FAA Ground School Practice Test

The acute angle A refers specifically to which of the following?

1. Flaps extension

2. Attitude of the aircraft

3. Angle of attack

4. Bank angle

The correct answer is: Angle of attack

The acute angle A specifically refers to the angle of attack. The angle of attack is defined as the angle between the chord line of the wing and the relative wind. It is a critical parameter in aerodynamics, as it directly influences lift generation and the stall characteristics of the aircraft. When the angle of attack increases, lift increases up to a certain point, beyond which further increases can lead to a stall. Understanding and managing the angle of attack is crucial for safe and efficient flight. In contrast, flaps extension refers to the deflection of the wing flaps, which alters the airfoil characteristics to increase lift at lower speeds. The attitude of the aircraft describes its orientation in space concerning the horizon, typically represented by pitch, roll, and yaw angles. The bank angle specifically refers to the angle between the vertical and the line of the aircraft in a turn, which is a different concept entirely from the angle of attack. Therefore, the term "acute angle A" is most accurately associated with the angle of attack.