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2003 Course Process Dynamics & Control

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Total No. of Questions : 12] P1441 [Total No. of Pages : 3 [3764]-321 B.E. (Chemical) PROCESS DYNAMICS & CONTROL (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) Answers to the two sections should be written on separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) Explain the basic needs that should be satisfied by a control system.[8] b) i) ii) Develope the feedback control system for controlling the temperature of liquid inside the stirred tank, which is heated by steam passing through a steam coil immersed in the liquid. Also develope feedforward control scheme for the said purpose based on temperature of liquid entering the tank. [10] OR Q2) a) With reference to CSTR example, explain the basic elements of feedback control used to control the temperature inside the reactor by manipulating the flow rate of jacket fluid. [10] b) State applications of Laplace transform, Z-transform, state-space methods, frequency response methods of analysis for process control systems. [8] Q3) a) Derive the transfer function model of a LTI system modeled by nth order linear differential equation. Define poles and zeros of the system. How will you predict the dynamic behaviour of the process based on the nature of poles and zeros qualitatively. [8] b) A liquid tank has a uniform cross-section area of 0.2 m2 and linear output resistance of 0.1 m2/min. Water enters the tank at a steady rate of 30 lit/ min. Find P.T.O.

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