Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2150504 Instrumentation And Process Control Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150504 Date: 21/11/2019
Subject Name: Instrumentation & Process Control
Time: 10:30 AM TO 01:00 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) Give Laplace transform for 1) u(t) 2) e
-at
u(t) 3) cos kt u(t) 03
(b) Solve
????
????
+ 2?? = 2 given x (0) = 0.
04
(c) Explain: 1) Set point 2) Controlled Variable 3) Manipulated Variable
4) Offset 5) Positive feedback 6) Error 7) Disturbances
07
Q.2 (a) State the assumption used to derive the transform function for first
order CSTR with first order reaction.
03
(b) Place the following transfer function in standard first-order form, and
identify the time constant and the steady state gain using unit step input.
?? (?? )
?? (?? )
=
2
?? + 1/3
04
(c) A mercury thermometer having a time constant of 0.1 min is placed in
a temperature bath at 100?F and allowed to come to equilibrium with
the bath. At time t = 0, the temperature of the bath begins to vary
sinusoidally about its average temperature of 100 F with an amplitude
of 2 F. If the frequency of oscillation is 10/ ? cycles/min, plot the
ultimate response of the thermometer reading as a function of time.
What is the phase lag?
07
OR
(c) Derive the transfer function for the first order liquid level system. 07
Q.3 (a) Write the significance of Damping co efficient. 03
(b) Differentiate between interacting and non-interacting system. 04
(c) A step change of magnitude 4 is introduced into a system having the
transfer function
?? (?? )
?? (?? )
=
????
1.5?? ?? + 2.4 ?? + 6
Determine
(a) Percent overshoot
(b) Rise time
(c) Period of oscillation
(d) Natural period of oscillation
07
OR
Q.3 (a) Write in brief about ON / OFF control. 03
(b) Write in detail about double seated control valve. 04
(c) Discuss Servo and Regulatory problems in control system. 07
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150504 Date: 21/11/2019
Subject Name: Instrumentation & Process Control
Time: 10:30 AM TO 01:00 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) Give Laplace transform for 1) u(t) 2) e
-at
u(t) 3) cos kt u(t) 03
(b) Solve
????
????
+ 2?? = 2 given x (0) = 0.
04
(c) Explain: 1) Set point 2) Controlled Variable 3) Manipulated Variable
4) Offset 5) Positive feedback 6) Error 7) Disturbances
07
Q.2 (a) State the assumption used to derive the transform function for first
order CSTR with first order reaction.
03
(b) Place the following transfer function in standard first-order form, and
identify the time constant and the steady state gain using unit step input.
?? (?? )
?? (?? )
=
2
?? + 1/3
04
(c) A mercury thermometer having a time constant of 0.1 min is placed in
a temperature bath at 100?F and allowed to come to equilibrium with
the bath. At time t = 0, the temperature of the bath begins to vary
sinusoidally about its average temperature of 100 F with an amplitude
of 2 F. If the frequency of oscillation is 10/ ? cycles/min, plot the
ultimate response of the thermometer reading as a function of time.
What is the phase lag?
07
OR
(c) Derive the transfer function for the first order liquid level system. 07
Q.3 (a) Write the significance of Damping co efficient. 03
(b) Differentiate between interacting and non-interacting system. 04
(c) A step change of magnitude 4 is introduced into a system having the
transfer function
?? (?? )
?? (?? )
=
????
1.5?? ?? + 2.4 ?? + 6
Determine
(a) Percent overshoot
(b) Rise time
(c) Period of oscillation
(d) Natural period of oscillation
07
OR
Q.3 (a) Write in brief about ON / OFF control. 03
(b) Write in detail about double seated control valve. 04
(c) Discuss Servo and Regulatory problems in control system. 07
Q.4 (a) Draw P and I diagram symbols for Pneumatic, Electrical and Software
signals.
03
(b) Define: Dead zone, Drift, Precision, Dead time lag 04
(c) Discuss construction and working of Orifice meter. 07
OR
Q.4 (a) Explain Seeback effect of thermocouple. 03
(b) Describe about Absolute scale and Vacuum scale for pressure
measurement.
04
(c) Discuss Phase margin and Gain margin using stability criteria for
Bode diagram.
07
Q.5 (a) List various direct methods for level measurement. 03
(b) Discuss working of Rotameter. 04
(c) Write the characteristic equation and construct the Routh array for the
control system shown in fig. Is the system stable for Kc = 9.5?
07
OR
Q.5 (a) Discuss sight glass method for level measurement. 03
(b) Discuss working of U tube manometer. 04
(c) Write in brief about Radiation Pyrometer. 07
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This post was last modified on 20 February 2020