Internal Combustion Engines
Pour point of fuel oil is the

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

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

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

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Internal Combustion Engines
Detonation is harmful due to

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
High intensity of knock causes crankshaft vibration and the engine runs rough
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
None of these

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