Download GTU B.Tech 2020 Winter 7th Sem 2172007 Modern Control Systems Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2172007 Modern Control Systems Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2172007 Date:28/01/2021
Subject Name:Modern Control Systems
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Using suitable block diagram, explain ON-OFF control systems.
03

(b) Explain PID control in details.
04

(c) Explain pole placement design using state feedback.
07
Q.2 (a) List any three properties of z-Transform.
03

(b) Explain relationship between z-domain and s-domain
04

(c) List various characteristics of feedback control systems and explain any
07
two of them using block diagram and mathematical equations.




Q.3 (a) Explain need for reshaping of root locus plot.
03

(b) How locations of closed-loop pole decide the transient response of the
04
system? Explain using suitable examples.

(c) Explain various guidelines for sketching a root locus plot from given
07
transfer function.




Q.4 (a) Define (i) centroid (ii) asymptotes (iii) dominant pole
03

(b) Explain angle of departure in root locus technique.
04

(c) What is lag compensator? What are the effects of lag compensator?
07
Explain design steps for design of lag compensator using root locus
technique.
Q.5 (a) Explain phase margin and gain margin.
03

(b) Give differences between phase lead and phase lag compensation
04

(c) Explain method to draw bode plot from given transfer function.
07



Q.6 (a) With suitable diagrams define (i) Phase crossover frequency (ii) Gain
03
crossover frequency

(b) Explain Decade and Octave.
04

(c) Explain design procedure for cascade lag compensator using bode-plot.
07
Q.7 (a) Define (1) state (2) state variable (3) state vector
03

(b) Explain derivation of transfer function from state model.
04

(c) Obtain state space model for RLC series circuit in which input is Vdc and
07
output voltage across capacitor.



Q.8 (a) List the advantages of state space approach of analyzing the control
03
systems.
(b) Explain the term Controllability and Observability.
04
(c) Explain Taylor series expansion for computing the state transition matrix.
07

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