Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 2150504 Instrumentation And Process Control Previous Question Paper
Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:2150504 Date:20/01/2021
Subject Name:Instrumentation & Process Control
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q-1
(a)
State and prove initial value theorem.
03
(b)
Define: 1. Set point 2. Phase margin 3. Manipulated variable 4. Overshoot 04
(c)
Derive the sinusoidal response for mercury thermometer. What is phase lag 07
and phase lead?
Q-2
(a)
Discuss and derive transfer function of Mixing process.
03
(b)
Define Unit pulse input function. Derive its transfer function.
04
(c)
Derive the transfer function for a system of two tanks in series in non 07
interacting manner.
Q.3
(a)
Discuss servo problem and regulator problem.
03
(b)
Explain the general block diagram of any feedback control system with 04
industrial example.
(c)
A control system having transfer function is expressed as
07
Y(s)
5
G(s) =
=
X(s)
2s2 + 2s + 1
The radian frequency for control system is 1.9 rad/min. the time constant is
0.5 min. Calculate (1) Overshoot (2) Cyclical frequency (3) Maximum value
of Y(t).
Q.4
(a)
Write a short note on transfer function of control valve.
03
(b)
Write in brief about PI controllers and its transfer function.
04
(c)
Determine the overall transfer function C(s)/R(s) for the system shown in 07
below figure.
Q.5
(a)
A pneumatic proportional controller is used to control temperature within the 03
range of 60 to 100 F. The controller is adjusted so that the output pressure
goes from 3 psi (Valve fully open) to 15 psi (Valve fully closed) as the
measured temperature goes for 71 to 75 F with the set point held constant.
Find the gain and the proportional band.
(b)
Discuss the characteristics of second order underdamped system.
04
(c)
Determine the stability of system whose characteristic equation is
07
G(s) = 2s5 + 3s4 + 2s3 + s2 + 2s + 2
Q.6
(a)
Explain the following static characteristics of an instrument.
03
1
1. Accuracy 2. Precision 3. Drift.
(b)
Define stability of system. Discuss the general stability criteria.
04
(c)
What is bode diagram? Explain bode diagram for first order system.
07
Q.7
(a)
Explain in short the air trap method for level measurement.
03
(b)
Discuss the pitot tube for flow measurement.
04
(c)
Give the classification for various temperature measurement instruments. 07
Explain Bimetallic thermometer with neat sketch.
Q.8
(a)
Write a short note on temperature measurement by thermistor.
03
(b)
Explain working of optical pyrometer with schematic.
04
(c)
Explain the following pressure measurement instruments:
07
1. Inclined leg manometer 2. Capsule pressure gauge
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This post was last modified on 04 March 2021