HACER TEST

ATPL 50 METEOROLOGY

50.02 WIND

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

Increasing surface wind speed.

2 The geostrophic wind is greater than the gradient wind around a low pressure system because the

Centrifugal force opposes the pressure gradient

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

Humid stable air mass, wind blowing towards the hills.

4 Where, during a flight from marseille to dakar, in july, may the itcz be encountered?

In the vicinity of dakar

5 Which wind systems converge on the itcz, when it lies at the equator?

Se trade winds and ne trade winds

6 An aircraft is flying in the southern hemisphere at low altitude (less than 2000 feet) and going directly away from a centre of low pressure. what direction, relative to the aircraft, does the wind come from ?

From the left and slightly on the nose

7 The geostrophic wind is less than the gradient wind around an anticyclone because the

Centrifugal force is added to the pressure gradient

8 (for this question use annex 050-2422a) which of the following symbols represents a tropical revolving storm?

Symbol a)

9 (for this question use annex 050-2421a) which of the following symbols represents a squall line?

Symbol a)

10 Which weather chart icing and the height of the freezing level ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Significant weather

11 An aircraft is approaching a cold front from the warm air mass side at fl 270 and experiencing moderate to severe turbulence. a jet stream is forecast to be at fl 310. the shortest way to get out of this turbulence is by :

Descending

12 When in the upper part of a layer warm air is advected the

Stability increases in the layer

13 If you have to fly through a warm front when freezing level is at 10000 feet in the warm air and at 2000 feet in the cold air, at which altitude is the probability of freezing rain the lowest ?

12000 feet

14 Which type of fog is likely to form when air having temperature of 15° c and dew point of 12° c blows at 10 knots over a sea surface having temperatures of 5° c ?

Advection fog

15 What characterizes a stationary front ?

The surface wind usually has its direction parallel to the front

16 How are the air masses occlusion ? is behind the behind the occlusion. front of the occlusion. cold air in front of the level. level.

The coldest air mass and the warm air in the less cold air mass is above ground level.

17 In the lower part of the

Is almost constant

18 In an air mass with no

Stable clouds the surface temperature is 15° c and 13° c this layer of air is:

19 A layer can be

Stable for unsaturated air and unstable for saturated air

20 A zone of strong convection currents is encountered during a flight. in spite of moderate gust you decide to continue the flight. what are your precautionary measures?

Decrease the speed / try to climb above the zone of convective currents if aircraft performance parameters allow.

21 What type of clouds are associated with snow showers ?

Cumulus and cumulonimbus

22 What the low level wind system between the subtropical high pressure belt and the equatorial trough of low pressure (itcz) ?

Trade winds.

23 What type of clouds are associated with rain showers ?

Towering cumulus and cumulonimbus.

24 What characteristic is

Stability

25 A frontal depression

Continuous rain or about 12 hours until the warm front arrives. within the warm sector the rain increases. improvement on the passage of the cold front.

26 What types of cloud will a warm front ? later at some 250 km 300 km ns until the the front ns begin 80 km before the front thickening as front cb

At some 800 km cs, the front, groups of cb,

27 The diurnal variation in temperature is largest when the sky is

Clear and winds are weak

28 The radiation of the sun heats

The surface of the earth, which heats the air in the troposphere

29 Subsidence is :

Vertically downwards motion of air

30 Advection is :

Horizontal motion of air

31 Frontal depressions can be assumed to move in the direction of the 2000 feet wind subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

In the warm sector

32 (for this question use annex 050- 2539a) the front labelled "z" is a:

W arm front

33 The dry adiabatic lapse rate than in winter night than during the value day

Has a constant fixed

34 An air mass is called stable when

The vertical motion of rising air tends to become weaker and disappears

35 An inversion is a layer of air which is

Absolutely stable

36 Around paris on january 3rd at 1800 utc, the surface temperature, under shelter, is 3° c. the sky is covered by 8 oktas of stratus. qnh is 1033 hpa. if the sky is covered all night, the minimum temperature of the night of january 3rd to january 4th should be

Slightly below +3° c.

37 On a clear sky, continental ground surface, wind calm, the minimum temperature is reached approximately

Half an hour after sunrise

38 From what type of cloud does drizzle fall ?

Stratus.

39 In which month does the humid monsoon in india start?

In june.

40 What is normally the most effective measure to reduce or avoid cat effects?

Change of flight level.

