Question Paper: Process Instrumentation Systems Question Paper - May 2015 - Instrumentation Engineering (Semester 6) - Mumbai University (MU)
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Process Instrumentation Systems - May 2015

MU Instrumentation Engineering (Semester 6)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any four:

1 (a) Compare feedback and feed-forward control system. 5 marks

1 (b) Explain terms (i) Control Recipe   (ii) Master recipe 5 marks

1 (c) Explain Process Reaction Curve method for tuning. 5 marks

1 (d) State features of PID controller. 5 marks

1 (e) Explain neutral zone and its significance in on-off controller. 5 marks

2 (a) Explain Cascade control with an example. Also comment on, which controller of the two (primary and secondary) should be factor with reasons. 5 marks

2 (b) Explain pneumatic PID controller. 5 marks

3 (a) For a temperature control system which inputs the controlled variables as a range from 0V to 4V. The output is a heater required to give 0V to 8V. A PID is to be used with kp=2.4%, k1=9%/% min & kD=0.7%/% min. The period of faster expected change is estimated to be 8 seconds. Develop the electronic PID circuit. 5 marks

3 (b) Draw different symbols used in physical ladder diagram for (i) Relays (ii) Motor (iii) Solenoid (iv) Lights (v) Switch
Develop Ladder logic for following system using physical ladder elements. Start and Stop are buttons used to Start and Stop system S1, S2 and R1 are solenoid valve and Relays.
S1 is used to fill the system (Tank) and R1 is used to Start Heater. LB is Level sensor when Level is reached, start heating liquid. When Temperature is reached (Ts=High) stop heating using R1 and open Solenoid valve S2.
:!MAGE-
5 marks

4 (a) Why safety is Required in Process Industry. Explain Selective control system for Boiler Protection. 5 marks

4 (b) Explain RGA method in detail. 5 marks

5 (a) Explain Self tuning Regulator for adaptive control. 5 marks

5 (b) Draw the plot of Three mode controller output for the error plot shown above. Assume Kp=5, K1=0.7 s-1, KD=0.5s and P1(0)-20%.
5 marks

Short notes on Any Two:

6 (a) Dead time and Smith Predictor Compensator. 5 marks

6 (b) Non-Interacting system. 5 marks

6 (c) Decoupler Design. 5 marks

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