Suppose that we want to maintain the level of liquid in a process tank close to 2m in height. But an uncontrolled drain valve produces unpredictable disturbances in the output flow rate.
Then, one would need to use a level sensor to measure the level of liquid and to control the Input feed valve to counteract the effect of the disturbance created by the drain valve.
Draw the block diagram of discussed water level control system.

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fluid flow rates are controlled by varying the degree of opening of a gatetype valve Because ... View the full answer