Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?
Correct answer: A. Tank 3
- A. Tank 3
- B. Tank 2
- C. Tank 1
- D. Tank 4
Explanation
The secondary sensor should detect the disturbance before it significantly affects the primary outlet temperature, while still being downstream of the disturbance entry point. Tank 3 provides this earlier measurement, leaving tank 4 as the primary measurement point.
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