Question 132General Subjects - Assistant Engineer

The correct answer is C) From having passed through "23". The latent heat required to create vapor from the feed water in the illustrated distiller is obtained as the feed water passes through device "23", which is the distillation chamber or evaporation section. In this chamber, the feed water is heated to the point of evaporation, and the latent heat required for this phase change is drawn from the heat source, such as the engine exhaust or other heat source. The other answer choices are incorrect because: A) the heat exchanger "3" is used to pre-heat the feed water, but does not provide the latent heat for evaporation; B) device "20" is likely a separator or demister, not the source of latent heat; and D) device "24" is likely a condenser, which removes latent heat from the vapor, rather than providing it.