GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2151705 Date:16/11/2018Subject Name:Process Control Systems
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Define term 03
1) Offset 2 ) dynamic error 3) Neutral Zone
(b) What are the performance criterions to design a control system? 04
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(c) Explain the Dynamic behaviour of the First and second order 07Processes
Q.2 (a) What is the neutral zone and its advantages 03
(b) What is discrete time control? 04
(c) Explain the concept of control mode. With suitable diagram and 07
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equations explain PID controller. OR
(c) A Liquid level control system linearly converts a displacement 07
of 2 to 3 meters in to 4 -20 mA control signal. A realy serves as
a two position controller to open or close an inlet valve. The
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relay closes at 12 mA and open at 10 mA find a) the relationbetween displacement and current b) the neutral zone
Q.3 (a) What is the mass balance equation -of simple liquid level 03
system
(b) How to convert nonlinearterm to linear and why? 04
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(c) What do you mean by tuning of controller? Explain Z-N method 07of tuning
OR
Q.3 (a) Define the terms 1)Range 2) Error 3) Manipulated Variable 03
(b) Explain Proportional controller with example 04
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(c) Draw and Explain various configurations of ratio control schemes 07 Q.4 (a) Whatisintegral windup? 03
(b) Explain the cascade control with example 04
(c) Develop the mathematical model of two tank series non 07
interacting system with mathematical calculation
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OR
Q.4 (a) Differeciate the Feed forward and Feedback with suitable 03
example
(b) Explain the Feedback control system 04
(c) Develop the mathematical model for CSTR system 07
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Q.5 (a) Whatis FOPTD model? Explain with process reaction curve 03
method.
(b) Explain three position controllers with example 04
(c) Show three element control of boiler drum level
OR
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Q.5 (a) Explain the split range control for reactor pressure control 03(b) Explain in detail the adaptive Control techniques 04
(c) What is degree of freedom? Explain it in the context of CSTH 07
with suitable equations and diagram.
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