Internal Combustion Engines
The brake power of a diesel engine, keeping other parameters constant, can be increased by

Decreasing the density of intake air
Decreasing the pressure of intake air
Increasing the temperature of intake air
Increasing the pressure of intake air

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

Starts at bottom dead centre and ends at top dead centre
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre
May start and end anywhere

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Internal Combustion Engines
Pour point of fuel oil is the

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
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

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