please be clear

Q1 (40%). A blending tank has two inlet streams with mass flow rates wi and w; and an exit stream with flow rate ws. There is a valve on the outflow line that is used to establish flow rate ws. The cylindrical tank is 1.7 m tall and 1.1 m in diameter. The liquid has a density of 750 kg/m . Nominal flow rates are wi= 185 kg/min and W2 = 120 kg/min. In addition, the nominal inlet stream mass fractions of component A are x = x2 = 0.45. The process has been operating for a long time with constant flow rates and inlet concentrations. Under these conditions, exit mass fraction x = 0.45 and level h = 1.25 m at steady-state. Useful information: The tank is perfectly stirred. Exit flow rate is modelled by Wz = CyVh a) What are the controlled variables, manipulated variables and possible disturbance variables? (5 pts) b) Derive unsteady-state model equations. State all assumptions. (15 pts) c) What are the values of w, and the constant, C. (10 pts) d) Would you suggest feedback or feedforward control method for this process? Discuss. (10 pts)