Question 462Motor Plants - Assistant Engineer

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If valve "D" is opened during the normal operation of the distiller shown in the illustration, which of the events listed will occur? Illustration MO-0111

Diagram for USCG Motor Plants Assistant: If valve "D" is opened during the normal operation of the distiller shown in...
AThe jacket water cooler will be overloaded, eventually causing a critical engine alarm.
BThe amount of vapor formed in the evaporator will increase.
CThe output of pump "7" will increase with a corresponding increase in pressure.
DThe amount of vapor being formed in the evaporator will decrease.
AI Explanation

The correct answer is D) The amount of vapor being formed in the evaporator will decrease. Opening valve "D" during normal operation of the distiller would allow some of the vapor being formed in the evaporator to escape, rather than being directed through the system. This would reduce the overall amount of vapor being generated, as the evaporator's capacity to produce vapor would be compromised. The other answer options are incorrect because: A) Opening valve "D" would not overload the jacket water cooler or cause an engine alarm. B) Opening valve "D" would decrease, not increase, the amount of vapor formed in the evaporator. C) Opening valve "D" would not increase the output or pressure of pump "7".

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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