In a flash evaporator, scale as a result of higher than normal temperatures is most likely to occur in the __________.

Correct Answer: Option A — salt water feed heater

In a flash evaporator, the salt water feed heater is the point where the water is raised to its highest temperature before entering the vacuum chamber. Because scale formation is temperature-dependent, this component is the most susceptible to mineral deposition, necessitating regular monitoring and chemical treatment of the feed.