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2003 Course Process Instrumentation (Elective I)

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Total No. of Questions :12] P1072 [Total No. of Pages :3 [3864]-246 B.E. (Electronics) PROCESS INSTRUMENTATION (Elective-I)(2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate 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) With suitable example, distinguish between Servo Problem and Regulator Problem in Process Control. [6] b) Draw the block diagram of a SMART TRANSMITTER for Temperature measurement. Explain the function of each block. [10] OR Q2) a) Using an RTD with temperature coefficient of resistance 0.0039/ C, design a signal conditioning with bridge and Instrumentation amplifier to provide 0-5V output for a 20 C 100 C Temperature variation. The RTD dessipation constant is 28mw / C. [10] b) Explain any one optical method for the measurement of displacement.[6] Q3) a) Explain the following terms with reference to a control valve i) b) Cavitation. ii) Flashing. [6] [10] A liquid level system converts 4 10m level into 4 20mA Current. Design a three mode controller that outputs 0 5V with 50% PB, 0.03min Reset time and 0.05 min derivative time. Fastest expected time change is 0.8 min. P.T.O. OR Q4) a) Sketch the following control valves : i) ii) Butterfly valve. iv) Q5) a) Diaphragm valve iii) b) Double seated globe valve. Digital valve [12] In an application of the zeigler Nichols method for controller tuning a process begins oscillations with 30% proportional band with a period of 11.5 minutes. Find out the nominal PID settings. [4] With necessary block diagram, explain the following: i) ii) b) Q6) a) Programmed adaptive control. Self adaptive control. [10] With necessary P&I Diagram ,explain the feed forward control of a Heat Exchanger write the specifications of the Instruments used in this scheme. [8] OR With P&I Diagram explain : i) ii) b) Cascade control of Multiple effect evaporator. Cascade control of Distillation column temperature. Explain the term Statistical Process Control where it is applied? [12] [6] SECTION - II Q7) a) b) Explain the Mathematical model of any one temperature Process. [10] With suitable example explain Internal Model Control . [6] OR Q8) a) b) Explain Gradient Method for Constraint Handling. Explain different optimizing tools in Process Control. Q9) a) Distinguish between Relay ladder Diagram and PLC ladder diagram [4] [3864]-246 2 [8] [8] b) Draw the event sequence and ladder diagram for a PLC system for Elevator operation . Consider all sensors as direct inputs to the PLC. [12] OR Q10)a) b) Draw the event sequence and ladder diagram for a PLC system used as Alarm Annunciator . Consider all sensors as direct inputs to the PLC. [12] Explain the function of Input module and output module in PLCs [4] Q11)a) Draw the block diagram of a SCADA system and explain the function of each block. State two applications of such a system. [10] b) What is the function of a Square Root Extractor? How to implement the same using Electronic circuit ? Where it is used? [8] Q12)a) b) OR Draw the block diagram of a Distributed Control System (DCS). Explain the function of each block write the sample specifications of a DCS.[10] Write short notes on : i) Flow totaliser. ii) Classification of control Panels. [8] zzzz [3864] 246 3

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