ATSC 113 Midterm 1 Exam Questions with All Correct Answers Already Tested
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Module
ATSC 113
Institution
ATSC 113
ATSC 113 Midterm 1 Exam Questions with All Correct Answers Already Tested
What are supercooled droplets? - Answer- Can be liquid between -40C and 0C but the liquid droplets freeze almost instantly when they touch something soild and cold
What happens to precipitation when you climb above -40...
ATSC 113 Midterm 1 Exam Questions
with All Correct Answers Already
Tested
What are supercooled droplets? - Answer- Can be liquid between -40C and 0C but the
liquid droplets freeze almost instantly when they touch something soild and cold
What happens to precipitation when you climb above -40C? - Answer- All liquid water is
already frozen into ice crystals, so there is not normally an icing hazard at these
altitudes because they don't stick to the plane
In the summer where is the highest risk of icing hazard? - Answer- At the top half of the
thunderstorm and other convective clouds
What are ice on aircraft hazards? - Answer- - distrubs airflow along wings, increases
drag
- adds weight
- blocks sight
- ice may form on hte turbine blades, reducing thrust
- ice may choke the engine
When does frost form on aircrafts flying? - Answer- This occurs when an aircraft
descends into warmer humid air and frost my form on the aircraft even in non-cloudy
skies
Are there ice hazards when temperature is below -40C? - Answer- Yes. No ice will form
on the plane but icy ice crystals in the clouds may melt when in the turbine and refreeze
on the turbine blades causing engine troubles
What are the three main types of ice that forms when supercooled water freezes? -
Answer- - Clear Ice
- Rime Ice
- Mixed Ice
What are the characteristics of Clear Ice? - Answer- - large raindrops take a second or
more to freeze
- usually 0C to -5C
- "slow" freezing allows any trapped air bubbles to escape
- ice is very hard
, - difficult to remove
What are the characteristics of Rime Ice? - Answer- - smaller cloud droplets freeze
instantly upon hitting the leading edge
- usually -15C to -20C
- has trapped air pockets
- brittle ice that is easy to break off
What are the characteristics of Mixed Ice? - Answer- - layers/mixture of clear and rime
ice
- more frequent in -5C to -15C
When does frost form on aircrafts? - Answer- When water vapor (not liquid water)
deposits on the aircraft, foming a fuzz of small ice crystals
What are the two ways piolets deal with ice on aircrafts? - Answer- - De-icing: removes
ice that has formed
- Anti-icing: prevents ice from forming
What is ICI? - Answer- Ice Crystal Icing: occurs when an aircraft flys through an ice-
crystal cloud that melts the crystals near the engine, then refreezes on the turbines and
may cause engine failure
What is a front? - Answer- The boundary between warmer and cooler air
What is a warm front? - Answer- Occurs when the cold air retreats
- stratiform clouds are often found ahead hear
What is a cold front? - Answer- Occurs when the cold air advances
- cumuliform clouds are often found at the end here
What is a stationary front? - Answer- Occurs if the boundary between fronts doesn't
move much
What is an occluded front? - Answer- Occurs if the cold front catches up to and merges
with the warm front
- could be either cold or warm
What is Frontogenesis? Frontolysis? - Answer- The birth/creation of a new front vs the
death of an old front
What is a Cold Occlusion? - Answer- Occurs when the approaching air is colder
What is a Warm Occlusion? - Answer- Occurs when the approaching air is cold but
warmer then other front
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