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Pune University - Sem - IV : Control Systems - Theory & Applications, April 2010

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Total No. of Questions : 5] [Total No. of Pages : 3 P1161 [3729]- 401 M.Sc. (Sem. - IV) ELECTRONIC SCIENCE EL4 UTO6 : Control Systems: Theory and Applications (New Course) (2008 Pattern) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) 2) 3) All questions are compulsory. Figures to the right indicate full marks. Neat diagrams must be drawh wherever necessary. Q1) Solve any Two a) Draw block diagram of a feedback control system and explain various parts in it and their functions. State various types of controllers used in feedback control. [8] b) i) Explain adaptive control strategy. [6] ii)Define transfer function of a control system. [2] c) i) Compare continuous control and discrete state process control . Give an example of each. [4] ii)What are minimum area and quarter amplitude criteria for control system evaluation? [4] Q2) Solve any Two a) Define and explain following terms related to transfer function of a system. - Poles - zeroes - characteristic equation - order - pole - zero plot. [8] b) Taking a suitable example explain the concept of block diagram of a control system. State its advantages and limitations. Explain associative law for block diagram reduction. [8] P.T.O. c) i) Obtain the transfer function of lag network shown below. [4] ii) A proportional controller is used to control the height of water in a tank where the water level can vary from 0 - 9 meter. Calculate the value of PB and Kp that will set the water level at a desired height of 5 meter.The controller is required to fully close the inlet valve when water level rises to 5.5 meter and fully open it when it falls down to 4.5 meter. [4] Q3) Solve any Two a) i) State Routh s stability criterian . What are its advantages and limitations? [4] ii)Define root locus. Explain angle and magnitude conditions. What is their use? [4] b) What is meant by process loop tuning? Explain open - loop transient response method for process loop tuning. [8] c) i) Consider a control system with k G (s) H (s) = s (s + 4) Test the point s = -2 + j 5 for its existence on root locus. Also find the corresponding value of K. [4] ii)What is the difference between a smart and dumb programming terminal? Compare their performance. [4] Q4) Solve any Two a) [3729]-401 What is processor scanning? Discuss PLC program sweep for General Electric series go - 30 PLC. [8] -2- b) i) Explain ON - delay timer instruction. What is meant by timer element ? [4] ii)Explain the working of coffee vending machine as a discrete state control system. Give necessary ladder diagram. [4] c) i) Explain the count - up instruction. What is its use ? [4] ii)With a neat circuit diagram and equation explain the working of PID controller. [4] Q5) Solve any Two a) Explain the data formats used in PLC. [4] b) i) Design a motor controller that has a forward and a reverse button. The motor forward and reverse outputs will only be on when one of the button is pushed. When both buttons are pushed the motor will not work. construct the necessary ladder diagram. [4] ii)Explain the following data handling instructions. Masked move instruction (MVM) Converting an integer to BCD (TOD) c) [4] Write short notes on any Two of the following [8] i) Processor status file. ii)Annunciators. iii)Open PLC systems. iv)ON - OFF control mode. zzzz [3729]-401 - 3-

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Additional Info : M.Sc. - II Electronic Science, EL1 UT 05 : Embedded Systems ( New Course) (2008 Pattern) (Semister - IV), Pune University
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