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Which component cools the recirculated gas?

  • A.The intercooler, which cools the charge air and therefore cools the recirculated gas mixed with it as well
  • B.Nothing
  • C.A coolant fed exchanger in the recirculation path, which transfers heat from the exhaust gas into the cooling system
  • D.A heat exchanger using engine coolant

Answer: D

A small coolant fed exchanger removes heat from the recirculated gas. The last option describes exactly that device, which makes it a correct and more detailed version. It adds load to the cooling system. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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