248. If the wearing rings of device «7» shown in the illustration become worn, how will the evaporation rate in «23» be affected

The rate of evaporation is dependent on the level of vacuum maintained within the unit, and not the flow of water to the unit.
The rate of evaporation will decrease.
The rate of evaporation will not be affected as the standby pump, labeled "8" will be used instead.
Device "7" does not use wearing rings, as these are normally positive displacement pumps.

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