Which of the following can provide cavitation protection?

Electronic pressure governors are designed to monitor and regulate water pressure in systems, which aids in preventing cavitation. Cavitation occurs when the pressure in a liquid drops below its vapor pressure, forming vapor bubbles that can cause damage when they collapse.

An electronic pressure governor can adjust the pressure dynamically and respond to changes in flow demand more accurately than mechanical governors or manual controls. This adaptability allows for maintaining a safe operating range of pressure, significantly minimizing the risk of cavitation. It can detect rapid fluctuations in pressure and provide immediate adjustments, ensuring that the system operates efficiently without reaching the critical levels that would lead to cavitation-related issues.

In contrast, mechanical pressure governors may not have the same responsiveness, manual throttle control requires constant monitoring and adjustment by the operator, and vacuum relief valves are mainly used to prevent negative pressure in a system rather than specifically addressing cavitation. Therefore, while those options have their applications, they do not offer the same level of protection against cavitation as an electronic pressure governor does.