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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.

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