CIVIL AVIATION AGENCY
of LATVIA
EXAMINATION
050
METEOROLOGY
PPL(A)(H)
Version: 501
Jautājumu skaits - 16
Eksāmena ilgums – 60 minūtes
1
In which of the following situations is an aircraft most susceptible to
icing ?
A)
B)
C)
D)
2
What is the relative movement of the two air masses along a cold front ?
A)
B)
C)
D)
3
B)
C)
D)
unlimited visibility
fog or low cloud
clear and cool
high scattered clouds
The maximum amount of water vapour that the air can contain depends
on the
A)
B)
C)
D)
8
in mid-latitudes only
in summer during the day only
in unstable atmosphere
in stable atmosphere
When the temperature and dew point are less than one degree apart the
weather conditions are most likely to be
A)
B)
C)
D)
7
TS, SH.
CB, TS.
Calm winds, haze.
NS.
Convective clouds are formed
A)
B)
C)
D)
6
Low stratus will develop caused by radiation in combination with low
geostrophic wind speed.
Layers of altocumulus will develop caused by increasing wind speed.
Stratocumulus will develop caused by insolation.
Low stratus will develop caused by increasing wind speed.
In temperate latitudes what weather conditions may be expected over
land during the summer in the centre of a stationary high pressure zone
?
A)
B)
C)
D)
5
Cold air slides over a warm air mass
Warm air pushes under a cold air mass
Cold air pushes under a warm air mass
Warm air pushes over a cold air mass
As a result of diurnal variation radiation fog is lifted and a cloud cover is
formed. Which statement is true?
A)
4
Level flight below a rain-producing cloud when OAT is below zero degrees C.
Level flight in snowfall below a nimbostratus layer.
Flying in heavy drizzle.
Flying in dense cirrus clouds.
dew point
relative humidity
air temperature
stability of the air
Ridges are extensions of
A)
B)
C)
D)
high pressure areas and generally have large amounts of cloud
low pressure areas and generally have small amounts of cloud
high pressure areas and generally have small amounts of cloud
low pressure areas and generally have large amounts of cloud
9
The temperature at FL 160 is -22°C. What will the temperature be at FL 90
if the ICAO standard lapse rate is applied ?
A)
B)
C)
D)
10
What is a trend forecast?
A)
B)
C)
D)
11
-8°C
+4°C
0°C
-4°C
A route forecast valid for 24 hours
A routine report
An aerodrome forecast valid for 9 hours
A landing forecast appended to METAR/SPECI, valid for 2 hours
An aerodrome VOLMET report for 0250 UTC during the autumn in the
Baltics is:
Surface wind 15005kt
Visibility
2000 metres
Weather
Nil
Temperature 9°C
Dewpoint temperature 8°C
QNH
1029mb
Trend
NOSIG
Given that sunrise is at 0400 UTC, during the two hours following the
report, the most probable meteorological condition to develop would be:
A)
B)
C)
D)
12
Unstable air is characterised by:
A)
B)
C)
D)
13
severe turbulence.
thunderstorms.
rain ice decreasing then increasing.
severe icing.
A VOLMET is defined as:
A)
B)
C)
D)
15
cumulus cloud with poor visibility and intermittent drizzle.
layered cloud with continuous light rain and moderate visibility.
cumulus cloud with showers and generally good visibility.
layered cloud with continuous moderate to heavy rain and moderate to poor
visibility.
The symbol below appearing on a forecast weather chart means:
A)
B)
C)
D)
14
CAVOK.
advection fog.
a very low cloud base.
radiation fog.
a radio broadcast of selected aerodrome forecasts.
a continuous telephone message of selected aerodrome METARs.
a continuous radio broadcast of selected aerodrome actual weather
observations and forecasts.
a radio transmission of a requested aerodrome actual weather observation and
forecast.
The wind speed is dependant on
A)
B)
C)
D)
how high the pressure is
the latitude
the temperature of the air mass
the pressure gradient force and geostrophic forc
16
Which of the following is typical for the passage of an active cold front in
the summer?
A)
B)
C)
D)
17
What is the lowest visibility forecast for Bangkok at ETA 1400 UTC ?
TAF VTBD 271800Z 280024 VRB05KT 1200 BR TEMPO 0002 4000 BECMG
0205 9999 SCT015 BKN100 TEMPO 1118 04010G20KT 5000 TSRA
SCT009 BKN014 BKN018CB BECMG 2024 6000=
A)
B)
C)
D)
18
Mainly towering clouds
Mainly layered clouds
Rapid increase in temperature once the front has passed
Rapid drop in pressure once the front has passed
10 km or more
5 km
6 km
1200 metres
Please describe weather conditions on the route EVRA – EFTU
(departure EVRA 1200 UTC):
Pressure system: ____________________________________________________
Frontal system: ____________________________________________________
Visibility: ____________________________________________________
Precipitation: ____________________________________________________
Clouds: ____________________________________________________
___________________________________________________________
Ceiling: ____________________________________________________
Wind: ____________________________________________________
Turbulence: ____________________________________________________
Icing: ____________________________________________________
Freezing level: ____________________________________________________
IMC weather (areas, altitudes):
______________________________________________
_______________________________________________________________________
19
The temperature at 2000ft amsl is forecast to be +5°C: compared to
the International Standard Atmosphere (ISA) this is:
A)
B)
C)
D)
20
ISA -6.
IAS +6.
ISA +5.
ISA -4.
During the life cycle of a thunderstorm, which stage is characterized
predominantly by downdrafts?
A)
B)
C)
D)
Dissipating stage
Mature stage
Tornado stage
Initial stage