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UANDISTAR Code No: V0223/R07 II B.Tech II Semester, Regular Examinations, Apr - 2011 CONTROL SYSTEMS (Com. to EEE, ECE, ECC) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. a) What is meant by feedback and list out its characteristics b) Find the transfer function ) ( ) ( 2 s F s X of the system given in figure. 2. a) Explain the need of electrical analog systems b) Derive the transfer function and develop the block diagram of armature controlled DC servo motor 3. a) Determine the response of second order system with unit step input b) The open loop transfer function of unit feedback system is given by . ) 1 ( ) ( Ts s K s G + = i) By what factor should the amplifier gain K be multiplied so that the damping ratio is increased from 0.2 to 0.7. ii) By what factor should K be multiplied so that the maximum overshoot of step response is reduced from 70% to 25%. 4. a) What are the limitations of Routh stability criterion? How to overcome them b) Sketch the root locus for the characteristic equation 0 ) 4 ( ) 3 ( ) 1 ( = + + + + s k s s s 5. Sketch the Bode plot and determine the following: i) Gain crossover frequency ii) Phase crossover frequency iii) Gain margin iv) Phase margin for the transfer function given as ) 4 . 0 1 ( 1 . 0 ) 2 ( 10 ) ( s s s e s s G + - + = 6. A unity feedback control system has an open loop transfer function given by ) 2 )( 4 ( 50 ) ( ) ( + + = s s s s H s G . Draw Nyquist diagram and Comment on stability. 1 of 2 SET - 1
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UANDISTAR Code No: V0223/R07 7. a) What is the need of lead compensator? Derive its transfer function and also draw the bode plot b) Explain the design procedure of PID controllers 8. a) What are the merits and demerits of state variable techniques b) Determine the state controllability and observability of the following system: [ ] 2 1 , 1 0 , 3 0 0 1 = g187 g188 g186 g171 g172 g170 = g187 g188 g186 g171 g172 g170 - - = C B A 2 of 2 SET - 1
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UANDISTAR Code No: V0223/R07 II B.Tech II Semester, Regular Examinations, Apr - 2011 CONTROL SYSTEMS (Com. to EEE, ECE, ECC) Time: 3 hours Max Marks: 80
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