Consider a 500 gallon tank that needs to be filled when the level goes below 25 gallons and will stop when the level goes above 475 gallons.

Consider a 500 gallon tank that needs to be filled when the level goes below 25 gallons and will stop when the level goes above 475 gallons. Control systems can be either open‐loop or closed‐loop; each one of them has their own advantages and problems. For the system described above: 1)