SRM University 2007 B.Tech Electronics and Communications Engineering UNIT-III - Question Paper

UNIT-III
Part-A
1. What is time response?
2. What is transient and steady state response?
3. What is the importance of test signals?
4. Name the test signals used in control system.
5. Define step signal.
6. Define ramp signal.
7. Define impulse signal.
8. Define parabolic signal.
9. Define pole.
10. Define zeros.
11. What is the order of a system?
12. Define damping ratio.
13. Give the expression for damping ratio of mechanical and electrical system.
14. How the system is classified depending on the value of damping?
15. What will be the nature of response of a 2nd order system with various kinds of damping?
16. Sketch the response of a 2nd order under damped system.
17. What is damped frequency of oscillation?
18. Give the expression for natural frequency of oscillation of electrical and mechanical system.
19. The loop transfer function of 2nd order system is C(s)/R(s)=10/(s2+6s+10). What is the kind of damping in the system?
20. The loop transfer function of 2nd order system is C(s)/R(s)=200/(s2+20s+200). Determine the damping ratio and natural frequency of oscillation.
21. A 2nd order system has a damping ratio of 0.6 and natural frequency of oscillation is 10 rad/sec. Determine the damped frequency of oscillation.
22. The open loop transfer function of a unity feedback system is G(s)=20/s(s+10).What is the nature of response of closed loop system for the unit step input.
23. List the time domain specification.
24. Define delay time.
25. Define rise time.
26. Define peak time.
27. Define Peak overshoot.
28. Define settling time.
29. The damping ratio of a system is 0.75 and the natural frequency of oscillation is 12 rad/sec. Determine the peak overshoot and peak time.
30. The damping ratio of system is 0.6 and natural frequency of oscillation is eight rad/sec. Determine the rise time.
31. What is kind of a system? What is its significance/
32. Distinguish ranging from kind and order of a system.
33. Find the kind and order of the subsequent system C(s)/R(s)=20(s+2) /( s2(s+3)(s+0.5)).
34. What is steady state error?
35. What are static fault constants?
36. Define positional fault constant.
37. Define velocity fault constant.
38. Define acceleration fault constant.
39. A unity feedback system has a open loop transfer function of G(s)=10/(s+1)(s+2). Determine the steady state fault for unit step input.
40. A unity feedback system has a open loop transfer function of G(s)=25(s+4) / s (s+0.5)(s+2). Determine the steady state fault for unit ramp input.
41. A unity feedback system has a open loop transfer function of G(s)=20(s+5)/s (s+0.1)(s+3). Determine the steady state fault for unit parabolic input.
42. What is the effect on system performance when a proportional controller is introduced in a system?
43. What is the advantage in proportional controller?
44. What is the effect of PI controller on the system performance?
45. What is the effect of PD controller on the system performance?
46. Why derivative controller is not used in control systems?


Part-B
1. Derive the response of a I order system to step and ramp inputs.
2. Derive the ramp response of a 2nd order under damped system.
3. Derive the step response of a 2nd order under damped system.
4. Derive the response of an over damped system to a step input.
5. The open loop transfer function of an unity feedback control system is provided by
G(s)=5(s+20) / s(s+4.59)(s2 + 3.41s +16.35).For unit step input, obtain the time response of the closed loop system and determine % overshoot and rise time.
6. What is the unit step response of the system shown below:










7. For a system whose G(s) = 10s / s(s+1)(s+2), obtain the steady state fault when it is subjected to the input r(t) = 1+2t+1.5t2
8. Consider a unity feedback system with a closed loop transfer function
C(s) Ks + b
=
R(s) s2 + as + b
Determine the open loop transfer function G(s). Show that the steady state fault with unit ramp
Input is provided by (a- k) / b.
9. A unity feedback control system has an open loop transfer function G(s) = 10 / s (s+2). obtain the
rise time, % overshoot, peak time and settling time for a step input of 12 units.

10. For a unity feedback control system, the open loop transfer function is provided by
G(s) = 10 (s+2) / (s2 (s+1)). obtain a) the position ,velocity and acceleration fault constants b) the steady state fault when the input is R ( s) = three two 1
- +
s s2 3s3

Earning:   Approval pending.