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1997 Course Process Instrumentation

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Total No. of Questions : 10] [Total No. of Pages : 2 [3664] - 52 P 1112 B.E. (Electronics Engg.) PROCESS INSTRUMENTATION (1997 Course) (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. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Define the term automatic control system. With suitable block diagram explain closed loop control system. [8] Define the term transducer. Explain in detail classification of transducer. [8] Explain the following terms related to thermocouple [8] i) Seebeck effect. ii) Peltier effect. iii) Thomson effect. iv) Thermopiles. Explain any one method for non contact type speed measurement. [8] Q3) a) b) Explain in detail variable area flowmeter. Explain any one method for pH measurement. [8] [8] Q4) a) b) With neat diagram explain V/F converter. [8] A strain gauge is bonded to a beam 0.1m. long & has a cross sectional area 4 cm2. Young s modulus for steel is 207 GN/m2. The strain gauge has an unstrained resistance of 240 & a gauge factor of 2.2. When a load is applied, the resistance of strain gauge changes by 0.013 . Calculate the change in length of steel beam & the amount of force applied to the beam. [8] P.T.O.

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