# Aerodynamic Principles Of Flight: Trivia Facts Quiz

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Welcome to the trivia quiz that will test you on Aerodynamic Principles of Flight. It is drawn from Aerodynamic Principles Section A Four Forces of flight. Do you think that you had a proper understanding of the course to tackle it? Do give it a try and get to see what parts of it you have already forgotten. All the best!

• 1.

### The four forces acting on an airplane in flight are

• A.

Lift, weight, thrust, and drag

• B.

Lift, weight, gravity, and thrust

• C.

Lift, gravity, power, and friction.

A. Lift, weight, thrust, and drag
Explanation
The correct answer is lift, weight, thrust, and drag. These four forces are essential for an airplane to maintain flight. Lift is the force that opposes gravity and allows the airplane to stay airborne. Weight is the force exerted by gravity on the airplane, pulling it downwards. Thrust is the force generated by the engines that propels the airplane forward. Drag is the resistance encountered by the airplane as it moves through the air. Together, these four forces work in balance to keep the airplane flying.

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• 2.

### When are the four forces that act on an airplane in equilibrium?

• A.

During unaccelerated flight.

• B.

When the aircraft is accelerating.

• C.

When the aircraft is at rest on the ground.

A. During unaccelerated flight.
Explanation
The four forces that act on an airplane are lift, weight, thrust, and drag. In order for these forces to be in equilibrium, the airplane must be in unaccelerated flight. This means that there is no change in speed or direction, and the net force acting on the airplane is zero. During unaccelerated flight, the lift force is equal to the weight force, and the thrust force is equal to the drag force, resulting in a balanced state where the airplane maintains a steady level of flight.

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• 3.

### (Refer to figure 1.) The acute angle A is the angle of

• A.

Incidence

• B.

Attack

• C.

Dihedral

B. Attack
Explanation
In the given figure, angle A is labeled as the "attack" angle. The term "attack" refers to the angle at which an object or surface is oriented relative to the direction of motion or airflow. In this context, it likely refers to the angle at which an object is positioned to maximize its efficiency or effectiveness in a particular situation. Without further context, it is difficult to determine the specific meaning of the term "attack" in this scenario.

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• 4.

### The term "angle of attack" is defined as the angle

• A.

Between the wing chord line and the relative wind

• B.

Between the airplane's climb angle and the horizon

• C.

Formed by the longitudinal axis of the airplane and the chord line of the wing.

A. Between the wing chord line and the relative wind
Explanation
The correct answer is between the wing chord line and the relative wind. The angle of attack refers to the angle at which the wing is positioned relative to the oncoming airflow or relative wind. It is the angle between the chord line of the wing (an imaginary line running from the leading edge to the trailing edge of the wing) and the direction of the relative wind. This angle is crucial in determining the lift and drag forces acting on the wing, and it plays a significant role in the aerodynamic performance of an aircraft.

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• 5.

### What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

• A.

Lift, equals weight and thrust equals drag

• B.

Lift, drag, and weight equal drag.

• C.

Lift and weight equal thrust and drag.

A. Lift, equals weight and thrust equals drag
Explanation
In straight-and-level flight, the forces acting on an airplane are balanced. Lift, which is the force that opposes weight, is equal to weight, meaning that the airplane is neither climbing nor descending. Thrust, which is the force that opposes drag, is equal to drag, meaning that the airplane is maintaining a constant speed. This balance of forces allows the airplane to maintain its altitude and speed without any changes.

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• 6.

### One of the main function of flaps during approach and landing is to:

• A.

Decrease the angle of descent without increasing the airspeed.

• B.

Permit a touchdown at a higher indicated airspeed

• C.

Increase teh angle of descent without increasing the airspeed.

C. Increase teh angle of descent without increasing the airspeed.
Explanation
Flaps are used during approach and landing to increase the angle of descent without increasing the airspeed. By extending the flaps, the lift produced by the wings is increased, allowing the aircraft to maintain a steeper descent path while keeping the airspeed constant. This is beneficial in situations where a steep descent is required, such as when landing on a short runway or in poor weather conditions. Increasing the angle of descent without increasing the airspeed allows for a controlled and safe landing.

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• 7.

### What is the purpose of wing flaps?

• A.

To enabe the pilot to make steeper approaches to a landing without increasing the airspeed.

• B.

To relieve the pilot of maintaining continuous pressure on the controls.

• C.

To decrease wing area to vary the lift.

A. To enabe the pilot to make steeper approaches to a landing without increasing the airspeed.
Explanation
Wing flaps are used to enable the pilot to make steeper approaches to a landing without increasing the airspeed. By extending the flaps, the effective camber of the wing increases, creating more lift at lower speeds. This allows the aircraft to maintain a higher angle of descent without gaining excessive airspeed, making it easier for the pilot to execute a steeper landing approach.

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• 8.

### The angle of attack at which an airplane wing stalls will

• A.

Increase if the CG is moved forward

• B.

Change with an increase in gross weight

• C.

Remain the same regardless of gross weight.

