Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem Old 161905 Control Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:161905 Date:14/05/2019
Subject Name: Control Engineering
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Justify ?Spring is a non liner element over and arbitrary range of Extension?. 07
(b) Write Requirements of a good control system. Critically compare Open loop
and Closed loop systems. Is an automatic electric iron an open loop or closed
loop control system?
07
Q.2 (a) Briefly explain Signal flow graphs with their properties. Also explain Mason?s
gain equation for signal flow graph.
07
(b) Write short note on: Analogue models of mechanical and electrical system. 07
OR
(b) What does a block diagram represent? Explain it in detail. List its salient
characteristics.
07
Q.3 (a) Derive the Mathematical modeling of a thermal system. 07
(b) Explain liquid level system with block diagrams and reduce it to a single block
open loop system. Where, Q = Flow rate from control valve to 1
st
tank, Q1 =
Flow rate from 1
st
tank to 2
nd
tank, Q2 = Flow rate from 2
nd
tank, H1 = Height
of liquid in 1
st
tank, H2 = Height of liquid in 2
nd
tank.
07
OR
Q.3 (a) What is Transfer function? Obtain the transfer function of mechanical network
shown in Figure.
07
(b) Explain Translational mechanical and Rotational mechanical systems. 07
Q.4 (a) Explain the following :
(1) Proportional lag and Controlled lag
(2) Linear time invariant and Linear time varying systems
07
(b) Find the input?output transfer function T=Y/U of the system by reducing the
following block diagram.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:161905 Date:14/05/2019
Subject Name: Control Engineering
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Justify ?Spring is a non liner element over and arbitrary range of Extension?. 07
(b) Write Requirements of a good control system. Critically compare Open loop
and Closed loop systems. Is an automatic electric iron an open loop or closed
loop control system?
07
Q.2 (a) Briefly explain Signal flow graphs with their properties. Also explain Mason?s
gain equation for signal flow graph.
07
(b) Write short note on: Analogue models of mechanical and electrical system. 07
OR
(b) What does a block diagram represent? Explain it in detail. List its salient
characteristics.
07
Q.3 (a) Derive the Mathematical modeling of a thermal system. 07
(b) Explain liquid level system with block diagrams and reduce it to a single block
open loop system. Where, Q = Flow rate from control valve to 1
st
tank, Q1 =
Flow rate from 1
st
tank to 2
nd
tank, Q2 = Flow rate from 2
nd
tank, H1 = Height
of liquid in 1
st
tank, H2 = Height of liquid in 2
nd
tank.
07
OR
Q.3 (a) What is Transfer function? Obtain the transfer function of mechanical network
shown in Figure.
07
(b) Explain Translational mechanical and Rotational mechanical systems. 07
Q.4 (a) Explain the following :
(1) Proportional lag and Controlled lag
(2) Linear time invariant and Linear time varying systems
07
(b) Find the input?output transfer function T=Y/U of the system by reducing the
following block diagram.
07
2
OR
Q.4 (a) Compare the hydraulic system with the pneumatic system with appropriate
example.
07
(b) Reduce block diagram as shown in Figure and obtain overall transfer function.
07
Q.5 (a) Compare and contrast pneumatic system with hydraulic system. 07
(b) Classify DC motors. Discuss their characteristics. Explain the construction and
components of a DC motor.
07
OR
Q.5 (a) Write note on "Programmable Logic controller (PLC) with its advantages. Also
write its applications
07
(b) Explain pneumatic nozzle-flapper amplifier with a neat sketch. 07
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This post was last modified on 20 February 2020