Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 5th Sem 2150504 Instrumentation And Process Control Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? V EXAMINATION ? SUMMER 2020
Subject Code: 2150504 Date:02/11/2020
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.
MARKS
Q.1 (a) Distinguish among step, exponential, sine and ramp forcing
03
functions.
(b) Discuss the comprehensive comparison of time constant of first
04
order systems: Mercury thermometer, liquid leven in single
tank & mixing process.
(c) Prove that "Response of Noninteracting tanks always result in
07
an overdamped or critically damped second-order system and
never in an underdamped system"
Q.2 (a) Compare the step response and nature of roots of second order
03
system.
(b) With Inversion by partial fractions prove that
04
dX + X = 1
dt
(c) A step change of magnitude 4 is introduced into a system
07
having the transfer function
Y(s)
10
=
X(s)
S2 + 1.6S + 4
Determine
(a) Percent overshoot
(b) Rise time
(c) Maximum value of Y(t)
(d) Ultimate value of Y(t)
(e)
Period of oscillation
OR
(c) A thermometer having a time constant of 0.2 min is placed in a
07
temperature bath, and after the thermometer comes to
equilibrium with the bath, the temperature of the bath is
increased linearly with time at a rate of 1o/min. What is the
difference between the indicated temperature and the bath
temperature
(a) 0.1 min
(b) 1.0 min after the change in temperature begins?
Q.3 (a) Discuss the rules for convert close loop block diagram into
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single transfer function.
(b) Derive the transfer function of distance velocity lag.
04
1
(c) Derive the transfer function of second order U tube manometer
07
& step response for critically damped.
OR
Q.3 (a) Differentiate between Negative Feedback and Positive
03
Feedback with suitable examples of each.
(b) Differentiate between Servomechanism type problem and
04
Regulator problem.
(c) Determine the transfer function Y(s)/X(s) for the block
07
diagram shown in Fig.
Q.4 (a) Derive the transfer function of PI control.
03
(b) Discuss the advantages and disadvantages for P, PI & PID
04
control for feedback control system.
(c) The open loop transfer function of a certain control system is
07
defined as
Kc
G(s) =
s
s
(s + 1) [(2) + 1] [(3) + 1]
Determine the value of Kc for which the control system is
stable by using Routh test for stability. And For the value of Kc
for which the system is on the threshold of instability,
determine the roots of the characteristic equation with the help
of routh test theorem 3.
OR
Q.4 (a) Derive the transfer function of PID control.
03
(b) Explain linear system versus non-linear system.
04
(c) Explain Nyquist stability criteria.
07
Q.5 (a) Discuss the principal of measurement in Bimetallic
03
Thermometer.
(b) Discuss the various elements of an Instrument.
04
(c) Ex
plain the principal, construction and working of radiation
07
pyrometer.
OR
Q.5 (a) Discuss the principal of liquid level measurement in bubbler
03
system.
(b) Discuss the various types of pressure springs which used in
04
thermometer.
(c) Explain the principal, construction and working of bellows
07
differential-pressure gauge.
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This post was last modified on 04 March 2021