Where a two-stage air ejector set is used in a two-stage flash evaporator, the first-stage air ejector takes suction from the second stage of the evaporator, and the second stage air ejector __________.

Correct Answer: Option C — takes suction from the first stage ejector discharge

In a multi-stage flash evaporator, the air ejector system operates in series. The first-stage ejector removes non-condensable gases from the lower-pressure stage, discharging them to the second-stage ejector, which then compresses the mixture further for discharge to the atmosphere or a condenser.