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Which property of the recirculated gas produces the effect?

  • A.The absence of oxygen combined with the high specific heat of the carbon dioxide and water vapour it contains
  • B.Its inertness and high heat capacity
  • C.Its temperature, which is lower than that of the incoming air and therefore cools the charge within the cylinder
  • D.Its pressure

Answer: B

Triatomic gases absorb heat well and the dilution slows the reaction. The last option names both contributions, which makes it a correct and fuller version. Recirculated gas is generally hotter than the air it replaces. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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