Improving brake power of a diesel engine (other parameters constant) Which change will increase brake power output for a given engine configuration? Choose the correct option.

Concept
Brake power rises with higher trapped air mass (more oxygen) enabling more fuel to burn. Supercharging or turbocharging raises intake pressure, increasing air density and mass flow per cycle.

Why others decrease power
Lower density or lower pressure reduce air mass. Higher intake temperature lowers density at a given pressure, also reducing mass.

Final Answer
Increase the pressure of intake air