GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Subject Code:3151908
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
Subject Name:Control Engineering
Time:10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) Define following related to control systems: (i) Transfer Function, (ii) Poles & (iii) Zeros | 03 |
| (b) Explain various rules of block-diagram reduction with neat sketches. | 04 | |
| (c) Discuss Force-Current analogy with suitable example. | 07 | |
| Q.2 | (a) Explain the linearization of non-linear systems with a suitable sketch. | 03 |
| (b) Define controlled variables and manipulated variables with suitable example. | 04 | |
| (c) Differentiate between open loop and closed loop control systems with suitable examples. | 07 | |
| Q.3 | (a) Define Rise time, Peak time and Settling time for unit step response of second order systems. | 03 |
| (b) Discuss briefly about standard input test signals for time domain systems with neat sketches. | 04 | |
| (c) A unity feedback control system has its open-loop transfer function given by G(s) = (4s+1)/(4s^2). Determine and expression for the time response when the system is subjected to Unit step input. | 07 | |
| Q.4 | (a) Define following related to state-space analysis of a control system: (i) State, (ii) State variables, (iii) State space | 03 |
| (b) Determine stability of a close-loop system using Routh-Hurwitz criterion whose characteristics equation is s^3+4.5s^2+3.5s+1.5=0 | 04 | |
| (c) Obtain unit step response of first order system and discuss steady state error for the same. | 07 | |
| Q.5 | (a) Write any three salient features of Root Locus plot. | 03 |
| (b) Explain the concepts of Observability and Controllability. | 04 | |
| (c) Explain the procedure of drawing Bode plot and determination of gain margin, phase margin and stability with a suitable example. | 07 | |
| Q.6 | (a) Write steady state error coefficients for type ‘0’system with Unit step, Unit ramp and Unit parabolic inputs. | 03 |
| (b) Briefly discuss about the relative stability from Nyquist plot. | 04 | |
| (c) Explain experimental determination of close loop transfer function with suitable example. | 07 | |
| Q.7 | (a) Explain tuning of a PID controller in brief. | 03 |
| (b) Explain working of hydraulic PID controller with neat sketches and write transfer function for the same with usual notations. | 07 | |
| Q.8 | (a) Explain briefly various elements of pneumatic circuit. | 03 |
| (b) Compare hydraulic and electrical control systems. | 04 | |
| (c) Sketch a schematic diagram of pneumatic nozzle-flapper amplifier system and explain its working. Sketch and explain characteristic curve relating nozzle back pressure and nozzle flapper distance for the same. | 07 |
Date:22/01/2021
Total Marks: 56
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