05-07-2014, 12:06 PM
MANIPAL UNIVERSITY VI Sem I & C Engineering, Examinations 2010
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1.a. Define (4)
a) Process Variable
b) Manipulated Variable
c) Controlled Variable
d) Load Disturbances
1.b. Derive the transfer function of the two interacting tanks which is having the inflow of Qin and the Q2 as shown in the figure below. The restriction of the control valve was R1 and R2 respectively. (10)
1.c. With a simple case study explain the degree of freedom of a process. (6)
2.a. Explain the process of linearization with a single tank system’s non linear equation. Also derive the linearized equation of the nonlinear system. (8)
2.b. With a neat sketch and derivation explain the process of mathematical model of mixing process with all three cases. (12)
PTO
Reg. No.
h 1
h 2
Q 2
Q 1
Qin
3.a. With a neat sketch derive and prove that the PI controller will eliminate the offset completely for the set point change and load change. (10)
3.b. Highlight the disadvantages of the derivative controller with the proof. (4)
3.c. Compute the response of the PI controller for the following error signal (6)
4.a. Explain the tuning rules of P, PI and PID controller based on the Process Reaction curve method with a neat sketch and formulae. (8)
4.b. Briefly explain the operation of the dead time compensator with a neat sketch and derivation. Also mention
the effect of dead time in the process transfer function. (12)
5.a. Differentiate the feed-forward and feedback controller. (6)
5.b. Why we should not use the feed forward controller alone in the process, also highlight the causes. (4)
5.c. Explain briefly about the ratio control with respect the case study of distillation column. (10)
6.a. Explain the construction of the control valve with a neat sketch. Also discuss about the factors
affecting the control valve operation. (8)
6.b. Explain the Inverse Response of the process? What are the causes of the inverse response (6)
6.c. Briefly explain the operation of the cascade control with the block diagram.