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Which further condition suppresses recirculation?

  • A.Operation below a coolant temperature threshold, since combustion stability and hydrocarbon emissions both suffer
  • B.A cold engine below its operating temperature
  • C.A hot engine, whose combustion temperature is already high and therefore requires the greatest dilution possible
  • D.Nothing

Answer: B

Recirculating into a cold engine destabilises combustion and raises hydrocarbons. The last option explains exactly that, which makes it a correct and more instructive version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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