Download GTU BE/B.Tech 2019 Summer 8th Sem New 2183607 Process Instrumentation Dynamics And Control Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VIII(NEW) EXAMINATION - SUMMER 2019
Subject Code:2183607
Subject Name:Process Instrumentation, Dynamics & Control
Time:10:30 AM TO 01:00 PM
Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q1 (a)
(b)

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(c)
Q2 (a)
(b)
(c)
(c)

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Q3 (a)
(b)
(c)
Q3 (a)
(b)

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Mention the following terms relating to control system
(1) set point tracking (i1) disturbance rejection (iii) block diagram
Write a short note on characteristics of laplace transform mentioning
it for input of unit step function .
Find the laplace transform of function x(t) that satisfies the

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differential equation and initial conditions
d3x _d*x dx
ac car
x(0) =1, x'(0) =0,x"(0) = -1
State and prove final value theorem.

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Write the systematic procedure for determining transfer function of a
process.
A thermometer exhibiting first order dynamics having a time constant
of 5 sec is at a steady state temperature of 25°C. At time t = 0 , the
thermometer is placed in a temperature’bath at 70 °C. Show that value

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of response reaches 63.2 % of its ultimate vale when time elapsed is
equal to one time constant.
OR
Derive the transfer function of first order system of mercury in
thermometer mentioning’assumptions involved.

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A control system is,subjected to a step change of magnitude 10. The
transfer function of'the control system is expressed as
6
G() = 5057+ 035 7 10
Calculate (i) overshoot (i1) Radian frequency (iii) Decay ratio

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Mention characteristic features of an underdamped second order
system for a step forcing function.
Derive the transfer function relating head to that of flow rate for liquid
level system connected in a noninteracting manner
OR

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A PI controller with integral time t1 1 min having a sensitivity Kc =
1. The error is subjected to a linear change of 3 °C/min. Obtain
response equation of controller.
Describe a second order system. Mention how the response in such a
system varies with variables characterizing the system.

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Derive the step response of an underdamped second order system.
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Date:15/05/2019
Total Marks: 70
MARKS

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Q4
Q4

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Q.5
Q.5
(a)
(b)
(c)

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(a)
(b)
(c)
(a)
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(c)
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(b)
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How stability is mentioned for linear systems?
For the case of a servo problem prove that an increase in controller
gain will reduce the value of offset.
Determine the transfer function Y(s)/X(s) for the system as shown in
the figure [—

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X +®—. Gy G, +® G, ¥

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OR

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Differentiate Servo problem and regulator problem.
Mention the rule for plotting root locus diagram for a negative
feedback system.
Obtain the response of a regulator problem for a change in load
variable.

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Mention various laws of thermoelectricity.
Write a short note on McLeod Vacuum gauge.
Describe various static and dynamic characteristics of measuring
instruments.
OR

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Write a short note on pressure measurement scales.
Describe the working of pressure spring thermometer.
With a neat diagram explain how venturimeter is used for measuring
flow deriving the equation for discharge.
Tkkd kbt d

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03
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07
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03
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07

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