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To obtain a faster signal for use in control, which one element would you make faster? (The process time constant is 3 seconds.) |
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| Study Questions |
Apply Your Knowledge |
| 7.11 An extension of Textbook Example 7.1, Case A. |
Performance Measures |
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To obtain a faster signal for use in control, which one element would you make faster? (The process time constant is 3 seconds.) |
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| 7.12 An extension of Textbook Example 7.2, which addresses the three-tank MIXING process, |
Control Approaches |
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Describe the response of the feedback control system to the following disturbances. |
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An increase of the supply pressure of the pure A fluid |
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| An increase of 10 K degrees in the fluid B temperature | |
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| An increase of 30% in the flow of fluid B. | |
| 7.13 Make all the necessary equipment changes and additions to be able to control the fluid level in in the draining tank in Figure 3.13. |
Control Approaches |
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| 7.14 A distillation tower similar to Figure 5.18 could have 40 trays and 10 components Therefore the number of compositions is over 400 (40 x 10). |
Control Approaches |
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| Which of these compositions should be controlled? |  |
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| What valves should be installed to allow the adjustment of flows for control? | |
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| Provide at least one controlled variable and measurement for each of the seven categories of control objectives. | |
| 7.15 For the two closed-loop control responses, rank which is better for each of the following performance criteria. |
Control Approaches |
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Stability,
Returns to set point, IAE (integral square
error), Rise time, Settling
time, Decay Ratio, Max |SP-CV| ,
and MAX MV overshoot |
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