Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens at bottom dead center and closes at top dead center
Exhaust valve opens just after bottom dead center and closes just before top dead center
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
May open and close anywhere

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere
Starts at top dead center and ends at 40° before bottom dead center

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Internal Combustion Engines
Flash point of fuel oil is

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals
Temperature at which it catches fire without external aid
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

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MORE MCQ ON Internal Combustion Engines