Download GTU BE/B.Tech 2019 Winter 5th Sem New 2151705 Process Control Systems Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019

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Subject Code: 2151705 Date: 04/12/2019
Subject 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.

MARKS

Q.1 (a) What are the performance criterions to design a control system? 03
(b) Explain in brief the interacting and non-interacting processes with example. 04

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(c) Give out the guidelines for digital implementation of a PID controller in detail. 07

Q.2 (a) Draw and explain the step response of a PI controller. 03
(b) What causes inverse response? Explain with mathematical arguments. 04
(c) What is discrete time control? Explain ZOH and sampling concept for discrete time control. 07

OR

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(c) Explain two position controller with suitable waveform. Show the effect of neutral zone on controller output. 07

Q.3 (a) What is self-regulation? Explain with an example. 03
(b) Explain the terms: 1) Dead Time 2) Offset Error. 04
(c) For a unity feedback system, process transfer function is given by G(s)=1/s(s+1)(s+5). The controller is of PID mode. Calculate the optimal values of controller parameter based on ultimate cycle method of tuning: 07

OR

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Q.3 (a) What do you mean by velocity and position algorithm for PID controller implementation? 03
(b) Explain Time Proportional Control with suitable waveform. 04
(c) A certain thermometer has a time constant of 15 s and initial temperature of To= 25°C. It is suddenly exposed to a temperature of 100°C. Determine the rise time i.e. time required to attain 95% of steady state value and the temperature at this time. 07

Q.4 (a) Explain open loop ZN tuning method of the PID controller 03
(b) What is offset in case of proportional control action? How offset can be eliminated? 04

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(c) What is adaptive control? Explain gain scheduling in the context of adaptive control with suitable diagram. 07

OR

Q.4 (a) Explain ratio control with suitable example. 03
(b) What are the limitations of cascade control strategy? Discuss on tuning rule for the same. 04

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Q.5 (a) Explain the split range control for reactor pressure control. 03
(b) What is integrator windup? State and explain the ways to deal with the same. 04
(c) Explain selective control scheme with suitable diagram. 07

OR

Q.5 (a) How to derive the parameters of FOPDT model from Process Reaction Curve. 03

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(b) Explain Multi-position controller function with error Vs. controller output relation. 04
(c) Explain shrinking and swelling concept in the context of drum boiler control. 07