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Positive crankcase ventilation exists to

  • A.Filter the intake air
  • B.Route blow-by to the intake
  • C.Cool the crankcase oil
  • D.Reduce oil consumption only

Answer: B

Gases forced past the piston rings carry unburnt fuel and oil vapour, and venting them was once a substantial source of hydrocarbon emission. Routing them back to be burnt was among the earliest and cheapest control measures adopted.

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