Question 103General Subjects - 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 General Subjects 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 being formed in the evaporator will decrease.
CThe output of pump "7" will increase with a corresponding increase in pressure.
DThe amount of vapor formed in the evaporator will increase.
AI Explanation

The correct answer is B) The amount of vapor being formed in the evaporator will decrease. When valve "D" is opened during normal distiller operation, it allows additional water to enter the distiller system. This extra water will dilute the concentrated brine solution in the evaporator, reducing the amount of vapor being formed. As a result, the output of the distiller will decrease. The other answer choices are incorrect because: A) Opening valve "D" will not overload the jacket water cooler or cause an engine alarm. C) The output of pump "7" will decrease, not increase, due to the reduced vapor production in the evaporator. D) The amount of vapor formed in the evaporator will decrease, not increase, when valve "D" is opened.

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