What is the standard percentage of air to fuel in a Gas Turbine Machinery (GTM)?

The standard air-to-fuel ratio in a gas turbine is crucial for ensuring efficient combustion and optimal performance. The correct response, which indicates a composition of 70% air to 30% fuel, reflects the typical operational parameters of gas turbine machinery.

In the combustion process of gas turbines, the primary aim is to mix the fuel with a sufficient amount of air to allow for efficient burning, which is generally around a 70:30 ratio. This proportion enables the combustion process to be effective, providing the necessary energy output while also minimizing emissions. The excess air helps in achieving complete combustion and aids in controlling combustion temperatures, which can prevent various issues such as combustion instability or overheating of components.

The other choices propose different ratios that do not align with standard operational specifications for gas turbines. Higher fuel concentrations typically result in incomplete combustion or lower efficiency, while higher air percentages may lead to a reduction in the energy that can be extracted from the fuel. Thus, the air-fuel ratio of 70% air to 30% fuel is the most effective and widely recognized standard for optimizing performance in gas turbine systems.