Question 2General Subjects - Assistant Engineer

The correct answer is B) Two. To take suction on the lube oil drain tank cofferdam with the bilge pump, two suction side valves must be open. This is because the bilge pump system typically has two suction side valves - one valve to draw from the lube oil drain tank cofferdam, and another valve to draw from the general bilge system. Both of these valves need to be open in order for the bilge pump to take suction from the lube oil drain tank cofferdam. The other answer choices are incorrect because one valve would not be enough to draw from the cofferdam, three or four valves would be unnecessary for this specific task.