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Which parameter must the dynamometer reproduce?

  • A.The vehicle's road load and inertia
  • B.The ambient temperature, which is the only variable that affects the emissions measured during the test cycle
  • C.Nothing
  • D.The rolling and aerodynamic resistance together with the vehicle mass, so the engine works as it would on the road

Answer: A

Road load and inertia must be simulated for the result to mean anything. The last option explains exactly that requirement, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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