China Civil UAV Theory Questions — Questions 929–931
Unofficial study reference only. Not affiliated with or endorsed by any civil aviation authority — the official syllabus and regulations prevail.
UAV-Q0929. When an aircraft's angle of attack decreases, the aircraft's center-of-gravity position will ________.
Explanation
The center of gravity is unchanged: a change in angle of attack does not change the aircraft's mass distribution, so the center-of-gravity position remains unchanged.
UAV-Q0930. An outward-slipping turn occurs because centrifugal force is greater than the horizontal component of lift, pulling the aircraft toward the outside of the turn. Which of the following statements is WRONG?
Explanation
Study note: for centrifugal force, look for centrifugal force. An outward-slipping turn can be corrected by increasing the bank angle to increase the horizontal component of lift to balance centrifugal force, so option A is correct. To maintain a given angular velocity, the bank angle varies with airspeed (ω = v/r), not with centrifugal force, so option B is wrong. High-speed aircraft are sensitive to sideslip, so correcting sideslip is important, so option C is correct.
UAV-Q0931. The main function of a leading-edge slat is to ________.
Explanation
The main function of a leading-edge slat is to increase the aircraft's critical angle of attack. When opened, airflow through the slot replenishes energy on the upper wing surface, delaying airflow separation, so the aircraft does not stall at a larger angle of attack, thereby increasing the critical angle of attack. Option B, increasing lift, is its indirect effect; option C, reducing drag, is not its main function.