ANS:B - create vacuum.

The steam ejector is used to: create vacuum. Explanation: A steam ejector, also known as a steam jet ejector or simply a jet ejector, is a device that uses steam as a motive fluid to create a vacuum in a process system. It operates based on the principle of fluid dynamics, where a high-velocity jet of steam entrains and compresses a gas or vapor, reducing its pressure and creating a vacuum. Therefore, the primary purpose of a steam ejector is to create a vacuum, making it useful in various industrial processes such as distillation, evaporation, and vacuum drying. It is not used specifically to remove condensate from steam pipelines or to superheat the steam.