Download GTU B.Tech 2020 Winter 5th Sem 2151705 Process Control Systems Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 2151705 Process Control Systems Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:2151705 Date:03/02/2021
Subject Name:Process Control Systems
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.
Q.1 (a) Briefly discuss servo control and regulatory control problems.
03

(b) Define the terms: (1) manipulated variable (2) controlled variable (3) transfer
04
function (4) offset

(c) Explain linearization method for processes with nonlinear elements.
07



Q.2 (a) Write down mass balance equation for a single tank liquid level system.
03

(b) Differentiate between self regulating and non self regulating processes.
04

(c) Derive mathematical model of continuous stirred tank reactor.
07

Q.3 (a) What do you mean by the term `Dead Time'? What is its effect on the stability
03
of system?

(b) Derive and discuss unit step response of integrating process.
04

(c) Discuss in detail the process reaction curve method to obtain FOPDT model of a
07
process.




Q.4 (a) Draw and explain step response of PI controller.
03

(b) Briefly explain inverse response process with an example.
04

(c) Discuss two position control mode with suitable example. Discuss the
07
significance of neutral zone.



Q.5 (a) Discuss Zero Order Hold (ZOH) in the context of digital controller.
03

(b) Define the term `proportional band' with suitable example. Discuss its effect on
04
system stability.

(c) Discuss closed loop Zeigler Nichols tuning method of PID controller.
07



Q.6 (a) What is integral wind up?
03

(b) Explain any one anti wind up technique.
04

(c) With necessary circuit and equations, discuss the electronic design of PID
07
controller using operational amplifiers.



Q.7 (a) What is inferential control? Explain briefly.
03

(b) Explain adaptive control briefly.
04

(c) Discuss feed forward and feedback control schemes with suitable diagram and
07
their advantages and disadvantages.



Q.8 (a) Briefly explain selective control scheme.
03
(b) Discuss cascade control scheme with suitable diagram.
04
(c) With suitable diagram explain the control scheme for maintaining proper air to fuel ratio
07
for drum boilers.
*************
1

---