Internal Combustion Engines
Which of the following is false statement?Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following

Detonation
Oil sludge in the engine crank case
Formation of hard coating on piston skirts
Piston ring and cylinder wear

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at top dead center and ends at bottom dead center
May start and end anywhere

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