# Download GTU B.Tech 2020 Summer 5th Sem 2151908 Control Engineering Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 5th Sem 2151908 Control Engineering Previous Question Paper

Seat No.: ________
Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? V EXAMINATION ? SUMMER 2020
Subject Code: 2151908 Date:02/11/2020
Subject Name: Control Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS
Q.1 (a) Define transfer function with example.
03

(b) Distinguish open loop and closed loop control system with example.
04

(c) Find transfer function with Block diagram reduction technique.
07
Figure : 1

Q.2 (a) Explain transfer function of feedback and feed forward loop.
03

(b) Write note on mason's gain formula.
04

(c) Determine C/R1 and C/R2 for system shown in Figure 2.
07
Figure : 2

OR

(c) Solve SFG in figure 3 with Mason's Gain Formula.
07
1

Figure : 3

Q.3 (a) Explain disadvantages of closed loop system.
03

(b) Explain Force-Voltage and Force-Current analogy.
04

(c) Define following terms in context with the transient response specifications of second
07
order system using neat sketch: Delay time, Rise time, Peak time, Maximum overshoot,
settling time.

OR

Q.3 (a) Discuss the types of inputs with examples.
03

(b) Explain the transient and steady state response of the system with neat sketch
04

(c) Discuss time response of Second order control system for unit step input and also discuss
07
effect of damping factor on time response of Second order control system.
Q.4 (a) Discuss the limitation of Routh criteria.
03

(b) Using Routh criterion, check the stability of system with characteristic equation
04
(s + 2) (s - 2)(s + j) (s - j) (s2 + s + 1) = 0

(c) Sketch the root locus of open loop transfer function of a control system is given
07
by G(s). H(s) =
(+6)(2+4+13)

OR

Q.4 (a) Explain the method of finding angle of departure from the complex pole in root
03
locus method.

(b) Using Routh criterion, discuss about the stability for the system having characteristics
04
equation is given as 3s7 +9s6 + 6s5+ 4s4 + 7s3 + 8s2+ 2s + 6 = 0

(c) Sketch the root locus of open loop transfer function of a control system is given
07
by G(s). H(s) = (+1)2
(+2)2
of frequency response analysis.
03

(b) With the help of neat diagrams, explain how the direction control valves are classified
04

(c) Draw a neat sketch of a pneumatic PID controller, its block diagram and state the transfer
07
function for the same.

OR

Q.5 (a) Explain terms; stable system, unstable system, marginally stable system.
03
(b) With the help of necessary diagram, explain Pneumatic nozzle flapper amplifier.
04
(c) Draw the schematic diagram of Pneumatic PD controller. Explain its working and derive
07
its transfer function.

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