GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2151908 Date: 19/06/2019
Subject Name: Control Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) What are the limitations of Open-loop system over Closed-loop systems? 03
List the advantages of Closed-loop system.
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(b) State, giving reasons, whether the following are open loop or closed loop 04
control systems.
- Automatic Washing machine
- Walking on the road
- The traffic control system used in road crossings in typical Indian cities
- Maintenance of normal body temperature of a human being.
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(c) Define Transfer function. Obtain the transfer function of mechanical 07
network shown in Figure 1.
Q.2 (a) What is a signal flow graph? State properties of signal flow graph. 03
(b) From a given signal flow graph Figure II using Mason’s gain formula 04
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deduce overall transmittance.(c) Show that the circuit of Fig. (b) is the analogous electrical network for 07
the system shown in Fig (a) using force- voltage analogy.
Take damper as B1 in Fig (a)
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OR
(c) Obtain the transfer function of the mechanical system shown in Fig III 07
and draw its analogous circuit. Also derive its transfer function.
Q.3 (a) Write differences between Hydraulic and Pneumatic control systems. 03
(b) What do you mean by a block diagram? What is meant by summing 04
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point and takeoff point? State the advantages of block diagramrepresentation.
(c) Reduce the block diagram as shown in Fig. IV and obtain overall transfer 07
function.
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OR
Q.3 (a) Explain in brief Routh’s stability criterion. 03
(b) Find the range of values of k for which system, represented by the 04
following expression is stable.
s3 +30s2+600s+ 600 k=0
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(c) Define the term ‘Root locus’. 07
A Feedback control system has open-loop transfer function
GH(s) = K (s +30) / (s + 10)(s + 20)
Draw the root locus as K varies from 0 to 8.
Q.4 (a) State advantages of frequency response analysis 03
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(b) Explain in brief the following frequency response specifications: 04
1) Resonant peak 2) Resonant frequency 3) Bandwidth.
(c) A unity feedback control system has 07
G(s) = r / s(s+7)
- Determine value of ‘r ‘so that maximum overshoot is 40 %
- For this value of r, determine resonant peak value and resonant frequency.
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OR
Q.4 (a) Discuss various types input test signals used for time response analysis of 03
a control system.
(b) Derive unit step response of first order system with usual notations. 04
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(c) The open-loop transfer function of a unity feedback system is , 07
G(s) = 4 / s(s +1)
Determine the nature of the ‘closed-loop system for a unit-step input.
Also, determine the rise time, peak time, peak overshoot and settling time.
Q.5 (a) Explain in brief Pneumatic PI controller. 03
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(b) Obtain state model for the following transfer function. 04
C(s) / R(s) = (s+2) / (s+1)(s+3)
(c) Explain in brief Hydraulic PID controller with a neat diagram. 07
OR
Q.5 (a) What do you mean by Controllers? List the basic types of control action. 03
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(b) Explain generalized hydraulic control system with a neat sketch. 04
(c) Write short note on : 07
- Nozzle-Flapper amplifier
- Compare Modern control theory with conventional control theory
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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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