Anna University Process Instrumentation Dynamics & Control Exam Paper

Anna University Model Question Paper VI Semester B.TECH.

Chemical Engineering

Process Instrumentation Dynamics & Control


Time: 3hrs

Max Marks: 100

Answer all Questions

PART – A (10 x 2 = 20 Marks)

1. Name different types of forcing function and their graphical representation.

2. What is amplitude ratio and give the equation to calculate the same for sinusoidal response.

3. What do you mean by transportation lag and give an example.

4. Compare interacting and non-interacting systems.

5. Draw the graphical representation for phase and gain margins.

6. Explain the concept of stability.

7. What is (i) decay ratio, (ii) response time.

8. What is cross over frequency in stability criterion of Bode diagram.

9. List the applications of Mass spectrometer.

10. Name any two instruments used for moisture analysis.


PART – B (5 x 16 = 80 marks)

Question 11 is compulsory


11. Solve the following using Laplace transforms

i) 4 d2x/dt2 + g dx/dt + 2x=2 given x(0) =x'(0) =0                                    (8)

ii) dx/dt ={ 0?t X(t) dt} -1 given X(0) = 3.                                                  (8)


12.a) Write a transfer function for two first order identical systems connected in series in non-interacting manner and obtain the transient response for an unit step disturbance.



b) From the fundamentals develop a transfer function for a U-tube mercury manometer.


13.a)i)  Determine the stability by routh criterion (10)

ii) Explain the theorems of routh test and its limitations.                                   (6)




13.b) A proportional Controller is used to control two non-interacting first order system having time constant  and . Sketch the root locus diagram. Assume unity feedback control system.


14.a) Compare different types of control actions and explain in detail how they are selected.



b) Explain the dynamics and control of a shell and tube heat exchanger in detail.


15.a) Discuss the principle of measurement and classification of Process Control instrument with respect to.

i) Temperature

ii) Pressure

iii) Fluid flow and

iv) Composition                                                         (4 x 4 = 16 marks)



15.b)    Write notes on the following.

i) Density measurement of flowing fluids.                                (6)

ii) I-R Spectrometer.                                                                   (5)

iii) Ziegler – Nichols optimum controller settings.                       (5)


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