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

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

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

May start and end anywhere
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
Starts at top dead center and ends at 40° before bottom dead center

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