Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2150504 Instrumentation And Process Control Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2150504 Date: 03/06/2019
Subject Name: Instrumentation & Process Control
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Why P mode controller creates offset? How can it be overcome? 03
(b) Define the following terms:
i. Overshoot
ii. Response time
iii. Rise time
iv. stability of the process
04
(c) A thermometer with time constant 10 sec showing a steady temperature of
35
o
C is suddenly immersed in heated oil bath at 200
o
C. Find:
i. Time required for temperature reading of 150
o
C.
ii. Temperature reading on the thermometer after 25 sec.
iii. The percentage response after 40 sec.
07
Q.2 (a) List out the assumptions for mercury thermometer as first order system
and justify them.
03
(b) Prove that the effect of feedback is to speed up the response of the control. 04
(c) Define second order system. Derive the transfer function of U-Tube
Manometer in which pressure P is acting in one limb and other limb is
open to the atmosphere.
07
OR
(c) For two interacting first order liquid level systems derive the transfer
function. Show the effect at outlet flow rate from second tank to step and
pulse input disturbance in flow to the first tank.
07
Q.3 (a) What is offset? Why it cannot be eliminated when P-controller is used? 03
(b) Explain transfer lag and transportation lag. 04
(c) The transfer function of the second order control system is given as,
A step change of magnitude 5 is given in the input variable. Determine,
1) Overshoot
2) Rise time
3) Period of oscillation
4) Maximum value of response
07
OR
Q.3 (a) Solve the following by using Laplace transforms:
; given x (0) = x?(0) = 0.
03
(b) Draw the block diagram for temperature control system of heated stirred
tank with proportional controller.
04
(c) What are Bode diagrams? Explain the graphical rules for Bode diagrams. 07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2150504 Date: 03/06/2019
Subject Name: Instrumentation & Process Control
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Why P mode controller creates offset? How can it be overcome? 03
(b) Define the following terms:
i. Overshoot
ii. Response time
iii. Rise time
iv. stability of the process
04
(c) A thermometer with time constant 10 sec showing a steady temperature of
35
o
C is suddenly immersed in heated oil bath at 200
o
C. Find:
i. Time required for temperature reading of 150
o
C.
ii. Temperature reading on the thermometer after 25 sec.
iii. The percentage response after 40 sec.
07
Q.2 (a) List out the assumptions for mercury thermometer as first order system
and justify them.
03
(b) Prove that the effect of feedback is to speed up the response of the control. 04
(c) Define second order system. Derive the transfer function of U-Tube
Manometer in which pressure P is acting in one limb and other limb is
open to the atmosphere.
07
OR
(c) For two interacting first order liquid level systems derive the transfer
function. Show the effect at outlet flow rate from second tank to step and
pulse input disturbance in flow to the first tank.
07
Q.3 (a) What is offset? Why it cannot be eliminated when P-controller is used? 03
(b) Explain transfer lag and transportation lag. 04
(c) The transfer function of the second order control system is given as,
A step change of magnitude 5 is given in the input variable. Determine,
1) Overshoot
2) Rise time
3) Period of oscillation
4) Maximum value of response
07
OR
Q.3 (a) Solve the following by using Laplace transforms:
; given x (0) = x?(0) = 0.
03
(b) Draw the block diagram for temperature control system of heated stirred
tank with proportional controller.
04
(c) What are Bode diagrams? Explain the graphical rules for Bode diagrams. 07
2
Q.4 (a) Prove that L { ? (t)} = 1 03
(b) Explain rules of Root-Locus diagram. 04
(c) A proportional derivative controller having the gain Kc and the derivative
time is 4 is used to controller two first order non-interacting systems
having time constant ?1=1 and ?2=0.5. If the gain of the process is 0.5.
Sketch the Root locus diagram for the control system. The transfer
function of the measuring element is 1/S.
07
OR
Q.4 (a) Explain Servo and Regulator control with suitable examples. 03
(b) What do you mean by open loop transfer function and closed loop transfer
function? Determine the transfer function Y(s) / X(s) for the following
block diagram.
04
(c) Determine the stability of the system having the open loop transfer
function given as,
Use Routh criterion. Determine the value of gain of the controller for
which the system just causes instability.
07
Q.5 (a) Define following terms:
i. Static error
ii. Drift
iii. Reproducibility
03
(b) Explain principle and working of venturimeter. 04
(c) Describe the bubbler system for liquid level measurement with neat
sketch.
07
OR
Q.5 (a) Mention various temperature measurement methods. 03
(b) Explain dynamic characteristics of an instrument. 04
(c) Describe the principle, construction and working of thermocouple used for
temperature measurement.
07
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This post was last modified on 20 February 2020