Question 145Motor Plants - QMED

The correct answer is C) Lube oil cooler and jacket water cooler. This is correct because in a typical marine diesel engine cooling water system, the lube oil cooler and jacket water cooler are connected in series. The cooling water circulates through the lube oil cooler first to remove heat from the engine oil, then continues on to the jacket water cooler to remove heat from the engine coolant. The other options are incorrect because the camshaft lube oil cooler and scavenge air coolers are not directly connected in series, and the jacket water cooler is not directly connected in series with the scavenge air coolers.