 increases with increasing altitude. — increases with increasing altitude.

In which of these cloud types can icing be virtually ruled out ?

Question 134-25 : Cirrus ci stratocumulus sc nimbostratus ns cumulus cu

exemple 330 cirrus (ci). — .cirrus clouds are very high clouds and they are composed of ice crystals .cirrus clouds do not result in structural icing the reason for that is the moisture is already frozen in the form of ice crystals and it doesn't deposit on the airframe as do super cooled water droplets which might exist in stratus or cumulus clouds . 642 cirrus (ci).

The most likely reason for radiation fog to dissipate or become low stratus is ?

Question 134-26 : Increasing surface wind speed an increasingly stable atmosphere surface cooling a low level temperature inversion

exemple 334 increasing surface wind speed. — increasing surface wind speed.

What conditions are most likely to lead to the formation of hill fog ?

Question 134-27 : Humid stable air mass wind blowing towards the hills high relative humidity wind blowing parallel in range and an unstable air mass clear skies calm or light winds with relatively low humidity precipitation which is lifted by the action of moderate winds striking the range

exemple 338 humid stable air mass, wind blowing towards the hills. — humid stable air mass, wind blowing towards the hills.

Clouds fog or dew will always be formed when ?

Question 134-28 : Water vapour condenses water vapour is present relative humidity reaches 98% temperature and dew point are nearly equal

exemple 342 water vapour condenses. — .a cloud is a large collection of very tiny droplets of water or ice crystals fog and dew are a collection of very tiny droplets of water .condensation is the process by which water vapor in the air is changed into liquid water water vapour condenses.

Which of the following is a cause of stratus forming over flat land ?

Question 134-29 : Radiation during the night from the earth surface in moderate wind unstable air convection during the day the release of latent heat

exemple 346 radiation during the night from the earth surface in moderate wind. — radiation during the night from the earth surface in moderate wind.

Which of the following processes within a layer of air may lead to the building ?

Question 134-30 : Convection radiation subsidence frontal lifting within stable layers

What are the characteristics of cumuliform clouds ?

Question 134-31 : Large water droplets instability turbulence showers and mainly clear ice small water droplets stability no turbulence and extensive areas of rain large water droplets stability no turbulence showers and mainly rime ice small water droplets instability turbulence extensive areas of rain and rime ice

exemple 354 large water droplets, instability, turbulence, showers and mainly clear ice. — large water droplets, instability, turbulence, showers and mainly clear ice.

Which of the following clouds are classified as medium level clouds in ?

Question 134-32 : As ac sc ns ci cc cs st

Which one of the displayed cloud forms is representative of altocumulus ?

Question 134-33 : N°3 n°1 n°2 n°4

What is the main composition of clouds classified as 'high level clouds' ?

Question 134-34 : Ice crystals supercooled water droplets water droplets water vapour

exemple 366 ice crystals. — .cirrus cirrocumulus and cirrostratus clouds are very high clouds and they are composed of ice crystals . 503 ice crystals.

A plain in western europe with an average elevation of 500 m 1600 ft above sea ?

Question 134-35 : 7000 15000 ft above the terrain 100 1500 ft above the terrain 1500 7000 ft above the terrain 15000 25000 ft above the terrain

exemple 370 7000 - 15000 ft above the terrain. — . 503.altocumulus clouds are found at a mid level between 6000 and 20000 feet .there are 3 basic types of middle level clouds altocumulus altostratus and nimbostratus 7000 - 15000 ft above the terrain.

Which of the following clouds may extend into more than one level ?

Question 134-36 : Nimbostratus stratus altocumulus cirrus

exemple 374 nimbostratus. — . 503 nimbostratus.

Which one of the following types of cloud is most likely to produce heavy ?

Question 134-37 : Ns st cs sc

exemple 378 ns. — .shower rain/snow towering cumulus cumulus and cumulonimbus.continuous rain/snow nimbostratus.shower rain short duration rain.continuous rain long duration = heavy precipitation ns.

With what type of clouds are showers most likely associated ?

Question 134-38 : Cumulonimbus stratocumulus nimbostratus stratus

exemple 382 cumulonimbus. — .shower rain/snow towering cumulus cumulus and cumulonimbus.continuous rain/snow nimbostratus.shower rain short duration rain.continuous rain long duration = heavy precipitation cumulonimbus.

At what time of day or night is radiation fog most likely to occur ?

Question 134-39 : Shortly after sunrise at sunset late evening shortly after midnight

exemple 386 shortly after sunrise. — shortly after sunrise.

What is the average vertical extent of radiation fog ?

Question 134-40 : 500 ft 2 000 ft 5 000 ft 10 000 ft

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