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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 Q5) a) Select proper option: [8] A) Radial flow centrifugal pumps are suitable for : ___________ . i) Clear liquids - low viscosity. ii) Clear liquids - high viscosity. iii) Thin slurries or suspensions. iv) Viscous or thick slurries and sludges. v) Raw sewage and heavy suspensions. vi) All i, ii, iii and iv. vii) None of these. B) Axial flow and mixed flow pumps are suitable for : _________ . (Select option from 'i' to 'v'). C) Reciprocating piston pumps are suitable for ___________ . i) 'i' only. ii) 'ii' only. iii) 'vi' iv) 'vii' D) Diaphragm pumps are suitable for ___________ . i) 'iii' only. ii) 'v' only. iii) 'vi' iv) 'vii' b) List four factors that may affect pump capacity. c) For given pump types, methods of controls are mentioned. You have to write pump types on right hand side: [6] Method of control Possible control type ON-OFF Throttling ON-OFF ___________ Throttling valve control ___________ Speed control ___________ Stroke adjustment ___________ Given pumps : Centrifugal, rotary, reciprocating. [3764]-289 2 -2- [4] Q6) a) b) c) OR Enlist different capacity control methods of compressors. [8] To detect surge in a compressor, which sensor / transmitter is used among following? [4] Why? Three options are as: Pneumatic transmitter or electronic d/p cell or diffused silicone d/p cell. Can we use closed loop ultimate oscillation method for tuning the controller in the surge control loop? Explain in brief 'tuning the controller for surge loop'. [6] SECTION - II Q7) Select proper option and rewrite the sentence: a) Load on a steam boiler refers to the amount of _______ demanded. i) Feed flow ii) Steam iii) Drum level b) iv) pH of feedwater The position of oxygen analyzer in a boiler is near _______ . i) Induced draft fan ii) Forced draft fan iii) Steam drum c) iv) Windbox The position of _______ is in stock path. i) Super heater headers ii) iii) FD fan d) [16] Vortex shedding meter iv) FW heater The reasons why dampers are undesirable as final control elements include their _______ . i) hysteresis ii) nonlinearity iii) leakage iv) all of the three e) The best method of controlling air flow is to eliminate the damper completely and throttle the fan itself. True or false? f) Use of orifice meter for steam and water at 10% of flow, is it recommanded or not recommanded? Coriolis mass flow meter is preferred for gaseous fuels. True or False? Attemperator is used to control _______ in a faster way. i) drum level ii) steam temperature g) h) iii) fuel flow [3764]-289 3 iv) air fuel ratio -3- Q8) a) b) OR Explain parallel closed loop control with air and fuel limiting. What is its advantage? Draw the instrumentation scheme required for the same. [8] Explain three element feedwater system with three alternatives. [8] Q9) a) Write a short note on 'Back propagation neural network used in continuous fractionating column'. [8] b) Draw a neat instrumentation scheme for 'method of distillation column automation through suboptimization control stage' and explain the same. [8] OR What are process complexities in Distillation Column Control System? How feed forward control takes care of such complexities; explain.[8] Q10)a) b) Explain composition control of two products of Binary Distillation Column Unit. [8] Q11)a) Obtain equations of steady state model of Double effect evaporator. Explain cascade control scheme used in multieffect evaporators. [10] b) [8] Write a short note on crystalizer control instrumentation. OR Q12)Write notes along with instrumentation (if required) schemes for: a) Spray Dryers. [6] b) Application of evaporators. [6] c) Turbo dryers. [6] [3764]-289 4 -4-

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