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2003 Course Process Dynamics & Control

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Total No. of Questions : 12] [Total No. of Pages : 6 [3864] - 321 P 1088 B.E. (Chemical) PROCESS DYNAMICS & CONTROL (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate answer 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) b) i) With neat sketch explain feedback control strategy for controlling temperature of liquid inside a steam-heated stirred-tank heater by manipulating flow rate of steam. Identify CV, MV, DV for this system. [8] ii) If a direct-acting controller is used, whether you will select a airto-open or air-to-close type control valve on steam line. [2] With reference to the control system described in Q.1-a, explain the objectives of the control system. [8] OR Q2) a) b) Q3) a) Explain mathematical languages (methods) used for analysis and design of control systems in China, Russia, England, Greece and German. Also state the types of mathematical models used for analysis as the outcome of these languages. [8] For a stirred-tank heater system explained in Q.1-a, sketch and explain the following i) The control system for controlling level of liquid inside the tank by manipulating the flow rate of exit liquid stream. ii) The control system for controlling flow rate of liquid entering the tank. [10] A cylindrical liquid tank has 1 m2 cross-sectional area with a control valve with resistance 10 min/m2 installed in the liquid outlet line. Liquid enters into the tank at a rate 0.2 m3/min. [8] P.T.O.

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