A liquid-level control system can be configured in either of two ways: with a control valve manipulating flowof liquid into the holding tank , or with a con-trol valve manipulating the flow of liquid from the tank. Assuming that the liquid-level transmitter alwaysis direct-acting,(a)For each configuration, what control action (direct orreverse) should a proportional pneumatic controller have if the control valve is air-to-close?(b)If the control valve is air-to-open?

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