41 The dry adiabatic lapse rate has a value of

1° c/100m

42 The environmental atmosphere

Varies with time 2° c/1000 ft

43 An inversion is a layer

Increases with height more than 1° c/100m

44 An isothermal layer is a

Remains constant with a constant rate

45 During july flights from bangkok (13° n - 100° e) to karachi (25° n - 67° e) experience an average tailwind component of 22 kt. in january the same flights, also operating at fl 370, have an average headwind of 50 kt. what is the reason for this difference?

The wind components correspond to the seasonal change of the regional wind system.

46 A significant inversion at low height is a characteristic of

Nocturnal radiation

47 An inversion is

An increase of temperature with height

48 From which of the following pieces of information can the stability of the atmosphere be derived?

Environmental lapse rate

49 A super-cooled droplet is one that

Remains liquid at a below freezing temperature

50 Freezing fog consists of

Supercooled water droplets

51 Which of the following is most likely to lead to the dissipation of radiation fog ?

A marked increase in wind velocity near the ground sinking air mass

52 Freezing rain occurs when

Rain falls into a layer of above-freezing layer of below 0° c

53 Which of the following is true concerning an aircraft that is flying at fl180 in the northern hemisphere, where wind is geostrophic and the true altitude remains constant ?

There is no cross wind

54 W hilst flying at fl 180 on the northern hemisphere an aircraft experiences right drift. what effect, if any, will this have on the aircraft"s true altitude ?

It decreases

55 Which of the following conditions is most likely to lead to the formation of steam fog (arctic smoke)?

Cold air moving over warm water

56 What type of cloud can produce hail showers?

Cb

57 Along the west coast of india the prevailing winds are the

Sw monsoon in july and a ne monsoon in january

58 Which of the following statements concerning trade winds is correct?

They occur only in the lower part of the troposphere and more pronounced over the oceans

59 An isohypse of the 500 hpa pressure surface is labelled with the number 552. this means that for all points on the isohypse the

Topography is 552 decameters above msl

60 In still air the temperature decreases at an average of 1.2° c per 100 m increase in altitude. this temperature change is called:

Environmental lapse rate

61 Large hail stones

Are typically associated with severe thunderstorms

62 What information is given on a significant w eather chart?

The significant weather forecast for the time given on the chart

63 The prevailing surface wind in the area of the west coast of africa north of the equator (gulf of guinea) is a subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Sw monsoon in summer and ne tradewind in winter

64 An easterly wave is a

Wave-like disturbance in the monsoon regime of india, moving from east to west, with severe convective activity ahead of its trough

65 Which of the following statements concerning the intertropical convergence zone is true?

It lies totally in the northern hemisphere in july and totally in the southern hemisphere in

66 The transition from sw to ne monsoon in india occurs in

July, august, september

67 A blocking anticyclone on the northern hemisphere is

Quasi stationary/situated between 50° n and between 50° n and 70° n 70° n/a cold anticyclone

68 Freezing precipitation occurs

Mainly in the form of freezing rain or freezing drizzle

69 Supercooled droplets can be encountered

At any time of the year

70 Supercooled droplets are always

At a temperature below freezing

71 Supercooled droplets can occur in

Clouds, fog and precipitation

72 Several physical

Convection and evaporation.

73 A layer is conditionally

Is unstable for saturated air as well as for dry air.

74 The temperature at fl 140 is -12° c. what will the temperature be at fl 110 if the icao standard lapse rate is applied ?

-6° c.

75 Which of the following is a common cause of ground or surface temperature inversion ?

Terrestrial radiation on a clear night with no or very light winds.

76 At a certain position, the temperature on the 300 hpa chart is -48° c. according to the tropopause chart, the tropopause is at fl 330. what is the most likely temperature at fl 350 ?

-54° c.

77 Which of the following conditions is most likely to lead to the formation of advection fog ?

Moist warm air moving over a cold surface

78 The turbulence which occurs at high flight levels (above fl 250) is mainly of the type clear air turbulence. in what way can moderate to severe clear air turbulence affect an aircraft, the flight and the passengers?

The turbulence is a small scale one and can cause damage of worn out type. the manoeuvring of the aircraft will be made more difficult or even impossible. for the passengers the flight will be unpleasant.

79 A flight is to depart from an airport with runways 09 and 27. surface wind is 270/05. an inversion is reported at 300 feet with turbulence and wind shear. the wind just above the inversion is 090/30. what is the safest departure procedure ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Depart on runway 09 with a tailwind.

