Question 153Motor Plants - Assistant Engineer

The correct answer is D. The main lube oil manifold for the diesel engine shown in the illustration MO-0122 is represented by the letter "O". This is based on the standard conventions and labeling used in marine engineering schematics and diagrams, where the letter "O" is commonly used to denote the main lube oil manifold or system. The other answer choices, "11", "17", and "N", do not correspond to the standard labeling conventions for a main lube oil manifold and are therefore incorrect.