China Civil UAV Theory Questions — Questions 471–480

UAV-Q0471. The runway used for aircraft takeoff and landing mainly depends on ________.

Explanation

A tailwind landing needs a longer runway; a headwind landing needs a shorter one. Crosswind landings are corrected with the sideslip method, the heading-change method, or a combination of both.

UAV-Q0472. When flying toward an approaching cold front, ________

Explanation

Flying toward a cold front, warm air is lifted, cloud develops from high altitude downward, and the aircraft is in a pressure trough, so pressure keeps falling.

UAV-Q0473. The main natural environmental factors affecting normal multi-axis aircraft operations are:

Explanation

A multi-axis aircraft flies in the air, so whether the ground is bumpy or flat does not affect flight. Wind direction affects flight to some extent, but not much. Temperature affects battery activity and significantly affects endurance. Wind force affects flight stability; winds above force 4 affect aerial photography operations.

UAV-Q0474. Generally, multi-axis aircraft operations in ground winds above force ____ affect aircraft safety and shooting stability.

Explanation

Winds above force 6 make autonomous flight difficult; winds above force 4 affect aerial photography.

UAV-Q0475. Intake icing leads to dangerous consequences. Which description is INCORRECT?

Explanation

Intake icing causes uneven airflow, blade vibration, and ice-shedding damage to the compressor, but a jet engine intake's strong suction makes direct blockage unlikely, so option C is incorrect.

UAV-Q0476. Which is the correct main basis for atmospheric layering?

Explanation

Atmospheric layers are classified mainly by the vertical temperature profile. Temperatures change differently in each layer: in the troposphere temperature falls with height; in the stratosphere temperature first stays constant then rises with height; in the mesosphere temperature falls with height; in the ionosphere temperature rises rapidly with height; in the exosphere temperature changes are strongly affected by external factors.

UAV-Q0477. Which of the following is NOT a type of satellite cloud image?

Explanation

Satellite cloud images are mainly infrared and visible-light images; multispectral satellite cloud images are not a main category.

UAV-Q0478. Among the following types of aircraft icing, which affects flight the most?

Explanation

Study note: for extreme icing, choose the two-ice option. Clear ice is hard and transparent, degrading aerodynamic performance; rime ice is rough, increasing drag; together they affect flight the most.

UAV-Q0479. On satellite cloud images, which of the following is NOT a mid-level cloud characteristic?

Explanation

On infrared cloud images, mid-level clouds appear medium gray, not dark gray, so option C is wrong.

UAV-Q0480. When an east wind blows at an airport, the best takeoff and landing direction is:

Explanation

Aircraft should take off and land into the wind. An east wind blows from east to west, so the takeoff and landing direction is from west to east.