80 What is the name of the wind or airmass which gives to the main part of india its greatest proportion of precipitation?

South-west monsoon.

81 Which one of the following statements is correct concerning the movement of the itcz in the region of west africa?

It reaches its maximum northerly position of 15° - 20° n in july

82 How is the direction and speed of upper winds described in forecasts ?

The direction is relative to true north and the speed is in knots.

83 What cloud cover is typical for a wide warm sector of a polar front depression over central europe in the summer ?

Fair weather cu

84 How do air masses subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

W arm air overrides a cold air mass

85 What is the relative movement of the two airmasses along a cold front ?

Cold air pushes under a warm air mass

86 Which of the following describes a warm occlusion?

The coldest air mass is ahead of the original warm front

87 When do cold occlusions occur most frequently in europe?

Summer

88 In which main direction does a polar front depression move?

Along the front towards the east

89 (for this question use annex 050-2388a) what change in pressure, will occur at point a, during the next hour? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

A rise in pressure

90 How are high level condensation trails formed that are to be found occasionally behind jet aircraft ? flying through relatively warm but humid air

Through water vapour released during fuel combustion

91 What type of precipitation would you expect at an active unstable cold front?

Showers associated with thunderstorms

92 (for this question use annex 050-2058a) what does the symbol indicate on a significant weather chart?

The center of a tropopause "high", where the tropopause is at fl 400.

93 What positions are connected with contour lines on the weather chart?

Positions with the same height in a chart of constant pressure.

94 In which meteorological forecast chart is information about cat regions found? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Significant weather chart.

95 On which of the

Significant weather chart.

96 How are well separated cb clouds described on the significant w eather chart?

Ocnl cb.

97 If the pressure surfaces bulge upwards in all levels then the pressure system is a

Warm high

98 (for this question use annex 050-2060a) which one of the tracks (dashed lines) is represented by the cross-section shown on the left ?

Track d-a

99 (for this question use annex 050-2064a) refer to the diagram. assuming the usual direction of movement, where will this polar frontal wave have moved ?

Position 3

100 The 0° isotherm is forecast to be at fl 50. at what fl would you expect a temperature of -6° c?

Fl 80

101 Which of the following

Low cloud base and surface visibility, and isolated thunderstorms.

102 What are the surface.

Radiation fog forms by surface cooling in a calm wind. advection fog is formed by evaporation over the sea.

103 What is the most likely temperature at the tropical tropopause?

-75° c.

104 In the southern hemisphere what wind effect would you expect when flying from a high pressure area towards a low pressure area at fl 100? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

W ind from the right.

105 With what type of clouds are showers most likely associated?

Cumulonimbus.

106 At what time of day, or

Shortly after sunrise.

107 What is the average vertical extent of radiation fog?

500 ft.

108 When does frontal fog, also known as mixing fog, occur?

When very humid warm air meets with very humid cold air.

109 What wind conditions, occuring 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.

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

Light wind, little or no cloud, moist air.

111 The stable layer at some height in the low troposphere of an older high pressure area in the mid-latitudes is called

Subsidence inversion

112 The range of wind speed in which radiation fog is most likely to form is :

Below 5 kt

113 During a cross-country flight at fl 50, you observe the following sequence of clouds: nimbostratus, altostratus, cirrostratus, cirrus. which of the following are you most likely to encounter ?

Decreasing temperatures.

114 Which one of the following types of cloud is most likely to produce heavy precipitation ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Ns.

115 What characteristics

Strong and flowing to the isobars.

116 Which forces are

Pressure gradient balanced with geostrophic winds?

117 How does moderate

Changes in altitude or environment will result in structural damage.

118 What type of fronts are present during the winter in central europe when temperatures close to the ground are below 0° c, and freezing rain starts to fall?

W arm fronts, warm

119 In temperate latitudes what weather conditions may be expected over land during the summer in the centre of a stationary high pressure zone ?

Calm winds, haze.

120 At what time of the year, are the paths of north atlantic lows moving from west to east generally at their most southerly position?

W inter.

121 What is the correct

Subsidence.

122 What weather is

Thunderstorms and

123 What winds are mainly associated with the winter monsoon in the monsoon regions of the indian sub-continent ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Northeasterly winds bringing dry and hazy air.

