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The dewpoint temperature ? [ Certification weather ]

Question 141-1 : 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

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

Question 141-2 : Air temperature stability of air relative humidity the dew point

Admin .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 exemple 245 Air temperature.Air temperature.

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

Question 141-3 : The amount of water vapour remains constant the amount of water vapour decreases relative humidity increases relative humidity remains constant

Revised ecqb03 july 2016

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

Question 141-4 : Liquid to solid gas to solid liquid to gas solid to liquid

Cqb15 july 2011 exemple 253 Liquid to solid.Liquid to solid.

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

Question 141-5 : 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

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 exemple 257 Tends to gain altitude after being released.Tends to gain altitude after being released.

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

Question 141-6 : Liquid to gas liquid to solid gas to solid gas 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 exemple 261 Liquid to gas.Liquid to gas.

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

Question 141-7 : Gas to solid solid to liquid solid to gas 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 exemple 265 Gas to solid.Gas to solid.

What is foehn wind ?

Question 141-8 : 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 269 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 141-9 : 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 273 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 141-10 : 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 277 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 141-11 : Solid to liquid solid to gas liquid to solid liquid to gas

exemple 281 Solid to liquid.Solid to liquid.

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

Question 141-12 : Solid to liquid liquid to solid gas to solid gas 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 exemple 285 Solid to liquid.Solid to liquid.

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

Question 141-13 : Liquid to gas liquid to solid gas to solid solid to liquid

Ecqb01 2013 exemple 289 Liquid to gas.Liquid to gas.

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

Question 141-14 : Gas to liquid gas to solid liquid to gas liquid to solid

Ecqb01 2013 exemple 293 Gas to liquid.Gas to liquid.

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

Question 141-15 : 1 is incorrect and 2 is correct 1 and 2 are incorrect 1 is correct and 2 is incorrect 1 and 2 are correct

Admin .when the dew point is lower than oat the air is unsaturated .when the dew point is equal to oat the air is saturated exemple 297 1 is incorrect and 2 is correct.1 is incorrect and 2 is correct.

In an isothermal layer the state of the atmosphere is ?

Question 141-16 : Absolutely stable absolutely unstable neutral conditionally unstable

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 exemple 301 Absolutely stable.Absolutely stable.

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

Question 141-17 : Solid to gas liquid to solid gas to solid gas 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 exemple 305 Solid to gas.Solid to gas.

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

Question 141-18 : 75% 50% 55% 95%

Admin .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% exemple 309 75%.75%.

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

Question 141-19 : Condensation freezing evaporation sublimation

Ecqb03 july 2016 exemple 313 Condensation.Condensation.

Several physical processes contribute to atmospheric warming which of the ?

Question 141-20 : Convection and condensation solar radiation and conduction absorption and vaporisation absorption and evaporation

exemple 317 Convection and condensation.Convection and condensation.

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

Question 141-21 : 4°c colder than isa 4°c warmer than isa 10°c colder than isa 10°c warmer than isa

exemple 321 4°c colder than isa.4°c colder than isa.

During a high altitude flight favourable contrail formation conditions are ?

Question 141-22 : 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 325 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 141-23 : 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 329 Increases with increasing altitude.Increases with increasing altitude.

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

Question 141-24 : Cirrus ci stratocumulus sc nimbostratus ns cumulus cu

Admin .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 exemple 333 Cirrus (ci).Cirrus (ci).

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

Question 141-25 : Increasing surface wind speed an increasingly stable atmosphere surface cooling a low level temperature inversion

exemple 337 Increasing surface wind speed.Increasing surface wind speed.

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

Question 141-26 : 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 341 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 141-27 : Water vapour condenses water vapour is present relative humidity reaches 98% temperature and dew point are nearly equal

Admin .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 exemple 345 Water vapour condenses.Water vapour condenses.

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

Question 141-28 : Radiation during the night from the earth surface in moderate wind unstable air convection during the day the release of latent heat

exemple 349 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 141-29 : Convection radiation subsidence frontal lifting within stable layers

exemple 353 Convection.Convection.

What are the characteristics of cumuliform clouds ?

Question 141-30 : 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 357 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 141-31 : As ac sc ns ci cc cs st

Admin . 503 exemple 361 As, ac.As, ac.

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

Question 141-32 : N°3 n°1 n°2 n°4

exemple 365 N°3.N°3.

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

Question 141-33 : Ice crystals supercooled water droplets water droplets water vapour

Admin .cirrus cirrocumulus and cirrostratus clouds are very high clouds and they are composed of ice crystals . 503 exemple 369 Ice crystals.Ice crystals.

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

Question 141-34 : 7000 15000 ft above the terrain 100 1500 ft above the terrain 1500 7000 ft above the terrain 15000 25000 ft above the terrain

Admin . 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 exemple 373 7000 - 15000 ft above the terrain.7000 - 15000 ft above the terrain.

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

Question 141-35 : Nimbostratus stratus altocumulus cirrus

Admin . 503 exemple 377 Nimbostratus.Nimbostratus.

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

Question 141-36 : Ns st cs sc

Admin .shower rain/snow towering cumulus cumulus and cumulonimbus .continuous rain/snow nimbostratus .shower rain short duration rain .continuous rain long duration = heavy precipitation exemple 381 Ns.Ns.

With what type of clouds are showers most likely associated ?

Question 141-37 : Cumulonimbus stratocumulus nimbostratus stratus

Admin .shower rain/snow towering cumulus cumulus and cumulonimbus .continuous rain/snow nimbostratus .shower rain short duration rain .continuous rain long duration = heavy precipitation exemple 385 Cumulonimbus.Cumulonimbus.

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

Question 141-38 : Shortly after sunrise at sunset late evening shortly after midnight

exemple 389 Shortly after sunrise.Shortly after sunrise.

What is the average vertical extent of radiation fog ?

Question 141-39 : 500 ft 2 000 ft 5 000 ft 10 000 ft

exemple 393 500 ft.500 ft.

Which of the following weather conditions favour the formation of radiation fog ?

Question 141-40 : Light wind little or no cloud moist air light wind extensive cloud dry air light wind extensive cloud moist air strong wind little or no cloud moist air

exemple 397 Light wind, little or no cloud, moist air.Light wind, little or no cloud, moist air.

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