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MET-BNC-MODULE5
1.
An aircraft over Western Europe is crossing a jet stream 2500 FT below its core at right angles. While crossing, the outside temperature is increasing. The prevailing wind is
a) from the left.
b) tailwind.
c) from the right
d) headwind.
2.
What name is given to the low level wind system between the subtropical high pressure belt and the equatorial trough of low pressure (ITCZ) ?
a) Trade winds.
b) Monsoon.
c) Doldrums.
d) Westerly winds.
3.
In which zone of a polar front jet stream is the strongest CAT to be expected ?
a) On the tropical air side of the core.
b) About 12000 FT above the core.
c) Exactly in the centre of the core.
d) On the polar air side of the core.
4.
What is the minimum speed for a wind to be classified as a jet stream?
a) 70 kt.
b) 100 kt.
c) 50 kt.
d) 60 kt.
5.
A wind sounding in the region of a polar front jet stream gives the following wind profile (Northern hemisphere). 900hPa 220/20kt 800hPa 220/25kt 700hPa 230/35kt 500hPa 260/60kt 400hPa 280/85kt 300hPa 300/100kt 250hPa 310/120kt 200hPa 310/80kt Which system is the jet stream associated with?
a) With a warm front.
b) With a ITCZ.
c) With an easterly wave.
d) With a cold front.
6.
Where is the most dangerous zone in a tropical revolving storm?
a) In the centre of the eye.
b) About 600 km away from the eye.
c) Anywhere in the eye.
d) In the wall of clouds around the eye.
7.
In the weather briefing room during the pre-flight phase of a passenger flight from Zurich to Rome, you examine the following weather reports of pressing importance at the time: EISN SIGMET 2 VALID 140800/141100 EINN- SHANNON FIR LOC SEV TURB FCST BLW FL050 S OF N53 WKN LIMM SIGMET 2 VALID 140900/141500 LIMM- MILANO UIR MOD TO SEV CAT FCST FL250/430 STNR NC EGTT SIGMET 1 VALID 140800/141200 EGRB- LONDON FIR/UIR EMBD TS FCST BTN N52 AND N54 E OF E002 TOP FL300 MOV E WKN Which decision is correct?
a) Owing to these reports and taking into account the presence of heavy thunderstorms at planned FL 310 you select a higher flight level (FL 370).
b) Because of the expected turbulence you select a flight level below FL 250.
c) You show no further interest in these reports, since they do not concern the route to be flown.
d) You cancel the flight since the expected dangerous weather conditions along the route would demand too much of the passengers.
8.
In the month of August you prepare a flight (cruising level FL 370) from Bombay (19°N - 73°E) to Bangkok (13°N - 100°E). What wind conditions can you expect?
a) Tailwinds.
b) Strong northerly winds.
c) Headwinds.
d) Light winds diagonal to the route.
9.
What is the most significant difference between an equatorial jet stream and all the other jet streams ?
a) Wind speed.
b) Horizontal dimension.
c) Wind direction.
d) Vertical dimension.
10.
Which of the following types of jet streams can be observed all year round?
a) Arctic jet stream / subtropical jet stream.
b) Subtropical jet stream / polar front jet stream.
c) Equatorial jet stream / polar front jet stream.
d) Equatorial jet stream / arctic jet stream.
11.
Tropical revolving storms do not occur in the southeast Pacific and the south Atlantic because
a) of the low water temperature.
b) there is no coriolis force present.
c) of the strong southeast wind.
d) the southeast trade winds cross over into the northern hemisphere.
12.
Refer to the following TAF extract: BECMG 1821 2000 BR BKN004 BECMG 2124 0500 FG VV001 What visibility is forecast for 2400 UTC?
a) 2000 m.
b) Between 0 m and 1000 m.
c) Between 500 m and 2000 m.
d) 500 m.
13.
Refer to the following TAF extract: BECMG 1821 2000 BR BKN004 BECMG 2124 0500 FG VV001 What does the abbreviation "VV001" mean?
a) RVR less than 100 m.
b) RVR greater than 100 m.
c) Vertical visibility 100 FT.
d) Vertical visibility 100 m.
14.
What is the main energy source of a tropical revolving storm?
a) Latent heat released from condensing water vapour.
b) Temperature difference between equatorial low pressure trough and subtropical high pressure belt.
c) Cold air advancing from temperate latitudes.
d) The equatorial jet stream.
15.
Which of the following meteorological phenomenon indicates upper level instability which may lead to thunderstorm development ?
a) Halo.
b) Red cirrus.
c) AC castellanus.
d) AC lenticularis.
16.