124 What is the most likely cause of a lack of clouds at higher levels in a stationary high?

Sinking air

125 In which of the following bands of latitude is the intertropical convergence zone most likely to be encountered in january, between dakar and rio de janeiro?

0° - 7° n.

126 What cloud formation is most likely to occur at low levels when a warm air mass overrides a cold air mass?

Nimbostratus.

127 The approximate

1/150

128 What type of low associated with a surface front? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Polar front low.

129 In which approximate direction does the centre of a frontal depression move?

In the direction of the warm sector isobars.

130 Where is the coldest air to be found, in an occlusion with cold front characteristics?

Behind the front.

131 What type of front / occlusion usually moves the fastest?

Cold front.

132 Over central europe what type of cloud cover is typical of the warm sector of a depression during winter?

St with drizzle.

133 What weather conditions are prevalent during the summer, over the north sea, approximately 300 km behind a quickly moving cold front?

Cloud cover mostly scattered, isolated showers.

134 What surface weather is associated with a stationary high pressure region over land in the winter?

A tendency for fog and low st.

135 Which one of the (itcz) is correct?

Following statements regarding the intertropical convergence zone

136 Which of the following changes of state is known as sublimation?

Solid direct to vapour

137 What weather conditions are indications of the summer monsoon in india?

Thunderstorms, showers of heavy rain.

138 After passing at right angles through a very active cold front in the direction of the cold air, what will you encounter, in the northern hemisphere immediately after a marked change in temperature?

A veering in the wind direction.

139 When are the rainy seasons in equatorial africa?

March to may and october to november.

140 Which of the following best describes the intertropical convergence zone ?

The zone where the trade winds of the northern hemisphere meet those of the

141 What is the surface visibility most likely to be, in a warm sector of tropical maritime air, during the summer?

Moderate (several km).

142 Geostrophic wind is the wind when isobars are

Straight lines and no friction is involved.

143 Which of the following are favourable conditions for the formation of freezing rain?

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

144 The difference between geostrophic wind and gradient wind is caused by

Curvature of isobars

145 The geostrophic wind depends on

Density, earth"s rotation, geographic latitude

146 Divergence in the upper air results, near the surface, in

Falling pressure and likely formation of clouds

147 The wind speed in a system with curved isobars compared to a system with straight isobars is (other conditions being the same)

Higher if curvature is anticyclonic

148 The wind tends to follow the contour lines (isohypses) above the friction layer because

The coriolis force tends to balance with the horizontal pressure gradient force

149 You are flying from east to west in the northern hemisphere at the 500 hpa pressure surface. which of the following statements is correct?

If the wind is from the north you are gaining altitude

150 In an area of converging air

Clouds can be formed

151 W ind is caused by

Horizontal pressure differences

152 Advection fog can be formed when

Warm moist air flows over a colder surface

153 In a warm front occlusion

The warm air is lifted

154 Which of the following circumstances most favour the development of radiation fog?

Moist air over land during clear night with little wind

155 Which of the following statements is true concerning advection fog?

It can be formed suddenly by day or night

156 Steaming fog (arctic sea smoke) occurs in air

With cold mass properties

157 The greater the pressure gradient the

Closer the isobars and the stronger the wind

158 The morning following a clear, calm night when the temperature has dropped to the dewpoint, is likely to produce

Radiation fog

159 When the temperature and dew point are less than one degree apart the weather conditions are most likely to be

Fog or low cloud

160 An observer on the northern hemisphere is under influence of the wind system of a depression, which is moving from west to east. the centre of the depression passes to the south of the observer. for this observer the wind direction is

Continuously backing

161 In a low pressure system the convergence at the surface is caused by

Frictional forces

162 Geostrophic wind

Is perpendicular to the horizontal pressure gradient force

163 The geostrophic wind speed is directly proportional to the

Horizontal pressure gradient

164 Frontal fog is most likely to occur subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

In advance of a warm front

165 When water evaporates

Heat is absorbed decreased

166 Which constant pressure altitude chart is standard for a 4781 ft pressure level (fl50)?

850 hpa.

167 An outside air temperature of -35° c is measured while cruising at fl 200. what is the temperature deviation from the isa at this level?

5° c colder than isa.

168 Convective activity over

Summer in the

169 Absolute instability

Exceeds the dry exists whenever the environmental lapse rate

170 The polar front is the boundary between: air. continental polar air.

Polar air and tropical air.

