Tuesday, 4 August 2015

CONTROL SYSTEM PART B IMPORTANT QUESTIONS For External Exams

VIDYARTHIPLUS.COM 2013 1 CONTROL SYSTEM PART B IMPORTANT QUESTIONS

UNIT 1
1. Explain the TF of armature and field controlled DC motor. (16)
2. Problem from mechanical translational system(analogy of force- voltage and force- current) (16)
3. Problem from signal flow graph + block diagram (8 +8 )

Unit 2
1. Explain servomotors and its types (16)
2. Derive the time response of underdamped and critically damped second order system for unit step input (16)
3. Derive the expression for time domain specifications (16)

unit 3
1. Derive the frequency domain specifications of second order system (16)
2. Problem from bode plot determining phase margin,gain margin ,determination of k value,gain and phase cross over frequency( any 2 ) (16)
3. Problem from polar plot (same as bode plot )(16)
4. Ecplain frequency domain specifications (8)

Unit-4
1. Explain the locatiuon of poles on s-plane for stability (16)
2. Problems from routh Hurwitz criterion (8)
3. Problems to determine gain and phase cross over frequency, gain and phase margin from given TF (16)
4. Problems from root locus (16)

Unit – 5
1. Derive the realisation of electrical network, frequency response, determination of maximam phase lag and max. Lag angle for a) lag compensator (16) b) lead compensator (16) (separate questions)
2. problems from lag compaensator or lead compensator (each 16 marks )

Control System IMPORTANT QUESTIONS For External Exams

Anna University
Control System IMPORTANT QUESTIONS
(Department of ECE)

Subject Code : EC2255
Subject Name : CONTROL SYSTEMS

UNIT I

1.Using masons gain formula determine the ratio C/R for the system represented by the following diagram

2. Determine the overall transfer function of the following diagram

3. Obtain the response of unity feedback system whose open loop transfer function is G(S) =4 / {s (s + 5)} and when the input is unit step

4. Obtain the analogous electrical network for the following block diagram

UNIT II

1. A unity feedback system G(s)=10/s(s+1)(s+2).Find the steady state error when it is subjected to the i/p r(t)=1+2t+1.5t2
2. Derive an expression for the time response of an under damped second order system and when the input is unit step
3. Explain in detail the system response with PD,PI and PID Controller
4. Derive an expression for time to peak and peak overshoot for a second order under damped system

UNIT III

1. Draw the Bode plot of the G(s) = K / S(S+1)(0.1S+1) .Hence obtain the exact plot by doing necessary corrections at corner frequencies.
(i)Find the gain cross over freq, Phase cross over freq, margin and phase margin.
(ii)Find the value of K for phase margin = 20 deg.

2. The open loop transfer function of a unity feed back system is G(s) = 1 / s(1+s)(1+2s) .Sketch the polar plot and determine the gain margin and phase margin

3. Obtain the unit impulse response and the unit step response of a unity feedback system whose open loop transfer function is G(S) = (2s + 1)/ s2.
4. Determine the generalized error coefficient and steady state error for a system whose open loop transfer function is G(S) = 1/ { s (s+1)(s+10) }and the feedback transfer function is H(S) = (s+2) with input r(t) = 6 + t + t2

UNIT IV

1. Check The stability of the system
(i) .
(ii) .Determine the range of K when the system is stable

2. Sketch the root locus for the system and write about the system stability

G(s)H(s)=K(s+4)(s+5)/(S+4)(S+1), K>0

3. A feedback control system has a open loop transfer function G(s)H(S)=K/(S(S+3)(S2 +2S+2))
Find the root locus as K Varies From 0 to α

Unit V(Important Problem to go through )

1. Look Problem to Determine controllability and observability
2. Problem regarding Response to some unit step input, For data control system
3. Determine the transfer matrix for a given data

EC2255 CONTROL SYSTEM STUDY TIPS

EC2255 CONTROL SYSTEM STUDY TIPS

this all just a tips for average students ,, it may or may not come in university exams

UNIT 1 :

Differential equation & Transfer function,
Modeling of Electric systems,
Translational and rotational mechanical systems
Block diagram reduction Techniques

UNIT 2:

P, PI, PD and PID controllers
Time response analysis for all
Steady state errors problems & other problems

UNIT 3:

Frequency Response
Bode Plot,
Polar Plot,
Nyquist Plot
Constant M and N Circles

UNIT 4: will be soon

UNIT 5:

look all problems under

State space representation of Continuous Time systems and discrete time
State equations
Transfer function from State Variable Representation
Concepts of Controllability and Observability

it all very easy to get marks

Control System – 16marks Very Important Questions For External Exams

Control System – 16marks Very Important Questions For External Exams
Control System–16marks Important Questions

Anna University
CONTROL SYSTEM
16marks IMPORTANT QUESTIONS
Recommended For EEE Department
Semester 4

