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Question 174-1 : Which of the following statements concerning the airflow during the summer monsoon is correct ? [ Practice protocol ]
Southwesterly airflow over india.
Question 174-2 : What are the typical weather conditions in a cold air pool in summer ?
Precipitation is predominant.
Question 174-3 : The trade winds on the northern hemisphere blow from ?
North east.
Ecqb01 2013... 596..
Question 174-4 : Central europe is situated in the zone of ?
Mid latitude climate.
Ecqb01 2013
Question 174-5 : Which of the following situations will be typical for the intertropical convergence zone ?
Low pressure and instability.
Ecqb01 june 2013
Question 174-6 : With regard to temperature, which of the following is correct for the polar climates ?
The mean temperature of all months is below plus 10°c.
Easa 2014...the polar climate regions are characterized by a lack of warm summers. every month in a polar climate has an average temperature below 10°c. regions with polar climate cover more than 20% of the earth. the sun shines for long hours in the summer, and for many fewer hours in the winter. a polar climate results in treeless tundra, glaciers, or a permanent or semi permanent layer of ice. it has cool summers and very cold winters.
Question 174-7 : What are the typical weather conditions in a westerly situation ?
Very changeable.
. 596.westerlies average latitude are 50°n and 50°s...a series of fronts or depressions, one after the other, is referred to as a westerly wave. the weather conditions are very changeable.
Question 174-8 : How is an easterly wave identifiable on a surface weather chart ?
As a weak trough.
Easa 2014....easterly waves are 'long waves' that occur within the trade wind belt, start over north western africa, and propagate toward the west in the lower tropospheric tradewind flow across the atlantic ocean...approximate location, amplitude and wavelength of easterly waves. 495..at first, an easterly wave has a small amplitude, and produces mild rain showers. powerful thunderstorms and the force of high altitude winds amplify the wave when atmospheric conditions are favourable. several severe thunderstorms begin to form, and eventually a tropical storm may develop... 638.thunderstorms are most likely to develop on the east side of the wave.
Question 174-9 : The main icing zone in the itcz is located between ?
Fl 160 fl 260.
Question 174-10 : The mean top of a thunderstorm cluster in the tropics is up to ?
50000 ft.
Question 174-11 : What is the reason for seasonal changes in climate ?
Because the earth's spin axis is inclined to the plane of its orbit round the sun.
Question 174-12 : In the central part of the atlantic ocean between 10°s and 20°s the prevailing winds are ?
Se trade winds.
.take care this question exists with 10°n and 20°n , answer is 'ne trade winds'.. 584.the question asks for the prevailing winds only between 10°n and 20°n above the atlantic ocean.. 2537
Question 174-13 : The intertropical convergence zone ?
Is characterized by different wind directions on both sides of the zone.
Question 174-14 : In the indian ocean, the name given to the violent tropical storms that can be encountered is ?
Tropical cyclone.
.cyclone, from greek 'kuklos' means 'circle' is a generic term for all tropical revolving storms. according to the geographical location, the terminology differs..cylcone in the south western and northern pacific ocean and the south western indian ocean...hurricane as derived from huracàn, a taino and carib god, or hunraken, the mayan storm. in the northern atlantic ocean and the north eastern and south western pacific ocean east of 160e...typhoon from chinese t'ai fung located in in the north western pacific ocean.. 603
Question 174-15 : The average speed of a tropical cyclone is ?
Less than 60 kt.
Question 174-16 : What is the effect of a strong low level inversion ?
It promotes vertical wind shear.
. 646
Question 174-17 : You are flying with an outside air temperature of 12°c and a tas of 250 kt at fl 150 through 8 oktas ns. what type and degree of icing is most probable ?
In clouds pushed up against the mountains, moderate to severe mixed ice.
.in clouds pushed up against the mountains, the lifting action orographic will mean that larger super cooled water droplets are present, which will increase the severity of the icing to moderate to severe..at 12°c this is a temperature where there will be some clear ice and some rime ice.
Question 174-18 : You intend to carry out a vfr flight over the alps, on a fine and hot summer day. what is the best time of day to conduct this flight ?
Morning.
.the minimum temperature is reached not long after sunrise, and on a fine and hot summer day, convection currents will increase wind speed and turbulence along the day. furthermore, in the evening over the alps, in summer, risks of thunderstorm due to orographic lifting and instability is high..calmest conditions will be in the morning.
Question 174-19 : At what time of the year are tornadoes most likely to occur in north america ?
Spring, summer.
Fonsvanheertum.tornadoes in n america are hurricanes, no my book says that they appear from june until nov... so shouldn't the answer summer, autumn be correct.. .hurricanes are tropical revolving storms.. 493.tornadoes are large funnel cloud with water spouts, associated with very large cumulonimbus clouds. these cb clouds need maximum convective lifting and this will be there in spring/summer.
Question 174-20 : In central europe when is the greatest likelihood for thunderstorms due to warm updrafts ?
Mid afternoon.
Question 174-21 : During which stage of thunderstorm development are rotor winds characterized by roll clouds most likely to occur ?
Mature stage.
. 494
Question 174-22 : Where is a squall line to be expected ?
In front of an active cold front.
.when many individual thunderstorms organize into a nearly continuous line, a squall line is born. they can be more than 80 nm long and often form 40 to 130 nm ahead of advancing cold fronts. racing along, squall line thunderstorms blast the ground with torrents of rain and hail, driven by winds gusting higher than 50 kt.
Question 174-23 : What are squall lines ?
Bands of intensive thunderstorms.
.when many individual thunderstorms organize into a nearly continuous line, a squall line is born. they can be more than 80 nm long and often form 40 to 130 nm ahead of advancing cold fronts. racing along, squall line thunderstorms blast the ground with torrents of rain and hail, driven by winds gusting higher than 50 kt.
