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2003 Course Computer Aided Process Control (Elective II)

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Total No. of Questions : 12] [Total No. of Pages : 4 [3764] - 335 P 1629 B.E. (Chemical) COMPUTER AIDED PROCESS CONTROL (2003 Course) (Elective - II) (Semester - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Explain advantages of using digital computer in process control. [6] Distinguish between batch and continuous processes from process control view point. [6] With neat block diagram, explain DDC system in detail. [6] OR Q2) a) b) c) Q3) a) b) Explain the domain of various levels involved in heirarchical computer control systems. [6] [6] Explain functions of HMI in detail. Give historical background of use of computers in process control. [6] Explain state-space model of a m x n MIMO system. Define controllability and observability of such systems. Also state mathematical conditions for the same. [6] The input-output model for distillation column is given as follows xD ( s ) = 0.5exp( s ) 0.6 exp ( 1.1s ) R(s) V( s ) (6 s + 1)(3s + 1) ( 5s + 1) ( 2 s + 1) xB ( s ) = 0.5exp( s ) 0.3exp ( 1.3s ) R(s) V( s ) (5s + 1)( s + 1) (5s + 1)( s + 1) Where the vapour flow rate V (s), reflux rate R (s) are the input variables and the distillate composition x D ( s ), the bottom product composition x B ( s ) are the output variables. P.T.O. i) ii) Find RGA for this system. Based on the RGA, select the best pairing of input-output variables which will result in control loops having minimum input-output interactions. iii) If the resulting control loops still possess significant interaction between them, design two decouplers that will produce noninteracting control loops. [10] OR Q4) a) i) ii) b) i) ii) Draw block diagram showing input-output interactions for a 2 x 2 system having 2 inputs u1 , u2 and 2 outputs y1 & y2 . State inputoutput model for this system. Define RGA for the above system. State properties of RGA and explain the rules for selecting the best pairing of input-output variables that will result in minimum interaction between the loops. [6] State mathematical conditions for the observability and controllability of a MIMO system modeled as X = AX + Bu, Y = CX. Test controllability and observability of the system having statespace matrices. 6 18 6 2 B = 3 2 A= 3 1, , C = [1 3 1] 4 8 3 7 Q5) a) b) [10] A discrete time signal is represented by following sequence of sampled values Time (t) 0 T 2T 3T 4T 5T 6T Signal y*(t) 1 2 4 8 16 32 64 Where T is sampling interval in sec. i) Sketch the above signal. ii) Construct the original continuous - time signal using ZOH and FOH elements. Sketch the signals so obtained. State mathematical equations for the signals. [10] State the stability criteria for the system having discrete time transfer function. D( z ) = c ( z ) a0 + a1z 1 + a2 z 2 +.... + am z m = e ( z ) 1 + b1z 1 + b2 z 2 +..... + bn z n Also state the graphical stability criteria in Z-domain. Compare the stable and unstable regions in s-plane and z-plane. [6] [3764] - 335 -2- OR Q6) a) A DDC system has G P (s) = 10 ( 0.1s + 1) ( 2s + 1) H(s) = 1 exp( Ts ) s D(z) = kc T 1 + z 1 1 1 z I i) b) Find pulse transfer function HGP(z) and hence the characteristic equation. ii) Comment on nature of roots of characteristic equation and hence on stability of the system for kc = 0.1, I = 1, T = 1 [12] kc = 0.1, I = 1, T = 50 Compute initial and final values of continuous-time signal y(t), which has z-domain transfer function in the form. y (z) = 0.39z 1 (1 z 1 ) (1 0.61z 1 ) [4] SECTION - II Q7) a) b) State importance of interface in computer-control system. Explain different types of process-related interfaces. [8] State importance of communication in computer-control systems. Explain communication heirarchy for process control. [8] OR Q8) a) b) Q9) a) b) Explain different topologies used in networking computers used for process control purpose. [8] [8] Explain data transfer techniques-polling and interrupt. Explain basic components of a DCS system. With neat block diagram, explain basic components of a PLC. OR [3764] - 335 -3- [8] [8] Q10)a) b) Q11)a) b) Explain the following protocols used in DCS communication systems CSMA / CD, token ring, token bus. [8] Distinguish between PC & PLC. State advantages of using PLC for process control over DDC systems. [8] Explain the distinguishing features of process control design problem. Explain the sequence of steps followed in process control, design. [10] Explain temporal heirarchy of control structures in plantwide control systems. [8] OR Q12)Write short notes on the following : a) Integration of control design methods. b) Definition of design problem. [3764] - 335 -4- [18]

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