Final answer:
In a typical Gas Turbine Engine, approximately 60% of the available energy from the combustion gas stream is extracted by the turbine.
Step-by-step explanation:
In a typical Gas Turbine Engine, the turbine extracts energy from the combustion gas stream to perform work. Based on the provided materials, while coal power plants convert about 40% of the energy released from combustion to electricity, gas turbines can approach 60% efficiency mostly due to higher operating temperatures. This suggests that in a typical gas turbine engine, about 60% of the available energy from the combustion gas stream is extracted for useful work. However, real heat engines like power plants or automobile engines tend to reach only about halfway to their theoretical efficiency due to practical challenges, so actual efficiencies may vary.