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2003 Course Process Instrumentation (Elective I)

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Total No. of Questions : 12] P1161 [Total No. of Pages : 3 [3664]-216 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) b) Draw the block diagram of a SMART TRANSMITTER with RTD as the input sensor. Explain the function of each block. [8] Using an RTD with temperature coefficient of resistance 0.0034/ C and R = 100 Ohms at 20 C, design a signal conditioning with bridge and Instrumentation amplifier to provide 0-5 V output for 20 C - 100 C temperature variation. The RTD dissipation constant is 28mW/ C.[8] OR Q2) a) b) Write the specifications of a digital conductivity meter. [6] Temperature is to be measured in the range of 250 C - 450 C with an accuracy of 2 C. The sensor is a resistance that varies linearly from 280 ohm to 1060 ohm for this temperature. Power dissipation in the sensor must be kept below 5 mW. Design a signal conditioning circuit that provides an voltage output of -5V to +5V for this temperature range. [10] Q3) a) Sketch the following types of control valve actuators. i) Spring diaphragm actuator with positioner. ii) Electropneumatic actuator. Explain Rate Before Reset PID controller. Where it is used? b) [10] [6] P.T.O. OR Q4) a) Explain open loop transient response method for controller tuning.[6] b) A liquid level system converts a 4 10m level into 4 20 mA current. Design a three mode controller that outputs 0 5 V with a 50% proportional band, 0.03 minute reset time and 0.05 minute derivative time. Fastest expected change time is 0.8 minute. [10] Q5) Draw the P & I diagram and explain the following control schemes. Write the specifications of the instruments used in each scheme : a) Three element control of boiler drum level. b) Cascade control of a multiple effect evaporator. [18] OR Q6) a) With a block diagram explain Self tuning controller . [6] b) What is Statistical Process Control ? How it differs from conventional process control strategies? [6] c) Draw the P & I diagram and write the specifications of the instruments used in the cascade control of a jacketed CSTR (Continuously Stirred [6] Tank Reactor) SECTION - II Q7) a) b) Explain the mathematical dynamic model of any temperature process. [10] Explain the term Feedforward optimizing control . [6] OR Q8) a) With suitable examples, explain the following terms : i) Model Predictive Control (MPC). ii) b) Internal Model Control. Explain different optimizing tools in process control. [3664]-216 [10] 2 [6] Q9) a) b) Write the sample specifications of a PLC having both analog and digital inputs as well as outputs. [6] Explain the following terms w.r.t. a PLC : i) c) I/O scan mode. ii) [4] Execution mode. Draw the physical ladder diagram for a motor with NO start switch, NC stop switch, thermal overload limit switch opening at high temperature, Green light when running and Red light for thermal overload. Convert it into a Programmed Ladder Diagram. [6] OR Q10)a) How the interpretation of NO and NC symbols differ in Relay ladder logic and PLC ladder logic. [4] b) Draw the event sequence and ladder diagram for a PLC system for a Conveyor System for Bottle Filling . Consider all sensors as direct inputs to PLC. [12] Q11)a) Draw the block diagram of a SCADA system and explain the function of each block. [10] b) Explain following terms w.r.t. a Distributed Control System (DCS):[8] i) Data highway configuration. ii) Star type configuration. iii) Ring type configuration. iv) Mesh type configuration. OR Q12)Write short notes on the following : a) Square root extractor. b) Control panel classification. c) Flow totaliser. vvvv [3664]-216 3 [18]

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