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The purpose of crankcase ventilation is to

The purpose of crankcase ventilation is to Correct Answer Remove sludge and sediments

In the crankcase oil gets diluted due to the mixture of blow by gases, carbon particles, metallic particles, sand, dust, dirt and the acids formed out of the exhaust gas condensation such as sulphuric acid and phosphoric acid. This affects lubrication and forms a sludge (accumulation of dirty oil). Frequent cleaning and change of oil are needed. To overcome this problem, crankcase ventilation is provided. Fresh air is allowed in the crankcase which passes out after circulation through a breather pipe in the rear. This arrangement is known as open type crankcase ventilation.

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