Why can the steam turbines exhaust often supply the process with steam?

The steam turbine exhaust can often supply the process with steam primarily because it is free of oil. In many industrial applications, steam must be clean to avoid contamination of the processes it serves. Oil contamination can lead to various issues, including equipment fouling, process contamination, and potential health hazards. Therefore, the exhaust from steam turbines, which typically operates under strict conditions to avoid oil carryover, can be utilized directly in processes that require clean steam.

Regarding the other options, the steam exhaust does not remain under high pressure; typically, steam turbines exhaust at lower pressures. While steam can exist at or near the boiling point in various conditions, this does not specifically guarantee its suitability for process use. Furthermore, excess moisture in the exhaust can be detrimental because it can lead to water hammer or reduced thermal efficiency in the processes that require dry steam. Thus, the cleanliness of the steam exhaust makes it suitable for supply to processes, ensuring operational efficacy and safety.