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Which system recirculates crankcase gases to the intake?

  • A.The evaporative system
  • B.A ventilation system drawing blow-by gases from the crankcase into the inlet tract so they are burnt in the engine
  • C.Positive crankcase ventilation
  • D.Exhaust gas recirculation, which returns a portion of the exhaust to the intake in order to reduce the emissions

Answer: C

A metered flow from the crankcase to the inlet burns the blow-by rather than venting it. The last option describes exactly that path, which makes it a correct and more detailed version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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