171 Steady precipitation, in contrast to showery precipitation falls from

Stratiform clouds with little or no turbulence

172 Which of the following is a common result of subsidence ?

An inversion over a large area with haze, mist.

173 Clouds, fog or dew will

Water vapour always be formed when:

174 Precipitation in the form of showers occurs mainly from

Convective clouds

175 A super-cooled droplet is

A droplet still in liquid been frozen during its below freezing

176 The main factor which contributes to the formation of very low clouds ahead of a warm front is the

Saturation of the cold air by rain falling into it and evaporating

177 Areas of sinking air are generally cloudless because as air sinks it

Is heated by compression

178 The most effective way to dissipate cloud is by

Subsidence

179 When isobars, for an area in the mid- latitudes on a weather map, are close together, the wind is most likely to be

Strong

180 The process by which

Sublimation

181 Which is true of the

It is higher in polar difference with change of latitude

182 In zurich during a summer day the following weather observations were taken: 160450z 23015kt 3000 +ra sct008 sct020 ovc030 13/12 q1010 nosig = 160650z 25008kt 6000 sct040 bkn090 18/14 q1010 rera nosig = 160850z 25006kt 8000 sct040 sct100 19/15 q1009 nosig = 161050z 24008kt 9999 sct040 sct100 21/15 q1008 nosig = 161250z 23012kt cavok 23/16 q1005 nosig = 161450z 23016kt 9999 sct040 bkn090 24/17 q1003 becmg 25020g40kt ts = 161650z 24018g35kt 3000 +tsra sct006 bkn015cb 18/16 q1002 nosig = 161850z 28012kt 9999 sct030 sct100 13/11 q1005 nosig = what do you conclude based on these observations? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

A warm front passed the station early in the morning and a cold front during late afternoon

183 (for this question use annex 050-4389a) this chart shows the weather conditions on the ground at 0600 utc on may 4. which of the following reports reflects weather development at geneva airport?

Taf lsgg 230716 23016kt 8000 -ra bkn030 ovc070 becmg 0810 5000 ra bkn020 ovc050 tempo 3000 +ra bkn010 ovc030 becmg 1215 25014kt 8000

184 (for this question use annex 050-10797a) the dotted line designated "z" represents the

Mean position of the intertropical front (itcz) during july

185 (for this question use annex 050-10798a) the dotted line labelled "y" represents the

Mean position of the intertropical convergence zone (itcz) during january

186 Under anticyclone conditions in the northern hemisphere, with curved isobars the speed of the gradient wind is

Greater than the geostrophic wind

187 For the same pressure gradient at 60° n, 50° n and 40° n the speed of the geostrophic wind will be

Greatest at 40° n

188 For a similar pressure gradient, the geostrophic wind speed will be

Greater at 30° n than at 60° n

189 The value of the saturated adiabatic lapse rate is closest to that of the dry adiabatic lapse rate in subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Cirrus

190 The following ns cloud:

Precipitation may be are usually nil. turbulence is rarely more than moderate.

191 Thunderstorms in exceptional circumstances can occur in a warm front if subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

The warm air is convectively unstable.

192 What is the technical term for an increase in temperature with altitude?

Inversion

193 How would you characterise an air temperature of -55° c at the 200 hpa level over western europe?

Within +/-5° c of isa

194 How would you characterise an air temperature of -30° c at the 300 hpa level over western europe?

High

195 How would you characterise an air temperature of -15° c at the 700 hpa level over western europe?

Low

196 A temperature of +15° c is recorded at an altitude of 500 metres above sea level. if the vertical temperature gradient is that of a standard atmosphere, what will the temperature be at the summit of a mountain, 2500 metres above sea level?

+2° c

197 The temperature at fl 160 is -22° c. what will the temperature be at fl 90 if the icao standard lapse rate is applied ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

-8° c

198 The temperature at fl 110 is -5° c. what will the temperature be at fl 50 if the icao standard lapse rate is applied ?

+7° c

199 The temperature at fl 80 is +6° c. what will the temperature be at fl 130 if the icao standard lapse rate is applied ?

-4° c

200 (for this question use annex 050-10801a) w eather conditions at bombay during january are mainly influenced by the

Ne monsoon

201 (for this question use

Ne monsoon and the

202 (for this question use approach to dakar during july? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

W et and thundery due to the rising sand of the harmattan

203 (for this question use annex 050-4333a) which of the following best describes zone a?

