EC2255 Control Systems Question Bank : kings.ac.in

Name of the College : Kings College Of Engineering
Department : Electronics & Communication Engineering
Subject : Control Systems
Website : kings.ac.in
Document Type : Question Bank

Download :https://www.pdfquestion.in/uploads/ki…%20SYSTEMS.pdf

Kings Control Systems Question Paper

Unit I

Control System Modelling :
Part – A :
1. What is control system?
2. Define open loop control system.
3. Define closed loop control system.

Related : Kings College of Engineering EE1153 Basic Electrical & Electronics Engineering B.E Question Bank : www.pdfquestion.in/1560.html

4. Define transfer function.
5. What are the basic elements used for modeling mechanical rotational system?
6. Name two types of electrical analogous for mechanical system.
7. What is block diagram?
8. What is the basis for framing the rules of block diagram reduction technique?
9. What is a signal flow graph?
10. What is transmittance?
11. What is sink and source?

12. Define non- touching loop.
13. Write Masons Gain formula.
14. Write the analogous electrical elements in force voltage analogy for the elements of mechanical translational system.
15. Write the analogous electrical elements in force current analogy for the elements of mechanical translational system.
16. Write the force balance equation of m ideal mass element.
17. Write the force balance equation of ideal dashpot element.
18. Write the force balance equation of ideal spring element.
19. What is servomechanism?
20. Why is negative feedback invariably preferred in closed loop system?

Part – B :
1. Write the differential equations governing the Mechanical system shown in fig. and determine the transfer function. (16)
2. Determine the transfer function Y2(S)/F(S) of the system shown in fig. (16)
3. Write the differential equations governing the Mechanical rotational system shown in fig. Draw the Torque-voltage and Torque-current electrical analogous circuits. (16)
4. Determine the overall transfer function C(S)/R(S) for the system shown in fig. (16)
5. Obtain the closed loop transfer function C(S)/R(S) of the system whose block diagram is shown in fig. (16)
6. For the system represented by the block diagram shown in fig. Determine C1/R1 andC2/R1. (16)
7. Obtain the closed loop transfer function C(S)/R(S) of the system whose block diagram is shown in fig. (16)
8. Find the overall gain of the system whose signal flow graph is shown in fig. (16)
9. Draw a signal flow graph and evaluate the closed loop transfer function of a system
Whose block is shown in fig? (16)
10. Derive the transfer function for Armature controlled DC servo motor. (16)
11. Derive the transfer function for Field controlled DC servo motor. (16)

Unit II

Time Response Analysis :
Part-A :
1. What is Proportional controller and what are its advantages?
2. What is the drawback in P-controller?
3. What is integral control action?
4. What is the advantage and disadvantage in integral controller?
5. What is PI controller?
6. What is PD controller?
7. What is PID controller?
8. What is time response?
9. What is transient and steady state response?
10. What is the importance of test signals?
11. Name the test signals used in control system.
12. Define Step signal :
13. Define Ramp signal :
14. Define parabolic signal :
15. What is an impulse signal?
16. What is the order of a system?
17. Define Damping ratio.
18. Give the expression for damping ratio of mechanical and electrical system.
19. How the system is classified depending on the value of damping?
20. What will be the nature of response of a second order system with different types of damping?
21. Sketch the response of a second order under damped system.
22. What is damped frequency of oscillation?
23. List the time domain specifications :
24. Define Delay time.
25. Define rise time.
26. Define Peak time.
27. Define Peak overshoot.
28. Define settling time.
29. What is type number of a system? What is its significance?
30. Distinguish between type and order of a system :
31. What is steady state error?
32. Define acceleration error constant :
33. What are generalized error coefficients?
34. Give the relation between generalized and static error coefficients :
35. Mention two advantages of generalized error constants over static error constants

Part-B :
1. (a) Derive the expressions and draw the response of first order system for unit step input. (8)
(b) Draw the response of second order system for critically damped case and when input is unit step. (8)
2. Derive the expressions for Rise time, Peak time, and Peak overshoot. (16)
3. A potential control system with velocity feedback is shown in fig. What is the response of the system for unit step input? (16)
4. Measurements conducted on a Servomechanism show the system response to be c(t)=1+0.2 ê 60t-1.2 ê –10 t. when subjected to a unit step. Obtain an expression for closed loop transfer function. (16)
5. A positional control system with velocity feedback is shown in fig. What is the response c(t) to the unit step input. Given that =0.5.and also calculate rise time, peak time, Maximum overshoot and settling time. (16)
6. A unity feedback control system has an open loop transfer function G(S) = 10/S(S+2). Find the rise time, percentage over shoot, peak time and settling Time. (16)
7. A closed loop servo is represented by the differential equation, where c is the displacement of the output shaft, r is the displacement of the input shaft and e= r-c. Determine undamped natural frequency, damping ratio and percentage maximum overshoot for unit step input. (16)
8. For a unity feedback control system the open loop transfer function G(S) = 10(S+2)/ S2 (S+1). Find
(a) Position, velocity and acceleration error constants.
(b) The steady state error when the input is R(S) where R(S) =3/S –2/S2 +1/3S3 (16)
9. The open loop transfer function of a servo system with unity feedback system is G(S) = 10/ S(0.1S+1). Evaluate the static error constants of the system. Obtain the steady state error of the system when subjected to an input given by the polynomial r(t) = a0+a1t +a2 /2 t2 . (16)