Question 448Motor Plants - Assistant Engineer

A) gravity disk inside diameter is too large is the correct answer. The gravity disk inside the centrifuge is responsible for separating the fuel oil from the sludge and water. If the gravity disk's inside diameter is too large, it will not create enough centrifugal force to effectively separate the fuel oil, causing it to be continuously ejected with the sludge and seal water. The other options are incorrect because: B) a too small gravity disk diameter would have the opposite effect, creating excessive centrifugal force; C) low back pressure would not directly cause the fuel oil to be ejected with the sludge; and D) the number of disks in the stack would not affect the separation caused by the gravity disk's diameter.