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2003 Course Process Instrumentation - I

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Total No. of Questions : 12] P1077 [Total No. of Pages : 3 [3864] - 281 B.E. (Instrumentation and Control) PROCESS INSTRUMENTATION - I (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates: 1) Answer three questions from section I and three 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) List input data necessary for design, selection and sizing of Control Valve and output data of the same. [8] b) A control valve is used for regulating the liquid flow from a tank. The water level is to be controlled in this tank at a height of 25 feet by regulating the outflow. The measured inflow varies from 0 to 120 gallons per minute. Calculate the Cv and suggest a suitable valve for this application. Instead of the valve discharging to the atmosphere, if it discharges into a second tank with a head of 15 feet and the maximum flow through is 120 gpm. Calculate the Cv and suggest a suitable valve for this application. [8] OR Q2) Explain the sources of noise in a control valve. Draw the setup to measure the noise in a control valve. Differentiate between the source treatment and path treatment for reducing the control valve noise. [16] P.T.O. Q3) a) Derive an expression for finding time constant of a level control system. [9] b) Two fluids are blended in a pipeline 20 ft. Upstream of where the mixture is sampled. The pipe contains 0.4 gal, per foot of length and the flow rate of the blend varies from 10 to 80 gpm. Dead time in the sample to analyzer is 15s. A circulating pump is installed to maintain 100 gpm flow through this 20 ft section of pipe without affecting the throughput. Compare the natural period with and without the pump operation. [9] OR Q4) Explain the following: a) Dead time b) Dead zone c) Dead band d) [18] Time constant Q5) a) What are the advantages and disadvantages of a Cascade Control? For [8] what kind of processes the Cascade Control is employed? b) With a suitable application explain the working of a Feedback Control? What are its limitations? [8] Q6) a) b) OR Explain the use of Ratio Control with suitable example. [8] What is Split Range Control? Explain with reference to its applicability. [8] SECTION - II Q7) a) What are the various configurable parameters of SLPC? Explain the significance of each parameter indicating appropriate example. [9] b) What is the role of Scaling in Process Control? Explain the various steps involved for scaling in a Flow Ratio Control application. [9] OR Q8) What is the need of analyzing the Process Control Loops? Explain the procedure to test a Flow Control Loop. Derive mathematical equations to support your answer. Explain significance of the same. [18] [3864]-281 2 Q9) a) Clarify the following terms w.r.t. an Intelligent Controller. [8] i) Forward chaining. ii) Backward chaining. iii) Search Engine. iv) Heuristics. b) List various methods used for parameter estimation in an Adaptive Control. Also draw the block diagram of Model Reference Adaptive Controller. [8] OR Q10)a) With the help of a neat block diagram, explain the working of an Optimal Control. [8] b) Differentiate clearly between Adaptive Control and Self tuning Control method. [8] Q11)a) What is SPC? Explain its importance in process industry. In a process control application specify when not to use SPC with justification. [8] b) Explain the use of Fuzzy Logic in Process Control applications. [8] OR [16] Q12)Write short notes on: a) Model predictive Control. b) ANN based Control. jjj [3864]-281 3

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