Question 122Motor Plants - QMED
70% to passWhat statement is true concerning oil-lubricated stern tube bearings?
AThe forward and after seals are both designed to prevent the ingress of sea water and the after seal is designed to retain the lubricating oil within the bearing.
BThe forward and after seals are both designed to prevent the ingress of sea water and the forward seal is designed to retain the lubricating oil within the bearing.
CThe forward and after seals are both designed to retain the lubricating oil within the bearings and the forward seal is designed to prevent the ingress of sea water.
DThe forward and after seals are both designed to retain the lubricating oil within the bearings and the after seal is designed to prevent the ingress of sea water.
AI Explanation
The correct answer is D. The forward and after seals on an oil-lubricated stern tube bearing are both designed to retain the lubricating oil within the bearing. The after seal is specifically designed to prevent the ingress of sea water into the stern tube. This is necessary to maintain the proper lubrication of the bearing and prevent damage or failure. The other answer choices are incorrect because they do not accurately describe the function of the forward and after seals. Options A, B, and C either misstate the purpose of the seals or assign the wrong seal the task of preventing sea water ingress.
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