Internal Combustion Engines
Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows

Avoidance of overloading
Increasing the compression ratio
Adherence to proper fuel specification
Using additives in the fuel

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at bottom dead center and closes at top dead center
Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at 50° before bottom dead center and closes at 15° after top dead center
May open and close anywhere

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