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What does the blue smoke in diesel engine indicate?

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in Automobile Engineering by (80.5k points)
What does the blue smoke in diesel engine indicate?

(a) Unburnt oil

(b) HC

(c) NOx

(d) CO

The 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

1 Answer

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Best 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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