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Question Bank
Questions for ICING
Answer the following questions
Test Mode
Training Mode
1. In which of these cloud types can icing be virtually ruled out?
NS
CI
CU
SC
2. How does freezing rain develop?
Rain falls through a layer where temperatures are below 0°C
Through melting of ice crystals
Through melting of sleet grains
Rain falls on cold ground and then freezes
3. Freezing rain occurs when
ice pellets melt
snow falls into an above-freezing layer of air
rain falls into a layer of air with temperatures below 0°C
water vapour first turns into water droplets
4. Clear ice is dangerous because it
is translucent and only forms at the leading edges
is heavy and is difficult to remove from the aircraft surfaces
is not translucent and forms at the leading edges
spreads out and contains many air particles
5. A vertical temperature profile indicates the possibility of severe icing when the temperature profile
intersects the 0°C isotherm twice
coincides with a dry adiabatic lapse rate
indicates temperatures above 3°C
indicates temperatures below -40°C
6. 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?
Yes, but only between 3000 and 4000 FT/AGL.
No, absolutely no icing will occur
Yes, between ground level and 3000 FT/AGL
No, flights clear of cloud experience no icing
7. In which of these cloud types can icing be virtually ruled out?
SC
AS
CS
NS
8. What type of fronts are most likely to be present during the winter in Central Europe when temperatures close to the ground are below 0°C, and freezing rain starts to fall?
High level cold fronts.
Cold fronts.
Warm fronts, warm occlusions.
Cold occlusions.
9. Under which conditions would you expect the heaviest clear ice accretion to occur in a CB?
Between -20°C and -30°C
Between -2°C and -15°C
Between -30°C and -40°C
Close to the freezing level
10. While descending through a cloud cover at high level, a small amount of a white and rough powder-like contamination is detected along the leading edge of the wing. This contamination is called
Clear ice.
Rime ice.
Mixed ice.
Frost
11. Large supercooled water drops, which freeze on impact on an aircraft, form
rime ice
clear ice
hoar frost
cloudy ice
12. Hoar frost forms on an aircraft as a result of
freezing rain striking the aircraft
droplets forming on the aircraft and then freezing
small super-cooled droplets striking the aircraft
water vapour turning directly into ice crystals on the aircraft surface
13. During the formation of rime ice in flight, water droplets freeze
slowly and spread out
rapidly and spread out
rapidly and do not spread out
slowly and do not spread out
14. The most dangerous form of airframe icing is
clear ice.
dry ice
rime ice
hoar frost
15. Two aircraft, one with a sharp wing profile (S), and the other with a thick profile (T), are flying through the same cloud with same true airspeed. The cloud consists of small supercooled droplets. Which of the following statements is most correct concerning ice accretion?
Aircraft S experiences more icing than T
Aircraft T experiences more icing than S
Neither of the aircraft accumulate ice due to the small size of droplets
Aircraft S and T experience the same amount of icing
16. Glaze or clear ice is formed when supercooled droplets are
small and freeze rapidly
large and at a temperature just below freezing
small and at a temperature just below freezing
of any size at temperatures below -35°C
17. Supercooled droplets are always
small and at a temperature below freezing
at a temperature below -60°C
large and at a temperature below freezing
at a temperature below freezing
18. In which of the following situations can freezing rain be encountered?
Ahead of a warm front in the winter
Behind a warm front in the summer
Ahead of a cold front in the summer
Ahead of a cold front in the winter
19. Supercooled droplets can be encountered
only in winter above 10000 FT
in winter only in high clouds
only in winter at high altitude
at any time of the year
20. Which of the following conditions is most likely to cause airframe icing?
GR
PE
SHSN
+FZRA
21. Freezing fog exists if fog droplets
are freezing very rapidly
freeze when temperature falls below zero
are frozen
are supercooled
22. At what degree of icing should ICAO’s “Change of course and/or altitude desirable” recommendation be followed?
Severe
Moderate
Light
Extreme
23. In which environment is aircraft structural ice most likely to have the highest rate of accretion?
Freezing rain
Stratus clouds
Snow
Cirrus clouds
24. Which of the following statements is true regarding moderate-to-severe airframe icing?
It is likely to occur in nimbostratus cloud
It always occurs in altostratus cloud
It will occur in clear-sky conditions
It may occur in the uppermost levels of a cumulonimbus capillatus formation
25. You have been flying for some time in dense layered cloud. The outside air temperature is - 25°C. Which of the following statements is true?
If you do not have weather radar on board there is no need to worry as CB is unlikely to form in such cloud
Severe airframe icing is quite likely under these conditions
In a dense layered cloud icing is unlikely
Severe airframe icing is unlikely under these conditions
26. Hoar frost is most likely to form when
flying inside convective clouds.
taking off from an airfield with a significant ground inversion.
flying in supercooled drizzle.
flying inside stratiform clouds.
27. A small supercooled cloud droplet that collides with an airfoil will most likely
freeze immediately and create clear ice
freeze immediately and create rime ice
travel back over the wing, creating rime ice
travel back over the wing, creating clear ice
28. Supercooled droplets can occur in
precipitation but not in clouds
clouds but not in precipitation
clouds, fog and precipitation
clouds but not in fog
29. Freezing precipitation occurs
mainly in the form of freezing rain or freezing drizzle
mainly in the form of freezing hail or freezing snow
only in the precipitation of a warm front
only in the precipitation of a cold front
30. How does a pilot react to heavy freezing rain at 2000 FT/AGL, when he is unable to deice, nor land?
He descends to the warm air layer below
He continues to fly at the same altitude
He ascends to the cold air layer above
He turns back before the aircraft loses maneuverability
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