Avit 323 Exam 1 UPDATED Exam Questions
and CORRECT Answers
Mass Flow Theory - CORRECT ANSWER - Constant mass through a smaller area =
velocity increase
Why does static pressure decrease as fluid flows through the venturi? - CORRECT
ANSWER - The airflow has no energy added/subtracted, so the total energy (KE+PE)
must be constant. Therefore, if KE increases due to constriction, PE must decrease to maintain
the constant total energy
Newton's first law - CORRECT ANSWER - Object at rest will remain at rest unless a
force acts upon it
Newton's second law - CORRECT ANSWER - Force = mass x acceleration
Newton's third law - CORRECT ANSWER - For every action, there's an equal and
opposite reaction
Where does lift act out of? - CORRECT ANSWER - Center of Pressure
Why are all forces in equilibrium at a constant TAS climb? - CORRECT ANSWER -
Because there is no acceleration
Why is a loop flown at a constant airspeed and G not symmetrical? - CORRECT
ANSWER - the 1g from level flight is used to make the turn when the airplane is inverted.
The loop will have a tighter radius at the top
Lift equation - CORRECT ANSWER - Lift = 1/2 x density x velocity^2 x CL x sfc area
, Characteristic of air that causes the boundary layer - CORRECT ANSWER - Air viscosity;
higher viscosity = more friction, lower viscosity = less friction
Temperature's effect on air viscosity - CORRECT ANSWER - Cold = less viscosity =
lower friction
Kinematic viscosity - CORRECT ANSWER - Coefficient of absolute viscosity / density
Laminar flow - CORRECT ANSWER - Thinner boundary layer
Lower velocities near the surface and increases slowly
When does laminar flow become turbulent? - CORRECT ANSWER - Surface friction
dissipates the energy of the airstream and the boundary layer thickens
What transfers heat more easily, laminar or turbulent flow? - CORRECT ANSWER -
Turbulent
Why does golfball have dimples? - CORRECT ANSWER - To create turbulent flow to
reduce pressure drag
Do you want turbulent or laminar flow at lower speeds? - CORRECT ANSWER -
Turbulent flow because laminar flow has the tendency to separate at the airfoil
Reynolds number - CORRECT ANSWER - (Velocity x distance back) / kv
Low RN vs High RN - CORRECT ANSWER - Low RN = laminar flow; high RN =
turbulent flow
What would excessive camber do to the airflow? - CORRECT ANSWER - Excessive
camber = increased air velocity = RN increase = break away the boundary layer
and CORRECT Answers
Mass Flow Theory - CORRECT ANSWER - Constant mass through a smaller area =
velocity increase
Why does static pressure decrease as fluid flows through the venturi? - CORRECT
ANSWER - The airflow has no energy added/subtracted, so the total energy (KE+PE)
must be constant. Therefore, if KE increases due to constriction, PE must decrease to maintain
the constant total energy
Newton's first law - CORRECT ANSWER - Object at rest will remain at rest unless a
force acts upon it
Newton's second law - CORRECT ANSWER - Force = mass x acceleration
Newton's third law - CORRECT ANSWER - For every action, there's an equal and
opposite reaction
Where does lift act out of? - CORRECT ANSWER - Center of Pressure
Why are all forces in equilibrium at a constant TAS climb? - CORRECT ANSWER -
Because there is no acceleration
Why is a loop flown at a constant airspeed and G not symmetrical? - CORRECT
ANSWER - the 1g from level flight is used to make the turn when the airplane is inverted.
The loop will have a tighter radius at the top
Lift equation - CORRECT ANSWER - Lift = 1/2 x density x velocity^2 x CL x sfc area
, Characteristic of air that causes the boundary layer - CORRECT ANSWER - Air viscosity;
higher viscosity = more friction, lower viscosity = less friction
Temperature's effect on air viscosity - CORRECT ANSWER - Cold = less viscosity =
lower friction
Kinematic viscosity - CORRECT ANSWER - Coefficient of absolute viscosity / density
Laminar flow - CORRECT ANSWER - Thinner boundary layer
Lower velocities near the surface and increases slowly
When does laminar flow become turbulent? - CORRECT ANSWER - Surface friction
dissipates the energy of the airstream and the boundary layer thickens
What transfers heat more easily, laminar or turbulent flow? - CORRECT ANSWER -
Turbulent
Why does golfball have dimples? - CORRECT ANSWER - To create turbulent flow to
reduce pressure drag
Do you want turbulent or laminar flow at lower speeds? - CORRECT ANSWER -
Turbulent flow because laminar flow has the tendency to separate at the airfoil
Reynolds number - CORRECT ANSWER - (Velocity x distance back) / kv
Low RN vs High RN - CORRECT ANSWER - Low RN = laminar flow; high RN =
turbulent flow
What would excessive camber do to the airflow? - CORRECT ANSWER - Excessive
camber = increased air velocity = RN increase = break away the boundary layer
