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

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

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

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

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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
May start and end anywhere
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

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