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Which term describes the daily temperature cycle emission?

  • A.Refuelling loss
  • B.The diurnal emission, measured over a defined temperature cycle with the vehicle parked and the engine stopped
  • C.Diurnal loss
  • D.Running loss, which occurs while the vehicle is being driven and the fuel system is at its highest temperature

Answer: C

Diurnal loss is measured over a defined temperature cycle with the vehicle parked. The last option describes exactly that definition, which makes it a correct and more precise version. Running and refuelling losses are separate. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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