Gujarat Technological UniversityWinter 2023 examination

GTU 3151908 Control Engineering Winter 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 10:30 AM – 1:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks

Define transfer function and state its properties for closed loop system.

(b)
4 marks
Compare Open loop and closed loop control systems.
(c)
7 marks
Using block diagram reduction technique, obtain the overall transfer function of the system whose block diagram is as given in Fig. -
GTU Control Engineering (3151908) Winter 2023 Question 1(c) Diagram

Q.2

14 Marks
(a)
3 marks
Define: State, state vector and State space.
(b)
4 marks

Enlist the type of controllers. Explain Two position On-off controller with neat sketch.

(c)
7 marks
Obtain Transfer function and state space model for the electrical system shown in Fig. 2.
GTU Control Engineering (3151908) Winter 2023 Question 2(c) Diagram
(c)
7 marks
Use Mason’s Gain formula, Obtain the transfer function of the control system shown in
GTU Control Engineering (3151908) Winter 2023 Question 2 OR (c) Diagram

Q.3

14 Marks
(a)
3 marks
Define the terms: (1) Peak time (2) Maximum overshoot (3) Rise time (4) Settling time
(b)
4 marks

Find the range of K for stability using Routh’s stability criteria for the unity feedback system whose open loop transfer function is given by

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

(c)
7 marks
Determine the values of K and k of the closed-loop system shown in Fig. 4 so that the maximum overshoot in unit-step response is 25% and the peak time is 2 sec. Assume J=1 kg-m².
GTU Control Engineering (3151908) Winter 2023 Question 3(c) Diagram
(a)
3 marks

Determine: (i) Poles (ii) Zeros (iii) Characteristic equation for the control system represented by following equation.

T(S)=K(S+5)S(S+1)(S−2)(S2+7S+12)T(S) = \frac{K(S+5)}{S(S+1)(S-2)(S^2 + 7S + 12)}

(b)
4 marks
Explain the terms: (1) steady state error (2) Time constant
(c)
7 marks
Sketch the root loci for the system shown below:
GTU Control Engineering (3151908) Winter 2023 Question 3 OR (c) Diagram

Q.4

14 Marks
(a)
3 marks
List out the advantages of frequency response analysis
(b)
4 marks

Explain Nyquist stability criterion for frequency response unity feedback systems with suitable example.

(c)
7 marks

Explain Phase margin and Gain margin related to frequency response.

(a)
3 marks

What is lag and lead compensation for frequency response analysis?

(b)
4 marks
What is Bode plots. State its advantages.
(c)
7 marks

Write a short note on Relative stability for frequency response method with neat sketches for various stabilities.

Q.5

14 Marks
(a)
3 marks
Write a short note on pneumatic actuating valve.
(b)
4 marks

Explain the working principle of nozzle-flapper with neat line sketch.

(c)
7 marks

Compare the features, merits and demerits of pneumatic system and hydraulic system in detail.

(a)
3 marks
Explain the importance of FRL unit of the pneumatic system.
(b)
4 marks

Draw a generalized hydraulic control system and state function of each component.

(c)
7 marks

Write a note on working of Hydraulic Proportional plus integral (PI) controller with neat sketch and obtain the transfer function of the same.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Control Engineering (Winter 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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