What process supplements air supply to the intake system by increasing pressure?

Turbocharging is a process that supplements the air supply to the intake system by using exhaust gases to drive a turbine that compresses air entering the engine. This increases the pressure and density of the air, allowing for more oxygen to be available for combustion, thereby improving engine efficiency and power output.

Supercharging, which is the correct answer in this case, operates on a similar principle but is driven mechanically, typically by the engine's crankshaft. The supercharger forces more air into the intake manifold, increasing pressure and allowing more fuel to be burned, which enhances performance.

While compressing refers to the general action of reducing the volume of a gas and increasing pressure, it does not specifically relate to the context of how air is supplied to an intake system in diesel engines. Ventilation, on the other hand, deals more with the circulation of air rather than compressing or forcing air into an engine's intake. Therefore, supercharging is the most accurate term for what directly supplements the air supply to the intake system by increasing pressure.