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1997 Course Process Instrumentation (Elective I)

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Total No. of Questions : 8] [Total No. of Pages : 2 P1098 [3864] - 371 B.E. (Electronics Engg.) PROCESS INSTRUMENTATION (1997 Course) (Elective - I) (404205) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 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. SECTION - I Q1) a) With suitable examples explain open loop and closed loop control system. [8] b) Define the term transducer. With suitable examples give classification of transducers. [8] Q2) a) Define the term vacuum. Explain any one technique to measure vacuum pressure. [8] b) What is meant by LVDT? Explain in detail the application of LVDT for displacement measurement. [8] Q3) a) List the different continuous controllers. Explain proportional controller in detail. [8] b) Explain in detail op-amp based proportional + derivative controller. [8] Q4) a) Explain in detail the principle and working of flapper NOZZLE system in detail. Obtain its transfer function. [8] b) Compare electronic, pneumatic & hydraulic systems. [8] P.T.O. Q5) Write a short note on (any three): a) V/I converter. b) pH Measurement. c) Hydraulic PI controller. d) [18] Tuning of PID controller. SECTION - II Q6) a) Explain the following terms related to PLC: [8] i) Scan time. ii) PLC ladder diagram. iii) On delay and off delay timer. b) With suitable assumptions draw the ladder diagram for elevator system. [8] Q7) a) What do you understand by the term interlocks. Explain any two interlocks for boilers with its operation. [8] b) List the different types of boilers. Explain three element drum level control in boiler. [8] Q8) a) Explain adaptive control system in detail. [8] b) Explain the following terms related to control valve. i) Valve coefficient. ii) Rangeability. iii) Cavitation. iv) Turn down. [8] Q9) a) Explain in detail supervisory control system. [8] b) Explain in detail instrument control panel. [8] Q10)Write a short notes on (any three): [18] a) Dryer controls. b) Actuators. c) Distillation column controls. d) Two wire transmitters. jjj [3864]-45 2

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