Question 460Motor Plants - Assistant Engineer

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If the wearing rings of device '7' shown in the illustration become worn, how will the evaporation rate in '23' be affected? Illustration MO-0111

Diagram for USCG Motor Plants Assistant: If the wearing rings of device '7' shown in the illustration become worn, how...

AThe rate of evaporation will decrease.

BThe rate of evaporation is dependent on the level of vacuum maintained within the unit, and not the flow of water to the unit.

CDevice '7' does not use wearing rings, as these are normally positive displacement pumps.

DThe rate of evaporation will not be affected as the standby pump; labeled '8' will be used instead.

AI Explanation

The correct answer is A) The rate of evaporation will decrease. The wearing of the rings in device '7' will affect the flow of water to the evaporation unit labeled '23'. As the rings wear, the pump's efficiency will decrease, reducing the amount of water flowing to the evaporation unit. This decreased water flow will directly impact the evaporation rate, causing it to decrease. The other answer choices are incorrect: B) The evaporation rate is dependent on the water flow, not just the vacuum level. C) Device '7' is likely a centrifugal or other type of pump that does use wearing rings. D) The standby pump '8' would not be used unless the primary pump '7' failed completely.