PTU B.Tech ECE 5th Semester May 2019 58023 PROCESS DYNAMICS AND CONTROL Question Papers

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Roll No. [ ] [T T T TT] Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EIE) (2011 & Onwards) (Sem.-5)
PROCESS DYNAMICS AND CONTROL

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INSTRUCTIONS TO CANDIDATES :

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1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Answer briefly :
   1. What are the objectives of Automatic Process control?

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   2. What is offset in a proportional controller?
   3. Define integral time.
   4. What is the effect of time delay in process control loop?
   5. What is the function of a control valve positioner?
   6. What are interacting systems in Process control?

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   7. What do mean by tuning of a controller?
   8. What is need of mathematical modeling of process elements?
   9. Define turndown of a control valve.
   10. What are the drawbacks of the derivative control?

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SECTION B

1. What do you mean by the action of a controller in a control loop? Differentiate between the continuous and discontinuous mode of controllers.
2. Discuss the various performance criterions used for the tuning of the controllers.
3. A liquid level control system linearly converts a displacement of 2 to 3 m into a 4-20mA control signal. A relay serves as the two position controller to open or close an inlet valve. The relay closes at 12 mA and opens at 10 mA. Find :
   1. The relation between displacement level and current
   2. The neutral zone in meters

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4. Compare the characteristics of the proportional, integral and derivative mode of a controller.
5. Draw the construction and working of a hydraulic PI controller with a suitable diagram.

SECTION-C

1. Derive & comment on the responses of a PID controller for a ramp, step and impulse error inputs.

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2. Discuss the construction and flow lift characteristics of the following types of control vales used for the fluid control :
   1. Globe valves
   2. Butterfly valves
3. Why there is a need of restriction in the flapper nozzle system? Explain the working of the pneumatic PID controller with neat sketches.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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