How does the MFC control speed in a gas turbine system?

The correct answer focuses on the role of the mass flow controller (MFC) in managing the fuel supply to the gas turbine system. The MFC is crucial for maintaining the desired rotational speed of the turbine. When the turbine operates, it requires a precise balance of fuel and air to generate the necessary thrust.

By adjusting the fuel flow, the MFC can respond to changes in demand or load on the turbine. If the speed of the turbine decreases, the MFC enhances the fuel flow to boost energy output, thereby restoring the desired speed set by the power level. Conversely, if the speed exceeds the desired limit, the MFC can reduce the fuel supply, slowing the turbine down appropriately.

This mechanism ensures that the gas turbine operates efficiently and safely by maintaining optimal performance parameters through fuel flow adjustments, providing a critical control function in the overall turbine management system.