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Which reason requires the purge flow to be metered?

  • A.Only noise
  • B.Vapour is fuel, so an uncontrolled purge would enrich the mixture unpredictably and disturb the fuel control
  • C.The vapour affects the mixture strength
  • D.None, since the vapour is inert and therefore has no effect upon the combustion within the engine at all

Answer: C

Purged vapour is fuel and must be accounted for in the mixture. The last option explains exactly that, which makes it a correct and more instructive version of the same answer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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