OR:\\ In a boiler system used to generate steam for electrical power station, the air/fuel ratio is 10. The set point for fuel loop is determined from steam pressure using PID controller. The approximated transfer function (TF) for fuel flow system is: 1.3e-2.1s 2.1s + 1 And for air flow system is: 0.8e-0.2s TF. = s + 1.4 Design suitable controllers for fuel and air flow system