Question 145Motor Plants - QMED
70% to passAccording to the illustrated main and auxiliary diesel engine cooling water systems diagram, which of the following heat exchangers are connected directly in series with one another? Illustration MO-0129
ACamshaft lube oil cooler and jacket water cooler
BJacket water cooler and scavenge air coolers(s)
CLube oil cooler and jacket water cooler
DCamshaft lube oil cooler and scavenge air coolers(s)
AI Explanation
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.
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