C. Remain the same regardless of gross weight.
Explanation
The angle of attack at which an airplane wing stalls refers to the point at which the airflow over the wing becomes disrupted and lift is greatly reduced. This angle is primarily determined by the shape and design of the wing, rather than the gross weight or the position of the center of gravity (CG). While a change in CG position can affect the overall stability and handling of the aircraft, it does not directly impact the angle of attack at which the wing stalls. Therefore, regardless of the gross weight or CG position, the angle of attack at which the wing stalls will remain the same.

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• 9.

### What is the ground effect?

• A.

The result of the interference of the surface of the Earth with the airflow patterns about an airplane.

• B.

The result of an alteration in airflow patterns increasing induced drag about the wings of an airplane.

• C.

The result of the disruption of the airflow patterns about the wings of an airplane to the point where the wings will no longer support the airplane in flight.

A. The result of the interference of the surface of the Earth with the airflow patterns about an airplane.
Explanation
The ground effect refers to the phenomenon where the surface of the Earth interferes with the airflow patterns around an airplane. This interference causes a reduction in induced drag, which in turn increases lift and improves the aircraft's performance. The ground effect is most noticeable when the aircraft is flying close to the ground, typically within one wingspan or less. In this situation, the airflow is compressed between the wings and the ground, resulting in a cushion of air that enhances lift and stability.

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• 10.

### Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at:

• A.

Less than the length of the wingspan above the surface.

• B.

Twice the length of the wingspan above the surface.

• C.

A higher-than-normal angle of attack.

A. Less than the length of the wingspan above the surface.
Explanation
During an approach to land, the phenomenon of ground effect causes an increase in lift and a decrease in drag, resulting in a reduction in the amount of power required to maintain level flight. This reduction in power can cause the aircraft to "float" or stay airborne longer than expected. The effect is most pronounced when the aircraft is flying at a height less than the length of the wingspan above the surface. At this height, the ground effect is maximized, and the aircraft may require additional control inputs to ensure a smooth landing.

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• 11.

### What must a pilot be aware of as a result of ground effect?

• A.

Wingtip vortices increase creating wake turbulence problems for arriving and departing aircraft

• B.

Induced drag decreases: therefore, any excess speed at teh point of flare may cause considerable floating

• C.

A full stall landing will require less up elevator deflection than would a full stall when done free of ground effect.

B. Induced drag decreases: therefore, any excess speed at teh point of flare may cause considerable floating
Explanation
Ground effect refers to the phenomenon where the airflow around the wings of an aircraft is affected when it is close to the ground. As a result of ground effect, induced drag decreases. This means that the aircraft requires less power to maintain lift, allowing it to fly at a lower airspeed. However, this reduction in induced drag also means that any excess speed during the flare (the final stage of landing) can cause the aircraft to float, making it difficult for the pilot to make a smooth touchdown. Therefore, a pilot must be aware of the potential for floating and adjust their speed accordingly to ensure a safe landing.

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• 12.

### Ground effect is most likely to result in which problem?

• A.

Settling to the surface abruptly during landing

• B.

Becoming airborne before reaching recommended takeoff speed.

• C.

Inability to get airborne even though airspeed is sufficient for normal takeoff needs.

B. Becoming airborne before reaching recommended takeoff speed.
Explanation
Ground effect is a phenomenon that occurs when an aircraft is flying close to the ground. It causes an increase in lift and a decrease in drag, which can result in the aircraft becoming airborne before reaching the recommended takeoff speed. This can be a problem because the aircraft may not have enough speed to maintain a safe and stable climb after takeoff. It could lead to a loss of control or an inability to clear obstacles, posing a risk to the aircraft and its occupants.

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• 13.

### Which statement relates to Bernoulli's principle?

• A.

For every action there is an equal and opposite reaction

• B.

An additional upward force is generated as the lower surface of the wing deflects air downwards.

• C.

Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.

C. Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
Explanation
Bernoulli's principle states that as the speed of a fluid (in this case, air) increases, its pressure decreases. In the context of an airfoil (wing), the air traveling faster over the curved upper surface creates a lower pressure on the top surface. This pressure difference between the top and bottom surfaces creates lift, allowing an airplane to fly.

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• 14.

### The angle between the chord line of an airfoil and the relative wind is known as the angle of

• A.

Lift

• B.

Attack

• C.

Incidence

B. Attack
Explanation
The angle between the chord line of an airfoil and the relative wind is known as the angle of attack. This angle determines the lift and drag forces acting on the airfoil. A higher angle of attack increases the lift but also increases the drag. The angle of attack is an important parameter in aerodynamics as it affects the performance and stability of an aircraft.

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• 15.

### Changes in the center of pressure of a wing affect the aircraft's

• A.

Lift/drag ratio

• B.

Lifting capacity

• C.

Aerodynamic balance and controllability

C. Aerodynamic balance and controllability
Explanation
Changes in the center of pressure of a wing affect the aircraft's aerodynamic balance and controllability. The center of pressure is the point on the wing where the lift force is considered to act. When the center of pressure moves, it can affect the distribution of lift and drag forces on the wing, which in turn affects the aircraft's balance. If the center of pressure moves too far forward or backward, it can cause the aircraft to become unstable and difficult to control. Therefore, maintaining a stable center of pressure is crucial for maintaining proper aerodynamic balance and controllability.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Jan 10, 2010
Quiz Created by
Jwmann

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