AVIT 323 Final Exam UPDATED Exam Questions and CORRECT Answers

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AVIT 323 Final Exam UPDATED Exam Questions and CORRECT Answers

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AVIT 323 Final Exam UPDATED Exam
Questions and CORRECT Answers
What is the boundary layer? - CORRECT ANSWER - Layer of airflow over the surface
that shows local retardation due to viscosity.

What is viscosity? - CORRECT ANSWER - Resistance to shear

True or False: Turbulent air transfers heat better - CORRECT ANSWER - True

True or False: Turbulent air holds a lot of kinetic energy - CORRECT ANSWER - False

What are the sections of the boundary layer? - CORRECT ANSWER - Laminar, transition,
turbulent

What happens during the adverse pressure gradient? - CORRECT ANSWER - Flows
slows down to a point of reversing, once it reverses, the boundary layer separates from the
surface. Creating a separation bubble.

What are the two types of turbulent flow? - CORRECT ANSWER - Burbling
Vortex Tubes

What causes pressure drag? - CORRECT ANSWER - Separation

What kind of drag dominates on non-streamlined aircraft? - CORRECT ANSWER -
Pressure drag

What kind of drag dominates on streamlined aircraft? - CORRECT ANSWER - Skin-
friction drag

, What are the types of parasite drag? - CORRECT ANSWER - Form/pressure
Skin friction
Profile
Interference
Cooling
Leakage

What causes parasite drag? - CORRECT ANSWER - Any loss in momentum due to:
Powerplant cooling
Air conditioning
Leakage through access gaps
Poor construction

What is skin friction drag? - CORRECT ANSWER - Viscous drag over the boundary layer

What is the perfect fineness ratio? - CORRECT ANSWER - 4:1

What is form/pressure drag? - CORRECT ANSWER - Caused by pressure differences of
the forward and aft surfaces.

Laminar flow separates easily

Turbulent flow stays attached better

Streamlining helps boundary layer stay attached better

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Uploaded on: February 26, 2025
Number of pages: 15
Written in: 2024/2025
Type: Exam (elaborations)
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