In which of the following freshwater generators would an air ejector be unnecessary?

Correct Answer: Option A — Reverse-osmosis unit

Reverse-osmosis units operate via mechanical filtration rather than phase change, meaning they do not require a vacuum to lower the boiling point of water. Consequently, air ejectors, which are essential for removing non-condensable gases from vacuum-based evaporators, are unnecessary for the operation of an RO freshwater generator system.