Isolated thunderstorms of a local nature are generally caused by
a) frontal occlusion.
b) frontal lifting (warm front).
c) frontal lifting (cold front).
d) thermal triggering.
17.
Which thunderstorms move forward the fastest?
a) Orographic thunderstorms.
b) Frontal thunderstorms.
c) Thermal thunderstorms.
d) Thunderstorms formed by lifting processes.
18.
What does the term METAR signify?
a) A METAR is a flight forecast, issued by the meteorological station several times daily.
b) A METAR signifies the actual weather report at an aerodrome and is generally issued in half-hourly intervals.
c) A METAR is a warning of dangerous meteorological conditions within a FIR.
d) A METAR is a landing forecast added to the actual weather report as a brief prognostic report.
19.
How long from the time of observation is a TREND in a METAR valid?
a) 2 hours.
b) 30 minutes.
c) 1 hour.
d) 9 hours.
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?
a) Decrease the speed / try to climb above the zone of convective currents if aircraft performance parameters allow.
b) Increase the speed / try to climb above the zone of convective currents if aircraft performance parameters allow.
c) Increase the speed / try to descend below the zone of convective currents.
d) Decrease the speed / try to descend below the zone of convective currents.
21.
At which altitude, at temperate latitudes, may hail be expected in connection with a CB?
a) From the ground up to about FL 200.
b) From the base of the clouds up to about FL 200.
c) From the ground up to a maximum of FL 450.
d) From the ground up to about FL 100.
22.
What is a downburst?
a) An extremely strong wind gust in a tropical revolving storm.
b) A small low pressure system where the wind circulates with very high speeds.
c) A concentrated downdraft with high speeds and a higher temperature than the surrounding air.
d) A concentrated downdraft with high speeds and a lower temperature than the surrounding air.
23.
What is a SPECI?
a) An aerodrome forecast issued every 9 hours.
b) A routine aerodrome weather report issued every 3 hours.
c) A warning of meteorological dangers at an aerodrome, issued only when required.
d) A special aerodrome weather report, issued when a significant change of the weather conditions have been observed.
24.
Refer to the following TAF extract: BECMG 1821 2000 BR BKN004 BECMG 2124 0500 FG VV001 What does the "BECMG" data indicate for the 18 to 21 hour time frame?
a) Many long term changes in the original weather.
b) Many short term changes in the original weather.
c) A quick change to new conditions between 1800 and 1900 UTC.
d) The new conditions are achieved between 1800 and 2100 UTC
25.
Refer to the following TAF extract: BECMG 1821 2000 BR BKN004 BECMG 2124 0500 FG VV001 What does the abbreviation "BKN004" mean?
a) 4 - 8 oktas, ceiling 400 m.
b) 1 - 4 oktas, ceiling 400 FT.
c) 5 - 7 oktas, ceiling 400 FT.
d) 1 - 4 oktas, ceiling 400 m.
26.
Refer to the following TAF extract; BECMG 1821 2000 BR BKN004 PROB30 TEMPO 2124 0500 FG VV001 What does the abbreviation "PROB30" mean?
a) Conditions will last for at least 30 minutes.
b) Change expected in less than 30 minutes.
c) Probability of 30%.
d) The cloud ceiling should lift to 3000 FT.
27.
Where, as a general rule, is the core of the polar front jet stream to be found?
a) In the tropical air mass.
b) Just above the warm-air tropopause.
c) In the polar air mass.
d) Just below the cold-air tropopause.
28.
How long does a typical microburst last?
a) 1 to 5 minutes.
b) 1 to 2 hours.
c) About 30 minutes.
d) Less than 1 minute.
29.
You cross a jet stream in horizontal flight at approximately right angles. While crossing, in spite of a strong wind of 120 kt, you notice the temperature barely changes. Which of the following statements is correct ?
a) This phenomenon does not surprise you at all, since normally no large temperature differences are possible at these heights.
b) Since the result of such readings seems impossible, you will have the instruments tested after landing.
c) You assume the front associated with the jet stream to be very weak with practically no temperature difference between the two air masses.
d) This phenomenon is absolutely normal as you are crossing the jet core.
30.
The Hurricane season is mainly from
a) April until July.
b) July until November.
c) January until April.
d) October until January.
31.
In which month does the humid monsoon in India start?
a) In March.
b) In October.
c) In December.
d) In June.
32.
At about what geographical latitude as average is assumed for the zone of prevailing westerlies?
a) 10°N.
b) 80°N.
c) 30°N.
d) 50°N.
33.
