Jawaharlal Nehru Technological University Anantapur 2011-3rd Year B.Tech Electronics and Communications Engineering Control Systems s, - Question Paper

Jawaharlal Nehru Technological University, Anantapur

ans any 5 ques.
All ques. carry equal marks Max Marks:80
1. describe and discuss the subsequent terms
(a) Characteristic formula
(b) Order of a transfer function
(c) kind of a transfer function
(d) Poles and zeros of a transfer function. [16]

2. Represent the subsequent set of formula by a signal flow graph and determine the overall gain relating x5 and x1?
x2 = ax1 + fx2
x3 = bx2 + ex4
x4 = cx3 + hx5
x5 = dx4 + gx2 [16]

3. (a) elaborate the kinds of controllers that are used in closed loop system? discuss them?
(b) The response of a system subjected to a unit step input is c(t) = one + 0.2e-60t -1.2e-10t
find the expression for the closed loop transfer function? Also determine the Un damped natural frequency and damping ratio of the system? [8+8]

4. discuss the stability of the system from the root locus plot in the subsequent situations with suitable examples?
(a) addition of open loop poles
(b) addition of open loop zeros. [16]

5. (a) Write a note on frequency domain specifications?
(b) For a system the resonant peak is one dB an ?n = p10 r/s. obtain resonant frequency.Also obtain the phase angle of closed loop transfer function at resonant frequency? [6+10]

6. (a) What is "Nyquist Contour"?
(b) A system is provided by G(s) = 4s+1s2(s+1)(2s+1) Sketch the Nyquist plot & hence determine the stability of the system? [2+14]
7. (a) What is compensation? elaborate the various kinds of compensators?
(b) What is a lag compensator, find the transfer function of lag compensator and draw pole-zero plot?
(c) discuss the various steps to be followed for the design of compensator using Bode plot? [3+3+10]

8. (a) explain the significance of state Space Analysis?
(b) describe state variables.
(c) find the state variable representation of an armature controlled D.C Servomotor? [3+3+10]

Earning:   Approval pending.