Pune University BE Chemical Process Dynamics and Control Question Papers

Pune University Previous Year Question Paper


(2008 Pattern) (Sem. – I)

Time :3 Hours]                                                                                             [Max. Marks :100

Instructions to the candidates:

1)            Answers to the two sections should be written in separate books.

2)            Neat diagrams must be drawn wherever necessary.

3)             Pigures to the right indicate full marks.

4)            Assume suitable data, if necessary.


QI) a) Discuss the incentives for Chemical process control.                   [8]

b) Derive the Input-output model for CSTR.                                                                                                             [8]


Q2) a) Derive the transfer function of single tank liquid level system. Draw a suitable sketch.                                          [8]

b) A thermometer showing steady state temperature of 30°C is suddenly immersed into a hot bath at 150°C. If the time constant of thermometer is 7 sec, determine the following :                       [8]

i)                 Thermometer reading after 7 sec.

ii)                Time required to read 90°C on Thermometer.

iii)               Time required for 90% response.

Q3) a) Derive the transfer function for damped vibrator. Comment on type of dynamic response of the system.                                                                                                                          [8]

b)               Discuss the characteristics of underdamped response and plot the graph of overshoot and decay ratio versus damping factor t.                                                                  [8]


Q4) a) Define P, I 8 D controller and derive their transfer functions. Discuss their open loop and closed response with neat diagrams.                                                                                          [8]


b) A second order process with following transfer function is controlled by P controller. Assuming servo problem and neglecting the dynamics of final control element and measuring instrument i.e Gf(5) = Gm(s) = I; The open loop process is Gp(s) 2 ^                                                              [8]

Determine the following :

i)              Closed loop transfer function.

ii)           Order of response.

iii)         Closed loop gain, time constant.

iv)         Offset.

Q5) a) Define stability of the process and discuss the Routh-Hurwitz criteria. [6]

b) Draw the root locus diagram for the system with following transfer function:   [IP]

Gp( s) – ——– 1——–s( s +1)( s + 2)


Q6) Define controller tuning and discuss the following tuning methods; [18]

a)         Time integral performance criteria.

b)        Reaction curve method.

c)        Ziegler Nichols method.


Q7) a) Sketch the Bode diagram for PD controller.                                                            [9]

b) Sketch the Nyquist diagram for PI controller.                                             [9]


Q8) a) Derive the response of general first order system to sinusoidal input.

Define amplitude and phage lag.                                                                        [9]

b) Discuss the following :                                                                                    [9]

i)             Dead Time system.

ii)           Nyquist stability criteria.

iii)         Gain margin 8 phase margin.

Q9) Draw a neat sketch and write short notes on :                                                             [16]

a)        Inverse Response system.

b)        Feed forward control 8 feedback control.



QI 0) Draw a neat sketch and discuss in detail about :                                                                                                                                                                                         [IT]

a)             Adaptive control.

b)             Inferential control.

QII) Draw the instrumentation diagram for Adiabatic plug flow reactor control and discuss in detail about its functioning.                                                                                     [16]


Q12) Write short notes on :                                                                                                                                                                                                                               [16]

a)             PLC 8 SCADA systems.

b)             Digital approximation of classical controllers.

c)             Data Bus concept.

d)            Role of digital computers in control.

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