🔍 Key Concepts

• Series vs. parallel flow in cooling water systems • How jacket cooling water is routed through different engine-related coolers • Identifying which coolers share the same continuous piping path without a branching point

💭 Think About

• Trace the jacket cooling water line from the jacket water pumps and follow its path through each cooler—where does the water go immediately after leaving each cooler? • Look for any coolers that have no branch or mixing point between them—just a single line exiting one and entering the next. • Compare how the camshaft lube oil cooler, lube oil cooler, and scavenge air cooler(s) are tied into the system: which of these actually sit one right after the other on the same loop?

✅ Before You Answer

• Confirm the piping color/line type (central cooling vs. jacket cooling) that actually passes through each of the four coolers named in the choices. • Verify whether there is any junction, valve, or tee between two coolers—if there is, they are not strictly in series. • Make sure you are following the same fluid (cooling water), not the lube oil side, when deciding which exchangers are in series.