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Which condition requires the recirculation to be reduced or stopped?

  • A.Full load, where the oxygen is needed for combustion
  • B.Idle, where the engine is most tolerant of dilution and therefore requires the greatest recirculation rate
  • C.Nothing
  • D.High load operation, since diluting the charge would reduce the power and produce excessive smoke from the engine

Answer: A

At full load every part of the oxygen is needed. The last option explains exactly that, which makes it a correct and more instructive version. Idle is where dilution is least tolerated. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once.

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