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

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

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

Starts at 30° before top dead center and ends at 50° before bottom dead center
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

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