What does the turbine do with exhaust gas energy?

The correct answer focuses on the role of the turbine in a gas turbine engine, where it converts exhaust gas energy into mechanical energy. In gas turbine engines, the combustion of fuel generates high-temperature, high-pressure exhaust gases. As these gases pass through the turbine, they exert force on the turbine blades, causing the turbines to spin. This mechanical energy generated is crucial because it drives the compressor, which is responsible for bringing in fresh air for the combustion process, as well as powering various accessories necessary for the overall engine operation.

In contrast, thermal energy transformation mainly occurs during the combustion process rather than within the turbine itself. The turbine does not absorb all the pressure energy; instead, it utilizes a portion of the pressure energy from the exhaust flow to perform work. Lastly, while exhaust gases can be cooled, this is not the primary function of the turbine; the primary role is the conversion of exhaust gas energy to mechanical work. Thus, option B accurately describes the primary function of the turbine in the context of energy transformation within a gas turbine engine.