Which of the following is a method to prevent cavitation in hydraulic systems?

Maintaining proper fluid levels is an effective method to prevent cavitation in hydraulic systems. Cavitation occurs when the pressure in a fluid drops below its vapor pressure, leading to the formation of vapor bubbles that can cause damage when they collapse. By ensuring that the fluid levels in the system are adequate, there is enough hydrostatic pressure to keep the fluid pressure above the vapor pressure, thereby preventing the formation of vapor bubbles.

Maintaining appropriate fluid levels can also help ensure that pumps operate within their intended range, further mitigating the risk of cavitation. This means that the pumps can consistently draw in liquid at sufficient pressure, avoiding conditions that could lead to cavitation.

Other methods mentioned may have their own importance in a hydraulic system, but they do not address the fundamental issue of maintaining adequate pressure to prevent cavitation as effectively as ensuring proper fluid levels does.