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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.

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