China Civil UAV Theory Questions — Questions 416–425

Low battery may make it impossible to complete the planned flight, requiring an emergency return. Excessive distance or altitude beyond visual range and FPV monitor interference do not directly threaten flight safety.

In actual aerial photography, exposure parameters should be chosen reasonably according to lighting conditions and shooting needs. Although high ISO increases the image sensor's sensitivity and captures more light in dim conditions, excessively high ISO also increases image noise and reduces image quality.

ISO measures the image sensor's sensitivity to light. Fixed ISO means the sensor's sensitivity stays constant, helping maintain consistent exposure under various lighting conditions. Fixed aperture means the amount of light through the lens is constant during flight, which helps maintain stable exposure but may cause overexposure or underexposure under some lighting. Fixed shutter speed does help maintain a certain exposure level, but if lighting changes significantly (e.g., from bright to dark or dark to bright), a fixed shutter speed may not adapt, causing unstable image brightness.

At night, light is usually dim, and the camera needs more time to capture enough light for a clear image. Reducing flight speed means the camera stays longer over a given area, capturing more light information — an effective way to compensate for insufficient night light and ensure normal exposure. Option A is correct. Reducing flight altitude may bring the camera closer to night light sources, but it does not guarantee normal exposure and may affect the overall composition, so option B is incorrect.

Battery life is shorter in low temperatures, eliminating options B and C. In environments with large temperature differences, the lens is cooler and may contact moisture in the air and fog up, so option A is correct.

The “water-ripple” effect occurs because aircraft vibration is transmitted to the camera, causing unstable, ripple-like image interference. Targeted vibration damping can effectively improve it.

Multi-axis operations must consider public safety: use designated airspace and avoid crowded areas.

Study note: lateral axis — pitch; longitudinal axis — roll; vertical axis — yaw. Pitch is rotation about the lateral axis, roll about the longitudinal axis, and yaw about the vertical axis.

Study note: lateral axis — pitch; longitudinal axis — roll; vertical axis — yaw. Pitch is rotation about the lateral axis, roll about the longitudinal axis, and yaw about the vertical axis.

Study note: lateral axis — pitch; longitudinal axis — roll; vertical axis — yaw. Pitch is rotation about the lateral axis, roll about the longitudinal axis, and yaw about the vertical axis.