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2003 Course Process Instrumentation - I

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Total No. of Questions : 12] P1163 [Total No. of Pages : 3 [3664]-243 B.E. (Instrumentation & Control) PROCESS INSTRUMENTATION - I (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer three questions from section I and three questions from section II. Answers to the two sections should be written in 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) State various factors considered in ISA 75.02 for testing capacity of a control valve. Explain any two factors in detail. [8] b) A control valve regulates liquid flow from a tank. The water level is to be controlled in this tank at a level of 25 feet by regulating the outflow. The measured inflow varies from 0 to 120 gallons per minute. Calculate CV and suggest a suitable valve for this application. Instead of the valve discharging to atmosphere, if it discharges into a second tank with head of 15 feet. The maximum flow through is 120 gpm. Calculate CV and suggest a suitable valve for this application. [8] OR Q2) a) Describe the terms Cavitation and Flashing w.r.t. control valves. State giving reasons whether the following statement is true or otherwise. Flashing is more hazardous than Cavitation . [8] b) Comment on valves used for high temperature and high pressure applications. [8] Q3) a) For the following processes select the PID settings with justification.[10] i) A process with dead time and multiple capacity. ii) A gas pressure control process with single capacity. P.T.O.

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