Q3. (4 marks) A liquid-level control system (Figure 1) can be configured in either of two ways: with a control valve manipulating the flow of liquid into the holding tank (system II), or with a control valve manipulating the flow of liquid from the tank (system I). Assume that the liquid-level transmitters are direct acting. For each configuration, what control valve A-O or A-C should be used? a) If level controller is reverse acting? Justify your answer b) If level controller is direct acting? Justify your answer I 2012 Figure 1 system I system