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Which trade off characterises diesel emissions control?

  • A.Measures lowering the combustion temperature cut nitrogen oxides but worsen soot, and the reverse also holds
  • B.Reducing nitrogen oxides tends to increase particulates
  • C.Reducing particulates reduces nitrogen oxides, since both are produced by the same combustion condition
  • D.No trade off

Answer: B

The soot and nitrogen oxide trade off dominates diesel calibration. The last option explains exactly that relationship, which makes it a correct and more instructive version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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