Gujarat Technological UniversityWinter 2025 examination

GTU 3150504 Instrumentation and Process Control Winter 2025 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
Discuss advantages of automatic control of a process.
(b)
4 marks
Differentiate between Feedback and feed forward control system with example.
(c)
7 marks

Derive the transfer function of mercury thermometer. Determine the response equation of mercury thermometer for Ramp function.

Q.2

14 Marks
(a)
3 marks
State and prove translation of transform.
(b)
4 marks
d2xdt2+2dxdt+x=1\dfrac{d^2x}{dt^2} + 2\dfrac{dx}{dt} + x = 1, x(0)=x′(0)=0x(0) = x'(0) = 0. Solve the differential equation by Laplace transform
(c)
7 marks

Derive the transfer function of Manometer in which pressure P is acting in one limb and other limb is open to the atmosphere.

(c)
7 marks

Derive the transfer function for ‘loading’ system where second tank will be load by first tank.

Q.3

14 Marks
(a)
3 marks
Differentiate between interacting and non-interacting system
(b)
4 marks

Develop a transfer function relating the tank outlet temperature to changes in the inlet temperature considering mixed tank heater system

(c)
7 marks
For a second order transfer function with τ=1\tau = 1 and ζ=0.8\zeta = 0.8, being distributed with a sine wave input 3sin⁡(0.5t)3\sin(0.5t). Determine the form of the response after transient have decayed and steady state oscillations are established.
(a)
3 marks
Explain gain margin and phase margin.
(b)
4 marks
Differentiate between transfer lag and transportation lag.
(c)
7 marks
Discuss Bode plot for first order system

Q.4

14 Marks
(a)
3 marks
Discuss the Nyquist stability criteria.
(b)
4 marks
Write in brief about PD controllers and its transfer function
(c)
7 marks
Determine the stability criteria of the system shown below for which PI controller is used. Use τ1=1\tau_1 = 1, τ2=12\tau_2 = \tfrac{1}{2}, τ3=13\tau_3 = \tfrac{1}{3}, Kc=5K_c = 5 and τI=0.25\tau_I = 0.25.
GTU Instrumentation and Process Control (3150504) Winter 2025 Question 4(c) Diagram
(a)
3 marks
Write in brief about ON/OFF controller.
(b)
4 marks
Derive the transfer function of PID control
(c)
7 marks
For the control system diagram shown below, derive the transfer function C(s)/R(s)
GTU Instrumentation and Process Control (3150504) Winter 2025 Question 4 OR (c) Diagram

Q.5

14 Marks
(a)
3 marks
Describe PLC, DCS, and SCADA in brief.
(b)
4 marks
Explain dynamic characteristics of an instrument.
(c)
7 marks
Explain construction and working of optical pyrometer.
(a)
3 marks

Explain working of wet bulb and dry bulb thermometer used for measurement of relative humidity.

(b)
4 marks
Discuss the pitot tube for flow measurement.
(c)
7 marks
Explain the principal, construction and working of bellows differential-pressure gauge.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Instrumentation and Process Control (Winter 2025, 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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