Avit 323 Block 10 Exam Questions and
Answers 100% Pass
In one sentence, define induced drag and be very specific - ✔✔The aft-acting
component of lift
What is parasite drag? - ✔✔Any drag that is not caused by the production of lift
What is the boundary layer? - ✔✔Layer of air over the surface which shows local
retardation due to viscosity
What are the 3 sections in the boundary layer? - ✔✔Laminar, Transition and Turbulent
Explain sphere of influence - ✔✔High aspect ratio changes the airflow minimally
See circles
What happens to induced drag as aspect ratio goes up? - ✔✔Induced drag is decreased
(less down-wash) the longer the wing the easier the aircraft has to work to produce lift
What happens to induced drag as weight goes up? - ✔✔Increases induced drag
What happens to induced drag as speed goes up? - ✔✔Induced drag goes down
What happens to induced drag as altitude goes up? - ✔✔Induced drag increases
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, What happens to induced drag as lift increases? - ✔✔Induced drag increases
Why are wingtip vortices included in induced drag? - ✔✔They are induced drag
because they are formed due to the production of lift.
Define viscosity - ✔✔Resistance to shear
What is viscous drag? - ✔✔Skin Friction drag which is the interaction of laminer flow
and the surface of the aircraft
What happens to the boundary layer when it separates during the adverse pressure
gradient? 3 things - ✔✔1. Flow will ALWAYS slow along the adverse pressure gradient.
2. If its slow enough it reverses direction. Once reversed, boundary layer separates from
surface.
3. Once formed, separation bubble is extreme low pressure so it causes burbling.
Name the type of drag that increases as the boundary layer separates aft of the center of
lift? - ✔✔Pressure drag or Friction
What causes parasite drag? (4 things) - ✔✔Powerplant cooling
Air conditioning
Leakage through access gaps
Poor construction
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Answers 100% Pass
In one sentence, define induced drag and be very specific - ✔✔The aft-acting
component of lift
What is parasite drag? - ✔✔Any drag that is not caused by the production of lift
What is the boundary layer? - ✔✔Layer of air over the surface which shows local
retardation due to viscosity
What are the 3 sections in the boundary layer? - ✔✔Laminar, Transition and Turbulent
Explain sphere of influence - ✔✔High aspect ratio changes the airflow minimally
See circles
What happens to induced drag as aspect ratio goes up? - ✔✔Induced drag is decreased
(less down-wash) the longer the wing the easier the aircraft has to work to produce lift
What happens to induced drag as weight goes up? - ✔✔Increases induced drag
What happens to induced drag as speed goes up? - ✔✔Induced drag goes down
What happens to induced drag as altitude goes up? - ✔✔Induced drag increases
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, What happens to induced drag as lift increases? - ✔✔Induced drag increases
Why are wingtip vortices included in induced drag? - ✔✔They are induced drag
because they are formed due to the production of lift.
Define viscosity - ✔✔Resistance to shear
What is viscous drag? - ✔✔Skin Friction drag which is the interaction of laminer flow
and the surface of the aircraft
What happens to the boundary layer when it separates during the adverse pressure
gradient? 3 things - ✔✔1. Flow will ALWAYS slow along the adverse pressure gradient.
2. If its slow enough it reverses direction. Once reversed, boundary layer separates from
surface.
3. Once formed, separation bubble is extreme low pressure so it causes burbling.
Name the type of drag that increases as the boundary layer separates aft of the center of
lift? - ✔✔Pressure drag or Friction
What causes parasite drag? (4 things) - ✔✔Powerplant cooling
Air conditioning
Leakage through access gaps
Poor construction
Brittie Donald, All Rights Reserved © 2025 2
