Internal Combustion Engines
The increase of efficiency of a compression ignition engine, as the load decreases, is due to

Hit and miss governing
Higher maximum temperature
Qualitative governing
Quantitative governing

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Internal Combustion Engines
Flash point of fuel oil is

Temperature at which it catches fire without external aid
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
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it solidifies or congeals

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