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Posted Date: 18 Mar 2009 Posted By: Sunil Reddy Member Level: Platinum
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2008 Jawaharlal Nehru Technological University Chemical engineering Code No: R05 III B.Tech II Semester Supplimentary Examinations, Apr/May 2008 PROCESS DYNAMICS AND CONTROL Question paper
Code No: RR320803 Set No. 3
III B.Tech II Semester Supplimentary Examinations, Apr/May 2008
PROCESS DYNAMICS AND CONTROL
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Derive an expression for the dynamic response of a general first order system
for ramp change in input.
(b) A mercury thermometer having first order dynamics with a time constant of 60
sec is placed in a temperature batch of 400 C. After the thermometer reaches
its steady state, it is suddenly placed in a bath at 350 C at time t=0. Calculate
the variation of temperature with time for a period of 60 sec considering an
incremental time of 10 sec. [8+8]
2. Two non-interacting tanks are connected in series. The transfer function relating
the level, h2 in the second tank to the inflow, q to the first tank is given by the
following transfer function,
H2(s)
Q(s)
=
R2
(t1s + 1)(t2s + 1)
The time constants are t1=0.5 seconds and t2=1 seconds, and the resistance to out
flow R2 = 1. Sketch the response of the level in tank 2 if a unit step change is made
in inlet flow rate to tank 1. [16]
3. A first order process is controlled by a PD controller. The control valve is assumed
to be a first order. Assuming the measuring element is having negligible time
constant, develop a block diagram for the feedback control system and obtain an
overall transfer function. [16]
4. (a) Develop the block diagram of a generalized feed back control system with one
disturbance, incorporating in each block the appropriate transfer function and
on each stream the appropriate variable. [8]
(b) Develop the closed loop responses for set point and load changes. [4+4]
5. (a) Discuss the theorems of the Routh test
(b) For characteristic equation s4 + 6s3 + 11s2 + 36s + 120 = 0, determine the
stability using Routh Criterion. [8+8]
6. (a) Explain the concept of Root Locus.
(b) Explain the procedure of plotting root locus diagram. State also the rules.
[8+8]
7. Describe the method of control system design by frequency response method. Ex-
plain how it helps the designer.
8. (a) Compare and contrast negative feedback with positive feedback.
(b) Compare double seated and single seated control valve
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