Gujarat Technological UniversitySummer 2023 examination

GTU 3151908 Control Engineering Summer 2023 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
What are the advantages and disadvantages of open loop and closed loop systems?
(b)
4 marks

Explain the open-loop operation of traffic signals at a road crossing. How can improved traffic control be achieved by means of a closed-loop scheme?

(c)
7 marks
What is transfer function? Derive the transfer function of spring – mass –damper system.

Q.2

14 Marks
(a)
3 marks
Draw a general block diagram of Automatic Control System.
(b)
4 marks
(i) Differentiate between time varying and time invariant system (ii) Differentiate between linear and nonlinear control system
(c)
7 marks

Draw equivalent mechanical and electrical systems to relate force voltage or force current analogy.

(c)
7 marks
Write the differential equations governing the mechanical system. Derive transfer function of x1(s)/F(s)x_1(s)/F(s).
GTU Control Engineering (3151908) Summer 2023 Question 2 OR (c) Diagram

Q.3

14 Marks
(a)
3 marks
Explain following rules for Block Reduction with a sketch: (1) Blocks in cascade (2) Eliminating forward loop (3) Eliminating feedback loop
(b)
4 marks
Explain following terms in regard to transient response specification of second order control system using neat sketch.
  • Delay time tdt_d
  • Rise time trt_r
  • Peak time tpt_p
  • Maximum overshoot MpM_p
(c)
7 marks

A system has a characteristic equation,

q(s)=s6+9s5+31.25s4+61.25s3+67.75s2+14.75s+15=0.q(s) = s^6 + 9s^5 + 31.25s^4 + 61.25s^3 + 67.75s^2 + 14.75s + 15 = 0.
Determine whether the system is stable, marginally stable or unstable using the Routh-Hurwitz criterion.

(a)
3 marks
What do you mean by Stability of Control System?
(b)
4 marks
Explain Proportional hydraulic control system.
(c)
7 marks

Using the Routh-Hurwitz criterion for simple design problems, consider that the characteristic equation of a closed-loop control system is

s3+3Ks2+(K+2)s+4=0s^3 + 3Ks^2 + (K+2)s + 4 = 0
Determine the desired range of K so that the system is stable.

Q.4

14 Marks
(a)
3 marks
Compare between hydraulic and pneumatic control systems.
(b)
4 marks
State constructional steps for Root Locus method.
(c)
7 marks
Explain unit step response of first order linear time invariant systems.
(a)
3 marks
Explain various test signals used in control systems.
(b)
4 marks
Which are different Industrial Controllers? Explain Tuning of PID controllers.
(c)
7 marks

Sketch the root locus plot of the system with

G(s)=Ks(s+1)(s+2),H(s)=1G(s) = \frac{K}{s(s+1)(s+2)},\quad H(s) = 1

Q.5

14 Marks
(a)
3 marks
Describe the working of a force distance type pneumatic proportional controller.
(b)
4 marks
Define frequency domain specifications with neat sketch.
(c)
7 marks

Draw the Bode magnitude and phase plot of the following open-loop transfer function and determine gain margin, phase margin and absolute stability?

G(s)H(s)=1s(s+1)G(s)H(s) = \frac{1}{s(s+1)}

(a)
3 marks
Write about pneumatic power sources.
(b)
4 marks

What is FRL unit in pneumatic system? State various components used in pneumatic circuit

(c)
7 marks

Determine the transfer function C(s)/R(s) for the system shown in figure using Mason’s gain formula.

GTU Control Engineering (3151908) Summer 2023 Question 5 OR (c) Diagram

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About this paper

Official Gujarat Technological University (GTU) examination paper for Control Engineering (Summer 2023, 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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