Question 97General Subjects - Assistant Engineer70% to pass
A vacuum is initially created in a flash-type distilling plant by _______________.
AI Explanation
The correct answer is B) air ejectors, eductors, or a separate vacuum pump.
In a flash-type distilling plant, a vacuum is initially created using specialized equipment such as air ejectors, eductors, or a separate vacuum pump. These devices remove air and non-condensable gases from the system, allowing the feed water to "flash" into steam under low-pressure conditions. This flashing process is what drives the distillation and evaporation of the feed water, producing the distillate.
The other answer choices are incorrect because they do not accurately describe the mechanism for creating the initial vacuum in a flash-type distilling plant. The flashing of the feed water (A), the condensation of the salt water feed (C), and the condensation of the distillate (D) are all results of the distillation process, not the means of creating the vacuum required for it to occur.
Related Questions
#95 Indicated high salinity of the distillate discharged from a flash-type distilling plant will be a result of _______________.#96 Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the _______________.#98 The absolute pressure maintained in the shell of the salt water feed heater on most flash evaporators used on steam propelled vessels is _______________.#99 In the unit illustrated, the feed water temperature is required to be increased to 165°F or greater and must exist at this temperature when leaving _______________. Illustration GS-0053 #100 The brine level in the second-stage of a flash-type evaporator is determined in part by the feed rate, the rate of evaporation in both stages, and the _______________.