Question

which system helps prevent pollution by recirculating engine blow - by gases into the combustion chamber? a) evaporative emissions (evap) b) positive crankcase ventilation (pcv) c) exhaust gas recirculation (egr) d) exhaust

Explanation:

The Positive Crankcase Ventilation (PCV) system recirculates engine blow - by gases into the combustion chamber to prevent pollution. The EVAP system deals with fuel vapors, EGR recirculates exhaust gases, and the exhaust system just expels gases out of the vehicle.

Answer:

B. Positive Crankcase Ventilation (PCV)