Coast Guard Exams
Question 103General Subjects - Assistant Engineer70% to pass

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 question 103
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.