What is a turbocharger and its function in a power plant?

A turbocharger is a device that significantly enhances the power output of an engine by utilizing the energy from the engine's waste exhaust gases. It consists of a turbine and a compressor; as exhaust gases flow through the turbine, it spins and drives the compressor, which forces additional air into the engine's intake. This increase in air density allows for more fuel to be burned, resulting in greater power output without the need for a larger engine.

In the context of a power plant, the efficiency and performance gains provided by a turbocharger are crucial, as they allow for improved fuel efficiency and reduced emissions per unit of power produced. By recycling waste gases, turbochargers not only enhance engine performance but also contribute to more sustainable operation by making better use of the energy available.

The other options do not accurately describe the function of a turbocharger. While emissions reductions are essential in modern engines, the primary role of a turbocharger is performance enhancement through the use of exhaust gases. Similarly, the recycling of water in cooling towers pertains to heat management rather than boosting engine performance, and a control system for boiler pressure relates to different operational systems within a power plant.