The quantity and density of brine discharged from the last effect of a flash type evaporator should be kept at a constant value so as to __________.

Correct Answer: Option A — ensure distillate quality and distilling plant efficiency

Maintaining constant brine density and quantity is critical for plant efficiency. Fluctuations in brine concentration affect the boiling point and heat transfer rates. Consistent operation ensures that the plant remains within design parameters, preventing excessive scaling and maintaining the purity of the distillate produced during continuous operation.