Avit 323 Block 10 Exam: Parasite Drag UPDATED Exam Questions and CORRECT Answers

Avit 323 Block 10 Exam: Parasite Drag
UPDATED Exam Questions and CORRECT
Answers
drag definition - CORRECT ANSWER - the component of aerodynamic force that is
parallel to the relative wind and retards the forward motion of the aircraft


drag - CORRECT ANSWER - a result of the interaction and contact of a solid body with a
fluid (liquid or gas)


parasite drag - CORRECT ANSWER - -drag that is NOT associated with the production of
lift
-the result of displacement of air by the aircraft


induced drag - CORRECT ANSWER - the portion of drag which is caused by the
production of lift


shockwave drag - CORRECT ANSWER - result of shockwave formations at high speeds



types of parasite drag - CORRECT ANSWER - -skin friction
-form
-profile
-interference
-cooling
-leakage


skin friction drag - CORRECT ANSWER - -the aerodynamic resistance due to the contact
of moving air with the surface of the aircraft

, -no matter how smooth a surface appears, every surface has rought and ragged surface when
viewed under a microscope


factors that influence skin friction - CORRECT ANSWER - -wetted surface
-amount of viscous drag in the boundry layer
-velocity


wetted area - CORRECT ANSWER - portion of the aircraft that is in direct contact with
the atmosphere


what is the boundary layer? - CORRECT ANSWER - airflow which shows local reduction
in airflow due to viscosity


what are the two types of boundary layers? - CORRECT ANSWER - laminar and turbulent



Laminar boundary layer - CORRECT ANSWER - -low viscous drag
-seperations occurs earlier


turbulent boundary layer - CORRECT ANSWER - -high viscous drag
-seperation occurs later


reducing skin friction - CORRECT ANSWER - -flush mounted rivets
-smooth finish
-remove dirt and keep waxed


form drag definition - CORRECT ANSWER - portion of drag which is generated by the
shape of the aircraft and its components