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Which laboratory equipment measures emissions over a cycle?

  • A.A road route, which is driven by a test driver and therefore represents the real conditions more faithfully
  • B.An engine test bed
  • C.A rolling road applying the vehicle's road load, with the diluted exhaust sampled throughout the whole cycle
  • D.A chassis dynamometer with constant volume sampling

Answer: D

A chassis dynamometer with dilution sampling is the approval facility. The last option describes exactly that, which makes it a correct and more detailed version. Road testing is a separate later addition. 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. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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