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2003 & 1997 Course Process Instrumentation - II

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Total No. of Questions : 12] P1359 [Total No. of Pages : 4 [3764]-289 B.E. (Instrumentation & Control) PROCESS INSTRUMENTATION - II (1997 & 2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate answer books. 2) Figures to the right indicate full marks. 3) Neat diagrams must be drawn wherever necessary. 4) Assume suitable data, if necessary. SECTION - I Q1) a) With reference to spherical heat exchanger, explain given statement with neat instrumentation scheme: 'Feedback control by throttling coolant inlet is a nonlinear variable gain process'. [8] b) Draw a neat instrumentation scheme using a temperature flow cascade loop for steam-reboiler. Explain how it will be tuned? [8] OR Draw and explain simplified block diagram of a chiller unit. Clearly show all components along with flowing mediums. [8] Q2) a) b) Explain 'ON-OFF control' of small industrial refrigeration unit. How to increase its efficiency? [8] Q3) a) Does conversion equations and conversion versus temperature characteristics differ depending on type of reactor? Explain your answer with reference to plug flow and continuous stirred tank reactor. (No instrumentation scheme expected.) [8] b) For a chemical reactor process, which four interacting time lags are present? Show with a neat reactor diagram, with coolant inlet valve, a temperature controller and a circulation pump for coolant. [8] Q4) a) b) OR Write a short note on Reactor Safety. [8] Differentiate between Batch Reactor and continuous reactor control.[8] P.T.O. 1

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