Question 126Gas Turbine - Assistant Engineer

The correct answer is D) Power turbine. In a marine gas turbine propulsion system, the kinetic and thermal energy required to drive the main propeller shaft is extracted by the power turbine. The power turbine is a separate turbine stage downstream of the combustor that extracts energy from the hot, high-pressure exhaust gases and converts it into mechanical power to drive the propeller shaft. The other options are incorrect because: A) The compressor provides compressed air to the combustor, but does not extract power from the system. B) The combustor is where fuel is burned to heat the compressed air, but it does not extract power. C) The exhaust gases contain the thermal and kinetic energy that is extracted by the power turbine.