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

PTU Punjab Technical University B-Tech May 2019 Question Papers 5th Semester Electronic and Communication Engineering (ECE-EIE)

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EIE) (2011 & Onwards) (Sem.?5)
PROCESS DYNAMICS AND CONTROL
Subject Code : EI-305
M.Code : 58023
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.

SECTION-A
1.
Answer briefly :

(a) What are the objectives of Automatic Process control?

(b) What is offset in a proportional controller?

(c) Define integral time.

(d) What is the effect of time delay in process control loop?

(e) What is the function of a control valve positioner?

(f) What are interacting systems in Process control?

(g) What do mean by tuning of a controller?

(h) What is need of mathematical modeling of process elements?

(i) Define turndown of a control valve.

(j) What are the drawbacks of the derivative control?
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SECTION B
2.
What do you mean by the action of a controller in a control loop? Differentiate between the
continuous and discontinuous mode of controllers.

3.
Discuss the various performance criterions used for the tuning of the controllers.

4.
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 :

(a) The relation between displacement level and current

(b) The neutral zone in meters
5.
Compare the characteristics of the proportional, integral and derivative mode of a
controller.
6.
Draw the construction and working of a hydraulic PI controller with a suitable diagram.

SECTION-C
7.
Derive & comment on the responses of a PID controller for a ramp, step and & impulse
error inputs.

8.
Discuss the construction and flow lift characteristics of the following types of control vales
used for the fluid control :

(a) Globe valves

(b) Butterfly valves

9.
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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