Question 162Motor Plants - Assistant Engineer

The correct answer is C) positive displacement type. The lube oil pumps taking suction from the sump of most small marine engines are typically positive displacement type pumps. These pumps are well-suited for the task of drawing oil from the engine sump and delivering it to the various lubrication points within the engine. Positive displacement pumps can generate the necessary pressure to ensure adequate oil flow, even when the engine is operating at low speeds. In contrast, the other options like diaphragm, centrifugal, or eductor type pumps are not commonly used for this application in small marine engines.