Gujarat Technological UniversityWinter 2023 examination

GTU 3150504 Instrumentation and Process Control Winter 2023 Question Paper & PDF

B.E. · Chemical Engineering · Semester 5 · Subject code 3150504
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Define Time Constant.
(b)
4 marks
Discuss the importance of process control in industry.
(c)
7 marks
Solve following differential equation using Laplace Transform: d2xdt2+4dxdt+3x=1\dfrac{d^2x}{dt^2} + 4\dfrac{dx}{dt} + 3x = 1, given x(0)=x′(0)=0x(0) = x'(0) = 0

Q.2

14 Marks
(a)
3 marks
Give the Laplace Transform of following functions: (i) e−2tsin⁡te^{-2t}\sin t (ii) δ(t)\delta(t) (iii) t2ett^2 e^t
(b)
4 marks
Explain the significance of deviation variables.
(c)
7 marks

Derive transfer function for a mercury in glass thermometer. What is the value of process gain for the mercury in glass thermometer?

(c)
7 marks
A thermometer with time constant 10 sec showing a steady temperature 35°C is suddenly immersed in heated oil bath at 200°C. Find: (i) Time required for temperature reading of 150°C. (ii) Temperature reading on the thermometer after 25 sec.

Q.3

14 Marks
(a)
3 marks
Define a first order system.
(b)
4 marks
Explain negative and positive feedback control systems
(c)
7 marks

Explain the merits and demerits of Proportional, Integral and Derivative action in a feedback controller.

(a)
3 marks
What is open loop control system?
(b)
4 marks
Discuss the significance of the damping coefficient.
(c)
7 marks
Discuss the characteristics of an underdamped second order response.

Q.4

14 Marks
(a)
3 marks
What is controller gain?
(b)
4 marks
Explain gain margin and phase margin.
(c)
7 marks

Obtain the overall transfer function of a servo mechanism negative feedback control system.

(a)
3 marks
Define stability for a control system.
(b)
4 marks
Explain controller tuning using Ziegler-Nichols method
(c)
7 marks
Determine the stability of the control system having the open loop transfer function:

G(s)=Kcs(s+1)(s+2)G(s) = \frac{K_c}{s(s+1)(s+2)}

Q.5

14 Marks
(a)
3 marks
Define: Drift, hysteresis and speed of response
(b)
4 marks
Explain advantages and disadvantages of Distributed Control System.
(c)
7 marks
Describe the principle, construction and working of optical pyrometer.
(a)
3 marks
Define: Accuracy, precision and reproducibility
(b)
4 marks
Explain SCADA system
(c)
7 marks

Describe the principle, construction working and applications of the bourdon tube pressure gauge.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Instrumentation and Process Control (Winter 2023, B.E. · Chemical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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