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Posted By: CONFIDENCE IS THE COMPANION OF SUCCESS Member Level: Diamond Posted Date: 17 Apr 2008
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2007 Anna University B.E Electrical and Electronics CONTROL SYSTEMS Question paper
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FOURTH SEMESTER
ELECTRICAL AND ELECTRONICS ENGINEERING
EE 235 -CONTROL SYSTEMS
TIME:Three hours Maximum: 100 marks
Answer ALL questions.
PART A -(10*2=20 MARKS)
1. Enlist the advantages of closed loop control system.
2. Give the statement of Mason's gain formula.
3. Define order and type of a system.
4. Define static error coefficients.
5. Define risetime for a second order system.
6. Define bandwidth of a system.
7. State Routh stability criteria.
8. Differentiate absolute stability and relative stability of a system.
9. State the basic characteristics of lead compensation.
10. What is the effect of lag-lead compensator?
PART B-(5*16= 80 MARKS)
11. (a) Write the rules of block diagram algebra for the following (i) blocks in cascade (ii) eliminating a forward loop (iii) eliminating a feedback loop (iv) moving a pick off point after a block. (4*4=16 marks)
OR
(b) For an armature controlled dc motor derive the transfer function. (16 marks)
12. (a) Plot the unit step transient response curve and specify the following :
(i) Delay time
(ii) Peak time
(iii) Maximum overshoot
(iv) Settling time. (4*2=8 marks)
OR
(b) (i) Discuss the advance of dynamic error coefficients. (6 marks)
(ii) Find the dynamic error coefficients of unity feedback control system whose feed forward transfer function is given by G(s)=10/s(s+1). Find also the steady state error to the input defined by r(t)=a0+a1t+a2t^2. (10 marks)
13. (a) Determine the frequency domain specifications for a second order system with unity feedback and G(s)=225/s(s+6). (16 marks)
OR
(b) (i) Discuss the advantages of frequency domain analysis. (6 marks)
(ii) Find the frequency domain specifications with a unity feedback system having G(s)=36/s(s+8). (10 marks)
14. (a) (i) Test the stability using Routh's criterion for he polynomial s^4+2s^3+3s^2+4s+5=0. (8 marks)
(ii) Determine the range of K for the system to be stable if the characteristic equation is s^4+3s^3+3s^2+2s+k=0. (8 marks)
OR
(b) For the characteristic equation s^5+2s^4+24s^3+48s^2-25s-50=0 perform complete Routh stability analysis. (16 marks)
15.(a) Discuss the procedure for designing a lead compensator based on frequency response approach. (16 marks)
OR
(b) Discuss the procedure for designing a lag compensator by the root locus method. (16 marks)
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