Internal Combustion Engines
The purpose of testing an internal combustion engine is

To conform the data used in design, the validity of which may be doubtful
To determine the information, which cannot be obtained by calculations
All of these
To satisfy the customer regarding the performance of the engine

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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
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
It catches fire without external aid

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

Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
May open or close anywhere
Opens at 20° before top dead center and closes at 40° after bottom dead center

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