What does the blue smoke in diesel engine indicate?(a) Unburnt oil(b) HC(c) NOx(d) COThe question was posed to me in a job interview.The query is from Engine Emissions in section Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

What does the blue smoke in diesel engine indicate?(a) Unburnt oil(b)

1.	What does the blue smoke in diesel engine indicate?(a) Unburnt oil(b) HC(c) NOx(d) COThe question was posed to me in a job interview.The query is from Engine Emissions in section Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering
Answer» The CORRECT option is (a) UNBURNT oil For explanation: Blue smoke comes out from the EXHAUST when there is unburnt oil in the DIESEL engine. A very THIN layer of the oil gets deposited on the cylinder wall to provide the lubrication between the walls and the moving piston.

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