For the control system implementation Both the air and the f
     For the control system implementation:  Both the air and the fuel are assumed to be the disturbance.  The air is assumed to be the disturbance, and the fuel is manipulated  The air is assumed to be the disturbances, and the fuel is manipulated  Both the air and the fuel are assumed to be the manipulated.  Using the P&ID; for basic Column Control answer the following questions:   
  
  Solution
The air is assumed to be disturbance and the fuel is manipulated
The reason is the air flow is not controlled and its inlet and oulet is not defined/designed with valves
The fuel flow is controlled as per the diagram shown in the question