Trough of low pressure

204 When planning a flight at fl 110, which upper wind and temperature chart would be nearest your flight level ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

700 hpa

205 When planning a flight at fl 60, which upper wind and temperature chart would be nearest your flight level ?

850 hpa

206 If you are planning a flight at fl 290, which of these upper wind and temperature charts would be nearest your flight level ?

300 hpa

207 If you are planning a flight at fl 170, which of these upper wind and temperature charts would be nearest your flight level ?

500 hpa

208 Which constant pressure altitude chart is standard for a 38662 ft pressure level (fl 390) ?

200 hpa

209 Which constant pressure altitude chart is standard for a 30065 ft pressure level (fl 300)?

300 hpa

210 Which constant pressure altitude chart is standard for a 18289 ft pressure level (fl 180) ?

500 hpa

211 Which constant pressure altitude chart is standard for a 9882 ft pressure level (fl 100) ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

700 hpa

212 (for this question use annex 050-4335a) which of the following best describes zone c?

Ridge of high pressure

213 (for this question use annex 050-4336a) which of the following best describes zone d?

Depression

214 In a polar front depression, an occlusion is called a warm occlusion when the cold air

Behind is less cold than the cold air in front, with the warm air at a high altitude.

215 The intertropical convergence zone (itcz) particularly affects

Western africa between 10° and 20° n and the northern coasts of the parallels, depending on

216 On an aerodrome, when a warm front is approaching

Qfe and qnh decrease.

217 (for this question use annex 050-4334a) which of the following best describes zone b?

Col

218 (for this question use annex 050-4298a) refer to the diagram. assuming the usual direction of movement, to which position will the polar frontal wave have moved ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Position c

219 (for this question use annex 050-4340a) according to icao, which symbol indicates danger to an aircraft in flight?

Symbol c)

220 (for this question use annex 050-4338a) according to icao, which symbol indicates a tropical revolving storm?

Symbol d)

221 (for this question use annex 050-4337a) according to icao, which symbol indicates severe icing ?

Symbol a)

222 An aircraft flying in the southern hemisphere at 2000 feet, has to turn to the right in order to allow for drift. in which direction, relative to the aircraft, is the centre of low pressure ?

In front.

223 Where are you likely to find the strongest winds close to the ground?

In the transition zone between two air masses

224 The upper wind and temperature chart of 250 hpa corresponds, in a standard atmosphere, to about subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

34 000 ft

225 (for this question use annex 050-4297a) examining the pictures, on which one of the tracks (dashed lines) is this cross-section to be expected?

Track b-d

226 Which of the following is typical for the passage of a cold front in the summer ?

Mainly towering clouds

227 What will be the effect on the reading of an altimeter of an aircraft parked on the ground as an active cold front is passing? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

It will first increase then decrease.

228 What will be the effect on the reading of an altimeter of an aircraft parked on the ground shortly before an active cold front passes?

It will be increasing.

229 What will be the effect on the reading of an altimeter of an aircraft parked on the ground during the period following the passage of an active cold front ?

It will have decreased.

230 Read this description: "after such a fine day, the ring around the moon was a bad sign yesterday evening for the weather today. and, sure enough, it is pouring down outside. the clouds are making an oppressively low ceiling of uniform grey. but at least it has become a little bit warmer." which of these weather phenomena is being described?

A warm front

231 With what type of cloud is "+tsra" precipitation most commonly associated?

Cb

232 With what type of cloud is heavy precipitation unlikely during the summer months ? subject/sec aragraph wording domanda rispostaa rispostab rispostac rispostad ck1 ck2 ck3 ck4

Sc, as

233 Which of the following cloud types is least likely to produce precipitation ?

Ci

234 With what type of cloud is "dz" precipitation most commonly associated?

St

235 With what type of cloud is "gr" precipitation most commonly associated?

Cb

236 With which of the following types of cloud is "+ra" precipitation most commonly associated?

Ns

237 Under which of these conditions is radiation fog most likely to form?

Little or no cloud

238 (for this question use annex 050-4339a) according to icao, which symbol indicates danger to an aircraft in flight?

Symbol b)

239 Which of the following is most likely to lead to the formation of radiation fog?

Heat loss from the ground on clear nights

240 The degree of clear air turbulence experiencied by an aircraft is proportional to the

Intensity of vertical and horizontal windshear

241 The presence of ice pellets at the surface is evidence that

Freezing rain occurs at a higher altitude

PREGUNTAS TEMAS PNB PER.