Question 123General Subjects - Assistant Engineer

The correct answer is B) Flash type unit. The flash type fresh water generator operates on the principle of evaporating pre-heated sea water by causing it to undergo a pressure drop into a vacuum. This creates a flash evaporation process, where the sea water rapidly vaporizes, leaving behind the salts and minerals. The vapor is then condensed to produce fresh water. The other options are incorrect because: A) Submerged tube units use heat exchange to evaporate sea water, C) Titanium plate units use reverse osmosis, and D) Reverse osmosis units use membrane filtration to remove salts and minerals from sea water, rather than evaporation.