GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2171710 Date: 03/12/2019
Subject Name: Process Dynamics and Control
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Briefly explain shrinking and swelling effects in boiler. 03
(b) Derive mathematical model for first order system. 04
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(c) Explain the unit operations used in food and pharmaceutical Industries with suitable process flow diagram. 07
Q.2 (a) Explain column pressure control in distillation column 03
(b) Explain measurement lag. Narrate various installation techniques of thermocouple in well. 04
(c) Explain three element control strategy for boiler. Discuss its advantages over single and two element control strategies. 07
OR
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(c) Explain dynamic response of heat exchanger to change in steam temperature 07
Q.3 (a) Derive mathematical model for thermocouple without thermo well. 03
(b) Enlist two major importance of burner management system. Explain burner management system for boilers. 04
(c) What is frequency response for distillation column? Explain importance of it with necessary equations. 07
OR
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Q.3 (a) What is inverse response? Explain with reference to boiler. 03
(b) Compare batch, continuous and packed-bed reactors. 04
(c) Discuss different control schemes for heat exchanger. 07
Q.4 (a) Compare batch process and continuous process with its applications. 03
(b) Write short note on sequential control in batch process 04
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(c) Discuss different design aspects for waste water treatment plant 07
OR
Q.4 (a) Write a brief note on countercurrent exchangers. 03
(b) Explain dynamic behavior of second order linear system. 04
(c) Explain the unit operations of fertilizer industry with suitable process flow diagram 07
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Q.5 (a) Discuss pH control for chemical reactors in brief. 03
(b) Discuss mass and energy balance in distillation column with necessary equation. 04
(c) Discuss various direct and indirect methods of controlling overhead composition in a distillation column. 07
OR
Q.5 (a) Explain system identification with one example. 03
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(b) Draw and explain diagram of feed forward control of feed water in boiler. 04
(c) Explain basic flow chart of unit operations of paper industries. 07
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