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B.Tech II Semester Examinations,December 2011-2012
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1. (a) What is cascade control Scheme? Explain the same with the help of a neat
sketch?
(b) With suitable example, expalin the advantage of cascade control system.[8+8]
2. Explain the following:
(a) Advantages of PLCs.
(b) Advantages of DCS. [8+8]
3. (a) A discrete system is having the following transfer function,
T(Z) = (Z2 +4Z+3)/ (Z3+3Z2+2Z)
Obtain the discrete state model and discuss about its controllability and ob-
servability
(b) Give the structure of a self tuning regulator(STR) and explain how the con-
troller parameters are set [8+8]
4. (a) Discuss the functional requirements of Industrial Automation?
(b) Discuss the current trends in automation of Industrial Processes? [6+10]
5. Explain the design procedure of static feed forward controller with suitable example.
[16]
6. What is Smith Predictor (SP) algorithm? Why and when is this technique used.
Explain with a block diagram. [3+4+9]
7. (a) Describe the principle of a `Smart Transmitter. What and where does it trans-
mit discus some aspects of its development in recent years?
(b) Draw a block diagram to show how sensors interact with the automated man-
ufacturing process? Consider your own example. [8+8]
8. (a) What are the limitations of Z transforms? Dene modied Z transform and
obtain modied Z transform for G(S) = 1/(S+1)
(b) Write a short notes on Zero order Hold (ZOH) device. Also derive its transfer
function.
1. Expalin any two types of feed forward controller (FFC) algorithms. [8+8]
2. (a) Discuss about the basic elements of computer controlled process
(b) List out the various steps involved in design of digital computer control loops.
[8+8]
3. Write short notes on the following:
(a) Features of DCS.
(b) Features of PLC. [8+8]
4. (a) What is Dead Beat Algorithm? Explain DB algorithm for a second order
system considering Dead time?
(b) What is the eect of sampling on the response of a closed loop system? How
do you select the sampling rate? [10+6]
5. (a) What can be said about Controllability and Observability conditions if the
transfer function has a pole Zero cancellation?
(b) Find the controllability of the following system using KALMAN's Test: [8+8]
0
BB@
X1(K + 1)
X2(K + 1)
X3(K + 1)
1
CCA
=
0
BB@
0 1 0
0 0 1
?6 ? 11 ? 6
1
CCA
0
BB@
X1(K)
X2(K)
X3(K)
1
CCA
+
0
BB@
0
0
1
1
CCA
U(K)
6. Discuss with a neat sketch the functional operation of fuzzy based control. [16]
7. What is cascade control system? When the cascade control system is used in process
control applications? Explain with an example. [4+4+8]
8. (a) Explain how data bus works in a DCS.
(b) Discuss in brief about Intelligent eld bus device (IFD)?
1. (a) With neat block diagram, discuss in brief about SCADA.
(b) Draw the functional block diagram of Computer Control system and explain
the importance of each block in it? [8+8]
2. Explain the following types of cascade control systems.
(a) Series cascade control system.
(b) Parallel cascade control system. [8+8]
3. Write short notes on the following:
(a) Optimal control.
(b) Inferential Control. [8+8]
4. (a) Discuss about dierent communication protocols associated with Smart Sen-
sors?
(b) Write the advantages of Smart Sensors. [8+8]
5. (a) Explain the rst order modelling of processes without delay and with pure
delay. Also obtain the equation for nth sampled output.
(b) Discus brie
y about the desirable characteristics of digital control Algorithms.
[12+4]
6. (a) When and where a feed forward controller is used.
(b) Explain operation of FFC with suitable example. [6+10]
7. (a) What are the dierent programming methods used for programming PLCS.
(b) Develop a PLC program for operating Elavator using ladder diagram and
explain the same, with the help of a
ow chart. [4+12]
8. (a) What is meant by optimum controller settings? Describe the procedure to
controller settings that give minimum ISE.
(b) How is process reaction curve plotted? How do you use it for controller tuning?
What is process reaction curve methods (PRC) of controller tuning. Explain
how PRC method can be used to set the parameter of P, PI & PID Controllers?
1. Explain the architecture of a programmable logic controller (PLC) with a neat
diagram. [16]
2. (a) What is a multiple loop control system?
(b) What are the multiple loop predictive controller techniques that are popular
in process control applications. Explain. [6+10]
3. (a) Explain how Analog Process Control loops cab be replaced by digital computer
control loops?
(b) List out the advantages of DDC over conventional analog Controller [8+8]
4. (a) What is Dahlin's Algorithm? Explain Dahlin`s Algorithm for a rst order
system without delay.
(b) Give the design steps of discrete controller based on dierent algorithms.
[10+6]
5. Write short notes on:
(a) Field Bus systems
(b) Topology of Field Bus [8+8]
6. (a) Given the digital control system
U(K+1) = A X(K) + B U(K)
C(K) = D X(K)
Prove that if pair [A, D] is observable, then the closed loop realized by output
feed back U(K) = -G C(K) + r(K) is also observable.
(b) Describe the relationship among controllability, observability and transfer
function.
[10+6]
7. Explain the design procedure of dynamic feed forward controller with an example.
[16]
8. Draw a block diagram for Smith predictor control system. In each block that
involves controller calculations, show the equation solved in the digital implemen-
tation. Assume that an adequate process model is of rst order with dead time