ATSC 231 Block 4 Exam Questions with All Correct Answers
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Course
ATSC 231
Institution
ATSC 231
ATSC 231 Block 4 Exam Questions with All Correct Answers
Which of the following factors does not affect the collection efficiency of water droplets by an aircraft structure? - Answer- temperature
How does the collection efficiency of water droplets on an aircraft structure change with the ge...
ATSC 231 Block 4 Exam Questions
with All Correct Answers
Which of the following factors does not affect the collection efficiency of water droplets
by an aircraft structure? - Answer- temperature
How does the collection efficiency of water droplets on an aircraft structure change with
the geometry of the collecting surface? - Answer- The collection efficiency decreases for
more curved surfaces
What temperature range does rime ice occur (assuming average liquid water content)? -
Answer- colder than -15C
How does the expected ice type (glaze) change with liquid water content? - Answer-
glaze (or clear) ice can be expected at colder temperatures with high liquid water
contents
Ice particles tend to bounce off an aircraft surface when they strike - Answer- true
Which of the following factors does not affect the thermodynamics of freezing of water
droplets on an aircraft structure? - Answer- geometry of the collecting surface
Which of the following is not conducive to the formation of rime ice? - Answer- large
amounts of liquid water
At temperatures below ____ most clouds are made up entirely of ice particles - Answer-
-20C
Conditions for the formation of structural icing on aircraft are not present in the summer.
- Answer- False
Icing regions caused by warm fronts tend to cover large areas and are slow moving. -
Answer- True
Which factor does not determine the liquid water content of a cloud? - Answer- width of
cloud
What icing rate of accretion is most probable in towering cumulus clouds? - Answer-
severe
Clouds colder than _____ are composed of mostly ice crystals. - Answer- -20C
, Which state in the US has the highest frequency of freezing rain and freezing drizzle? -
Answer- Texas
What are the two required conditions for clouds with significant amounts of supercooled
liquid water? - Answer- lifting mechanism and a source of atmosphere
Which cloud would have the highest liquid water content. - Answer- a cloud with a warm
cloud base temperature
Freezing drizzle always indicates warmer air aloft - Answer- False
The regions of icing associated with cold fronts are not as widespread as that of warm
fronts. - Answer- True
Aircraft that are certified for flight into known icing conditions have systems that keep
the windscreen (or portions thereof) clear of ice. - Answer- True
What type of system is bleed-air - Answer- anti-icing
What is an airplane's response to a tailplane stall? - Answer- a rapid pitching down
motion
Modern pneumatic deicing boots are susceptible to ice bridging. - Answer- False
An indication of propeller icing for an airplane equipped with constant speed (variable
pitch) propellers is a reduction of RPM. - Answer- False
When should pitot heat be activated (in relation to icing conditions)? - Answer- Before
icing is encountered
Ice accretion on an airplane's horizontal stabilizer can result in - Answer- tailplane stall
Which of the following is an indication that the ice accretion on an airplane in flight is a
result of supercooled large drops (SLDs)? - Answer- ice aft of protected areas
How does an increase in the angle attack of an airfoil change its collection efficiency? -
Answer- it increases the collection efficiency
The outboard portion and tips of an airplane's wing have a higher collection efficiency
than the wing root. - Answer- True
Where does the flight crew obtain information to determine the start of the hold over
time? - Answer- from the ground crew that applied the fluid
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