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2003 Course Computer Aided Process Control (Elective II)

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Total No. of Questions : 12] P1213 [Total No. of Pages : 3 [3664]-286 B.E. (Chemical) COMPUTER-AIDED PROCESS CONTROL (2003 Course) (Elective - II) (Sem. - 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) Distinguish between control strategies used for controlling batch and continuous processes. [6] b) Explain functions of HMI in computer control of processes. [6] c) Distinguish between DDC & DCS control systems. [6] OR Q2) a) Explain hierarchial computer control systems. [6] b) State advantages of using digital computer in process control. [6] c) Draw and explain block diagram of computer-aided process control system. [6] Q3) a) Explain state-space model of MIMO systems. Define controllability and observability of MIMO systems and state conditions for testing them. [8] b) Draw block diagram of 2 2 process and derive closed-loop transfer function for this system. Also derive relation between transfer function and state-space matrices. [8] OR P.T.O. Q4) a) Derive the expression for RGA for a 2 2 process modeled as [6] y1 (s) = k 11 m1 (s) + k12 m 2 (s) y 2 (s) = k 21 m1 (s) + k 22 m 2 (s) . b) A 3 3 process has state - space matrices [10] 6 18 6 2 A= 2 3 1 , B = 3 , C = [ 3 1]. 1 4 8 3 7 Q5) a) What are hold elements in digital control systems? Explain construction of ZOH & FOH elements and justify their working mathematically. [8] b) Derive discrete - time model of digital PID - controller in position and velocity form. Compare their performances. [8] OR Q6) a) Find inverse z-transform of the function 0.39 z 1 y( z ) = (1 z 1 )(1 0.61z 1 ) using partial fraction method. Comment on stability of this system.[8] b) Explain discretization of continuous - time signals from continuous signals. [8] SECTION - II Q7) a) Describe various types of analog interfaces used in computer control system. [6] b) Describe data transfer techniques used in computer control systems. [6] c) State different parts of process control software. OR [3664]-286 2 [6] Q8) a) b) c) Q9) a) b) Describe communication hierarchy in computer - aided process control. [6] Explain various layers used in networking of process control systems. [6] Starting from difference equation model, derive z-domain transfer function of first - order discrete - time systems. [6] Explain the essential components of DCS systems. Explain PLC architecture. [8] [8] OR Q10)a) b) Describe supervisory control functions. Describe I/O systems and modules used in PLC. [8] [8] Q11)a) b) Explain temporal hierarchy of control structure. Explain sequence of steps followed in process control design. [8] [8] OR Q12)a) b) Describe MIMO control system for heat exchanger. [8] Describe control schemes for fired heaters, pumps and compressors. [8] vvvv [3664]-286 3

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