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2003 Course Computer Aided Process Control (Elective II)

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Total No. of Questions : 12] P1094 [Total No. of Pages :3 [3864] - 335 B.E. (Chemical) COMPUTER AIDED PROCESS CONTROL (2003 Course) (Elective - II) (Sem. - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two Sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) State advantages of digital computer control system over electronic control systems. [6] b) What is HMI? State its functions. c) Distinguish between centralized and distributed computer control systems. [6] [6] OR Q2) Explain DDC systems. [6] b) Compare supervisory control and hierarchical control systems. [6] c) Q3) a) Compare centralized and distributed control systems. [6] a) A process is modeled as X = AX + BU, Y = CX. Define controllability and observability of the process. Also state mathematical conditions for testing controllability and observability of a process. [8] b) Define RGA for a 2x2 process having steady-state gain matrix . k12 k k = 11 k 21 k 22 State properties of RGA and use of RGA for determination of the best pairing of input-output variables. [8] P.T.O. OR Q4) Explain use of decouplers for designing non-interacting control loops.[8] b) Explain the distinguishing characteristics of MIMO systems in comparison with SISO systems. Give suitable examples. [8] a) Explain functions of sample hold elements in digital control systems.[8] b) Q5) a) Starting from Laplace-domain transfer function model of a classical PID-controller, derive its discrete-time form in position and velocity forms. [8] OR Q6) a) What are direct synthesis (DS) digital controllers? Draw its block diagram and derive its transfer function D(Z). [8] b) What are dead beat controllers? Derive the dead beat controller for a F.O. process (K = = 1) with ZOH for a unit step change in S.P. [8] SECTION - II Q7) a) Describe digital interfaces used in control systems. [6] b) Explain layered networking of process control systems. [6] c) Explain parts of process control software. [6] OR Q9) a) Explain polling and interrupt methods of communication between process control computers and peripheral devices. [9] b) Q8) Explain network topologies used for networking of process control computers. [9] Describe the essential components of a DCS system viz - GOS, LOS, LP, I/O boards, P/S and operator s interface. [16] OR Q10) Describe PLC architecture alongwith essential components viz - P/S, I/O systems, memory, programmer units, peripheral devices. Also state advantages of PLC over computer control of processes. [16] Q11) How will you manage the process control design problem with reference to sequence of design steps, temporal hierarchy of control structure and integration? [16] [3864]-335 2 OR Q12) a) Explain control system for controlling feed flow rate, top product composition, bottom product composition of a two-product distillation column used to separate a binary mixture (A+B) where A is more volatile than B. [8] b) Explain the feedback and feedforward control strategies for controlling temperature of cold fluid exit stream from a counter-current shell and tube heat exchanger. [8] kbkb [3864]-335 3

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