MOD 8.2 PART 1

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Which type of flow is characterized by smooth paths known as streamlines?

Turbulent flow

Relative air flow

Laminar flow (correct)

Cross flow

Which statement best describes the boundary layer?

It is a layer of air adjacent to the aerofoil surface. (correct)

The point where the air breaks away from the surface to cause a turbulent wake.

it is a layer of air that's laminar only.

It is the area where the airflow changes from laminar to turbulent.

What causes the boundary layer to form?

The viscosity of the air sticking to the surface of the wing. (correct)

The turbulence of the air particles.

The cross flow of the air.

The friction and pressure gradient within the boundary layer.

What is the point at which the boundary layer breaks away from the surface to form a turbulent wake called?

Separation point Signup and view all the answers

According to Bernoulli's theorem, what happens to the static pressure of subsonic air when it flows through a wider section of a duct?

The static pressure of the air will increase Signup and view all the answers

At what speeds does the incompressible behavior of fluids theory still hold valid for air?

Below 130-150 m/s Signup and view all the answers

What happens to the velocity when the air flows through a wider section of a duct at speeds at or above the speed of sound?

The velocity and dynamic pressure increase Signup and view all the answers

What happens to the air density when the air is compressed by the rise in pressure in the divergent part of the duct at subsonic speeds ?

The air density increases Signup and view all the answers

What happens to the static pressure and dynamic pressure as the velocity of airflow increases in a diverging duct at supersonic?

The static pressure decreases and the dynamic pressure increases Signup and view all the answers

What is the main cause of skin friction on the surface of an aircraft?

The roughness and viscosity of the air Signup and view all the answers

What happens to the viscosity of air as temperature decreases?

The viscosity increases Signup and view all the answers

Which angle describes the angle formed between the wing and the horizontal plane passing through the root of the wing?

Dihedral Signup and view all the answers

What is the mean aerodynamic chord (MAC)?

The average chord of the wing Signup and view all the answers

What is wash-in?

An increase in angle of incidence near the wing tip Signup and view all the answers

What is the centre of pressure (CoP)?

A point on the chord line through which the total reaction may be considered to act Signup and view all the answers

Which direction does the Relative Airflow (Wind) pass over the aerofoil surface of an aircraft?

In the opposite direction of the aircraft's forward flight path velocity Signup and view all the answers

What causes the formation of wing tip vortices?

The pressure difference between the top and bottom surfaces of the wing Signup and view all the answers

What is the purpose of an aerofoil on an aircraft?

To produce a reaction when moved through an airstream Signup and view all the answers

What is the chord line of an aerofoil?

The line joining the centres of curvatures of the leading and trailing edges Signup and view all the answers

Which one of the following statements about camber is correct?

Upper camber refers to the curvature of the upper surface of the wing. Signup and view all the answers

Which one of the following is true about symmetrical wings?

Symmetrical wings rely on a positive angle of attack to generate lift. Signup and view all the answers

Which one of the following is true about the angle of attack?

The angle of attack is the angle between the chord line of the section and the direction of the oncoming airflow. Signup and view all the answers

Which one of the following is true about the aspect ratio of a wing?

The aspect ratio is the ratio of the wing span to the average chord. Signup and view all the answers

Which of the following is the aeronautical term for the total air resistance experienced by the aircraft as it moves relative to the air?

Total Drag Signup and view all the answers

Which type of drag opposes the motion and acts parallel to and in the same direction as the relative airflow?

Total Drag Signup and view all the answers

Which type of drag is made up of Skin Friction, Form Drag, and Interference Drag?

Profile Drag Signup and view all the answers

What is the term for the layer or layers in which the shearing action takes place between the surface and the point of the flow traveling at the full velocity?

Boundary Layer Signup and view all the answers

Which of the following is true about aerodynamic drag?

It opposes the motion and acts parallel to and in the same direction as the relative airflow. Signup and view all the answers

Which type of drag is the sum total of various drag forces acting on the aircraft?

Total Drag Signup and view all the answers

What are the component parts of Profile Drag?

Skin Friction, Form Drag, and Interference Drag Signup and view all the answers

MOD 8.2 PART 1

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Questions and Answers

Which type of flow is characterized by smooth paths known as streamlines?

Which statement best describes the boundary layer?

What causes the boundary layer to form?

What is the point at which the boundary layer breaks away from the surface to form a turbulent wake called?

According to Bernoulli's theorem, what happens to the static pressure of subsonic air when it flows through a wider section of a duct?

At what speeds does the incompressible behavior of fluids theory still hold valid for air?

What happens to the velocity when the air flows through a wider section of a duct at speeds at or above the speed of sound?

What happens to the air density when the air is compressed by the rise in pressure in the divergent part of the duct at subsonic speeds ?

What happens to the static pressure and dynamic pressure as the velocity of airflow increases in a diverging duct at supersonic?

What is the main cause of skin friction on the surface of an aircraft?

What happens to the viscosity of air as temperature decreases?

Which angle describes the angle formed between the wing and the horizontal plane passing through the root of the wing?

What is the mean aerodynamic chord (MAC)?

What is wash-in?

What is the centre of pressure (CoP)?

Which direction does the Relative Airflow (Wind) pass over the aerofoil surface of an aircraft?

What causes the formation of wing tip vortices?

What is the purpose of an aerofoil on an aircraft?

What is the chord line of an aerofoil?

Which one of the following statements about camber is correct?

Which one of the following is true about symmetrical wings?

Which one of the following is true about the angle of attack?

Which one of the following is true about the aspect ratio of a wing?

Which of the following is the aeronautical term for the total air resistance experienced by the aircraft as it moves relative to the air?

Which type of drag opposes the motion and acts parallel to and in the same direction as the relative airflow?

Which type of drag is made up of Skin Friction, Form Drag, and Interference Drag?

What is the term for the layer or layers in which the shearing action takes place between the surface and the point of the flow traveling at the full velocity?

Which of the following is true about aerodynamic drag?

Which type of drag is the sum total of various drag forces acting on the aircraft?

What are the component parts of Profile Drag?

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