Question 174-24 : In which of these temperature bands is ice most likely to form on the aircraft's surface ?
0°c to 10°c
Question 174-25 : Which of the following statements is true regarding moderate to severe airframe icing ?
It is likely to occur in nimbostratus cloud.
.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 airframe icing not moderate or severe. on the top of a cumulonimbus, temperature is too cold..it will not always occurs in altostratus cloud, it dépends on the air mass temperature.
Question 174-26 : Which of the following statements is true regarding moderate to severe airframe icing ?
It will not occur in clear sky conditions.
.ns nimbostratus produces heavy rain, if the rain falls through a cold air mass below the freezing level , moderate to severe airframe icing is likely to occur..it will not always occurs in altostratus cloud, it dépends on the air mass temperature..in clear air, you can only have light airframe icing not moderate or severe. on the top of a cumulonimbus, temperature is too cold.
Question 174-27 : Which of the following conditions is most likely to cause airframe icing ?
+fzra
Question 174-28 : Rime ice forms through the freezing onto aircraft surfaces of ?
Small supercooled water drops.
. clear ice forms on an aircraft by the freezing of large supercooled water drops.. rime ice forms through the freezing onto aircraft surfaces of small supercooled water drops.
Question 174-29 : How does a pilot react to heavy freezing rain at 2000 ft/agl, when he is unable to deice, nor land ?
He turns back before the aircraft loses manoeuvrability.
.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..at 2000 ft above ground level, descending could be dangerous and you are not sure to reach enough warmer air to deice.. 505.remain at the same altitude will give a dangerous build up of ice on the airframe..ascend into cold air means you will not lose the ice and climbing into frontal cloud will give more ice..the best solution is to turn back, to get out of this freezing rain quickly.
Question 174-30 : In which of the following conditions is moderate to severe airframe icing most likely to be encountered ?
In nimbostratus cloud.
.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.
Question 174-31 : What flying conditions are normally encountered when flying in cirrus clouds ?
Average horizontal visibility more than 1000 m, nil icing.
Question 174-32 : How does freezing rain develop ?
Rain falls through a layer where temperatures are below 0°c.
. 505.freezing rain is encountered ahead of a warm front, in winter and in summer and sometimes behind a cold front.
Question 174-33 : What weather conditions in the region of the alps would you expect with foehn from south ?
Clouds, on the southern sides of passes in the alps.
. 520.the southerly wind will give a foehn 'from south' clouds on the southern side.
Question 174-34 : Under which conditions would you expect the heaviest clear ice accretion to occur in a cb ?
Between 2°c and 15°c.
Arizona.there is another question that states that as water droplets are bigger in cumulus clouds clear ice would appear between 0 to 23 degrees..so why isnt answer 'between 20 and 30' correct.. .the question you are talking about is.'ice accretion to the airframe is likely to be most hazardous at temperatures.between 0°c and 23°c in large cu'..explanation for this question the most severe icing is clear ice. clear ice will form in stratus between 0ºc and 7ºc but in cumulus the larger droplet size will give clear ice at temperature between 0ºc and 23ºc...since the clear ice accretion can occur at temperatures warmer than 20°c, the answer between 2°c and 15°c is the most correct one.
Question 174-35 : Clear ice forms on an aircraft by the freezing of ?
Large supercooled water drops.
. clear ice forms on an aircraft by the freezing of large supercooled water drops.. rime ice forms through the freezing onto aircraft surfaces of small supercooled water drops.
Question 174-36 : What weather conditions would you expect at a squall line ?
Thunderstorms.
.when many individual thunderstorms organize into a nearly continuous line, a squall line is born. they can be more than 80 nm long and often form 40 to 130 nm ahead of advancing cold fronts. racing along, squall line thunderstorms blast the ground with torrents of rain and hail, driven by winds gusting higher than 50 kt.
Question 174-37 : What is the approximate maximum diameter of a the area affected by damaging winds at the surface caused by a microburst ?
4 km.
.a microburst/downburst is a localized area of damaging winds caused by air rapidly flowing down and out of a thunderstorm. a microburst occurs when cold air high in a thunderstorm descends and accelerates. as the stream of cold air reaches the ground, it spreads out and can accelerate even further.
Question 174-38 : In general, the visibility during rainfall compared to during drizzle is ?
Greater.
. 521.the two forms of liquid precipitation, drizzle and rain, are classified in a number of ways depending on the size of the drops, the visibility associated with the precipitation and the rate at which it falls...drizzle, which is defined as drops with diameters less than 0.02 inches falling close together, usually falls from stratus clouds. the relatively thin stratus clouds have slow, upward moving air currents. in these conditions, cloud droplets have little time to grow before they become too heavy for the air currents to support. the drops fall to the ground, appearing to float in air currents. as seen in the graphic above, the intensity of drizzle is based on the visibility at the time the precipitation is falling...rain, which is composed of widely separated drops with diameters usually greater than 0.02 inches, generally falls from towering cumulus clouds. the cumulus clouds, with fast, upward moving air currents, allow cloud droplets to combine and grow. raindrops can reach sizes up to 0.25 inches before falling to the ground. the intensity of rain is based on the amount that falls in one hour. the intensity can also be estimated visually.
Question 174-39 : Which of the following symbols represents a squall line. 264 ?
Symbol 1
.icao annex 3 meteorological service for international air navigation. 547
Question 174-40 : Over madrid, what intensity of turbulence and icing is forecast at fl 200 . 267 ?
Moderate turbulence, moderate icing.
.icao annex 3 meteorological service for international air navigation. 547.bkn ovc lyr broken overcast layer.moderate icing from fl100 to fl210..moderate turbulence from fl100 to fl210.
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