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Which valve controls the recirculated flow?

  • A.Nothing
  • B.A dedicated valve positioned by a vacuum diaphragm or an electric motor according to the strategy of the controller
  • C.An electrically or vacuum operated recirculation valve
  • D.The throttle, which restricts the intake and therefore determines the quantity of exhaust gas admitted to it

Answer: C

A dedicated valve meters the flow under the controller's command. The last option describes both actuation types, which makes it a correct and fuller version. The throttle genuinely assists on some diesel systems. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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