Gujarat Technological UniversitySummer 2025 examination

GTU 3151908 Control Engineering Summer 2025 Question Paper & PDF

B.E. · Mechanical Engineering · Semester 5 · Subject code 3151908
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Define:
i)Manipulated variable
ii)Disturbance
iii)Controlled variable.
(b)
4 marks
Compare open loop control system and closed loop control system.
(c)
7 marks

Explain the working principle of a closed loop control system with the help of schematic of an air conditioner.

Q.2

14 Marks
(a)
3 marks
Define following for a signal flow graph:
i)Node
ii)Path
iii)Branch
iv)Loop
v)non-touching loop
vi)Self-loop.
(b)
4 marks
Explain following test signals with their plot and transfer function:
i)Impulse function
ii)Unit step function
iii)Unit Ramp function
iv)Parabolic function.
(c)
7 marks

Obtain Transfer function X1(S)/U(S) and X2(S)/U(S) for following mechanical system.

(c)
7 marks
Find transfer function E0(S)/Ei(S) for following electrical circuit:

Q.3

14 Marks
(a)
3 marks

List and explain the conditions for linearity of a mathematical equation representing a system.

(b)
4 marks

Plot the poles and zeroes of a system represented by following transfer function: G(S) = (S+2)/S²+2S+3

(c)
7 marks

Determine the range of K for which a control system represented by the polynomial S⁴+3s³+3s2 +2s+K=0 will be stable.

(a)
3 marks
Define transfer function. List its properties.
(b)
4 marks
Determine the transfer functions of:
i)P-type controller
ii)P-I type controller
iii)P-I-D type controller.
(c)
7 marks
Plot the root locus of a control system represented by:

Q.4

14 Marks
(a)
3 marks
Define:
i)Lead compensation
ii)Lag compensation
(b)
4 marks
Explain relative stability analysis in frequency response analysis.
(c)
7 marks
Explain Ziegler-Nichols rule for tuning of P-I-D controller.
(a)
3 marks
Describe the need of tuning PID controllers.
(b)
4 marks
Explain Nyquist stability criterion in detail.
(c)
7 marks
Draw the Bode plot of following transfer function:

Q.5

14 Marks
(a)
3 marks
List the sources of hydraulic power for hydraulic control systems.
(b)
4 marks
Compare Hydraulic control system with Pneumatic control system.
(c)
7 marks

Explain the working of Pneumatic Nozzle-Flapper device with the help of its characteristic curve.

(a)
3 marks
List and explain various components of pneumatic control system.
(b)
4 marks
Explain any Force-balance type controller with neat diagram.
(c)
7 marks

With the help of neat diagram, Explain the working of Hydraulic integral controller and derive its transfer function.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Control Engineering (Summer 2025, B.E. · Mechanical 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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