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?
a) The wind components correspond to the seasonal change of the regional wind system.
b) The flights happen to be in the area of the polar front jet stream.
c) The flights in January encountered, by chance, very unusual, adverse wind conditions.
d) The flights during the summer encountered, by chance, very unusual, favourable conditions.
34.
What jet streams are likely to be crossed during a flight from Stockholm to Rio de Janeiro (23°S) at FL 350 in July ?
a) One subtropical jet stream.
b) A subtropical jet stream followed by a polar front jet stream.
c) A polar front jet stream followed by a subtropical jet stream and later, a second polar front jet stream.
d) A polar front jet stream followed by one or two subtropical jet streams.
35.
While crossing a jet stream at right angles in Western Europe (3000 FT below its core) and OAT is decreasing, what would be the prevailing wind?
a) Crosswind from the left
b) A headwind.
c) Crosswind from the right
d) A tailwind.
36.
What is normally the most effective measure to reduce or avoid CAT effects?
a) Change of flight level.
b) Change of course.
c) Decrease of speed.
d) Increase of speed.
37.
Which area of a polar front jet stream in the northern hemisphere has the highest probability of turbulence?
a) Looking downstream, the area to the right of the core.
b) Looking downstream, the area to the left of the core.
c) Above the core in the boundary between warm and cold air.
d) In the core of the jet stream.
38.
Atmospheric soundings give the following temperature profile: 3000 FT +15°C 6000 FT +8°C 10000 FT +1°C 14000 FT -6°C 18000 FT -14°C 24000 FT -26°C At which of the following flight levels is the risk for aircraft icing, in cloud, greatest?
a) FL 150
b) FL 220
c) FL 180
d) FL 80
39.
On the approach, the surface temperature is given as -5°C. The freezing level is at 3000 FT/AGL. At 4000 FT/AGL, there is a solid cloud layer from which rain is falling. According to the weather briefing, the clouds are due to an inversion caused by warm air sliding up and over an inclined front. Would you expect icing?
a) No, absolutely no icing will occur.
b) Yes, between ground level and 3000 FT/AGL.
c) No, flights clear of cloud experience no icing.
d) Yes, but only between 3000 and 4000 FT/AGL.
40.
In an air mass with no clouds the surface temperature is 15°C and the temperature at 1000 m/AGL is 13°C. This layer of air is:
a) conditionally unstable
b) unstable
c) a layer of heavy turbulence
d) stable
41.
Half the mass of the atmosphere is found in the first
a) 8 km
b) 3 km
c) 5 km
d) 11 km
42.
The thickness of the troposphere varies with
a) longitude
b) the wind
c) latitude
d) rotation of the earth
43.
In the lower part of the stratosphere the temperature
a) is almost constant
b) decreases with altitude
c) increases at first and decreases afterward
d) increases with altitude
44.
How are the air masses distributed in a cold occlusion ?
a) The coldest air mass behind and the less cold air in front of the occlusion; the warm air mass is above ground level.
b) The coldest air in front of and the warm air behind the occlusion; the less cold air is above ground level.
c) The coldest air behind and the warm air in front of the occlusion; the less cold air mass is above ground level.
d) The coldest air in front of and the less cold air is behind the occlusion; the warm air mass is above ground level.
45.
If a saturated air mass descends down a slope its temperature increases at
a) a higher rate than in dry air, as it gives up latent evaporation heat.
b) a lower rate than in dry air, as condensation gives out heat.
c) a lower rate than in dry air, as evaporation absorbs heat.
d) the same rate as if the air mass were dry.
46.
What characterizes a stationary front ?
a) The weather conditions that it originates is a combination between those of an intense cold front and those of a warm and very active front
b) The surface wind usually has its direction perpendicular to the front
c) The warm air moves at approximately half the speed of the cold air
d) The surface wind usually has its direction parallel to the front
47.
The most likely reason for radiation fog to dissipate or become low stratus is:
a) an increasingly stable atmosphere.
b) surface cooling.
c) a low level temperature inversion.
d) increasing surface wind speed.
48.
The geostrophic wind is greater than the gradient wind around a low pressure system because the
a) centrifugal force opposes the pressure gradient
b) coriolis force is added to the pressure gradient
c) centrifugal force is added to the pressure gradient
d) coriolis force opposes to the centrifugal force
49.
The geostrophic wind is less than the gradient wind around an anticyclone because the
a) coriolis effect opposes the centrifugal force
b) centrifugal force opposes the pressure gradient
c) centrifugal force is added to the pressure gradient
d) effect of coriolis is added to friction
50.
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 ?
a) From the right and slightly on the tail
b) From the left and slightly on the tail
c) From the right and slightly on the nose
d) From the left and slightly on the nose
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