a. What are the inherent characteristics of chemical processes that may disfavor the use of a...

 

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a. What are the inherent characteristics of chemical processes that may disfavor the use of a feedback controller alone? (2 mark) Ans: b. Consider the transfer function below: (6 marks) N(s) K (Ts+1) ses G(s) = = P(s) S (Ts + 1) Give the name of each term below: Ans: in N(s) K: in P(s): (T25 + 1) (Ts + 1) S: S: What is the effect each term below on the process variable (PV) ? (Ts+1) (T2S+1) c. In a PID, where would you place a filter and why? What is the role of a filter? (4 marks). d. Consider the variation of the process variable (PV) y (t) in a closed- loop system below: a) What kind of process input change causes the PV variations during the time up 80min? and from 80 to 160min? (3 marks) Time: 0 to 80min. Time: 80 to 160min a. What are the inherent characteristics of chemical processes that may disfavor the use of a feedback controller alone? (2 mark) Ans: b. Consider the transfer function below: (6 marks) N(s) K (Ts+1) ses G(s) = = P(s) S (Ts + 1) Give the name of each term below: Ans: in N(s) K: in P(s): (T25 + 1) (Ts + 1) S: S: What is the effect each term below on the process variable (PV) ? (Ts+1) (T2S+1) c. In a PID, where would you place a filter and why? What is the role of a filter? (4 marks). d. Consider the variation of the process variable (PV) y (t) in a closed- loop system below: a) What kind of process input change causes the PV variations during the time up 80min? and from 80 to 160min? (3 marks) Time: 0 to 80min. Time: 80 to 160min