A vacuum is initially created in a flash type distilling plant by __________.

Correct Answer: Option B — air ejectors, eductors, or a separate vacuum pump

Flash-type distilling plants require a vacuum to lower the boiling point of seawater. This vacuum is established and maintained by mechanical means, typically air ejectors using steam, eductors using water, or dedicated vacuum pumps, which remove non-condensable gases from the condenser shell to sustain the required pressure differential.