UNIT 1

1. Explain the TF of armature and field controlled DC motor. (16)

2. Problem from mechanical translational system(analogy of force- voltage and force- current) (16)

3. Problem from signal flow graph + block diagram (8 +8 )

Unit 2

1. Explain servomotors and its types (16)

2. Derive the time response of underdamped and critically damped second order system for unit step input (16)

3. Derive the expression for time domain specifications (16)

Unit 3

1. Derive the frequency domain specifications of second order system (16)

2. Problem from bode plot determining phase margin,gain margin ,determination of k value,gain and phase cross over frequency( any 2 ) (16)

3. Problem from polar plot (same as bode plot )(16)

4. Explain frequency domain specifications (8)

Unit-4

1. Explain the locatiuon of poles on s-plane for stability (16)

2. Problems from routh Hurwitz criterion (8)

3. Problems to determine gain and phase cross over frequency, gain and phase margin from given TF (16)

4. Problems from root locus (16)Unit – 5

1. Derive the realisation of electrical network, frequency response, determination of maximum phase lag and max. Lag angle for

a) lag compensator (16)

b) lead compensator (16) (separate questions)

2. problems from lag compensator or lead compensator (each 16 marks )

EE2351 POWER SYSTEM ANALYSIS ANNA UNIVERSITY QUESTION PAPER, IMPORTANT QUESTIONS, 2 MARKS AND 16 MARKS QUESTIONS FOR EEE DEPARTMENT

EE 2351 POWER SYSTEM ANALYSIS ANNA UNIVERSITY QUESTION PAPER, IMPORTANT QUESTIONS, 2 MARKS AND 16 MARKS QUESTIONS FOR EEE DEPARTMENT

ANNA UNIVERSITY QUESTION PAPER POWER SYSTEM ANALYSIS IMPORTANT QUESTIONS, 2 MARKS AND 16 MARKS QUESTIONS FOR EEE DEPARTMENT

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011
Sixth Semester
Electrical and Electronics Engineering
EE 2351 — POWER SYSTEM ANALYSIS
(Regulation 2008)
Time : Three hours Maximum : 100 marks
PART A — (10 × 2 = 20 marks)1. Draw a simple per-phase model for a cylindrical rotor synchronous machine.
2. What are the advantages of per unit system?
3. What is Jacobian matrix?
4. What is a slack bus?
5. Mention the objectives of short circuit analysis.
6. Write down the balanced and unbalanced faults occurring in a power system.
7. What is sequence network?
8. Write the symmetrical components of a three phase system?
9. Define critical clearing angle.
10. Write swing equation.

PART B — (5 × 16 = 80 marks)11. (a) (i) With the help of single line diagram, explain the basic components
of a power system. (8)
(ii) Write detailed notes about the per-phase model of a three phase
transformer. (8)
Or
(b) Draw the impedance diagram for the electric power system shown in
figure 11 (b) showing all impedance in per unit on a 100-MVA base.
Choose 20-kV as the voltage base for generator. The three-phase power
and line-line ratings are given below. (16)
G1 : 90 MVA 20 kV X = 9%
T1 : 80 MVA 20/200 kV X = 16%
T2 : 80 MVA 200/20kV X = 20%
G2 : 90 MVA 18 kV X = 9%
Line : 200 kV X = 120
Load : 200 kV, S = 48 MW + j64Mvar
Fig. 11. (b)
12. (a) With neat flow chart explain the computational procedure for load flow
solution using fast decoupled method when the system contains all types
of buses. (16)
Or
(b) Explain the step by step computational procedure for the Gauss-Seidel
method of load flow studies. (16)
13. (a) Explain symmetrical fault analysis using Z-bus matrix with neat flow
chart. (16)
Or
(b) A 11 kV, 100 MVA alternator having a sub-transient reactance of 0.25 pu
is supplying a 50 MVA motor having a sub-transient reactance of 0.2 pu
through a transmission line. The line reactance is 0.05 pu on a base of
100 MVA. The motor is drawing 40 MW at 0.8 p.f. leading with a
terminal voltage of 10.95 kV when a 3-phase fault occurs at the generator
terminals. Calculate the total current in generator and motor under fault
conditions. (16)
14. (a) What are the assumptions to be made in short circuit studies? Deduce
and thaw the sequence network for a line to line fault at the terminals of
Or
(b) Two 11 kV, 20 MVA, three phase, star connected generators operate in
parallel as shown in Figure 14. (b) ; the positive, negative and zero
sequence reactance’s of each being, respectively, j0.l8, j0.15, j0.10 pu. The
star point of one of the generators is isolated and that of the other is
earthed through a 2.0 ohms resistor. A single line to ground fault occurs
at the terminals of one of the generators.
Estimate
(i) the fault current,
(ii) current in grounding resistor, and
(iii) the voltage across grounding resistor. (16)
Fig. 14. (b)
15. (a) Describe the Runge-Kutta method of solution of swing equation for
multi-machine systems. (16)
Or
(b) Derive an expression for the critical clearing angle and clearing time. (16)

Power Systems 2 Important Questions For External Exams

Power Systems 2 Important Questions For External Exams

Model Question I
Model Question Paper-I

Part A

1. Name the three parts of a distribution system.
2. What are the different types of bus bar arrangements?
3. Name the three types of electric drives.
4. Draw the torque load characteristic of a DC series motor.
5. Name the various traction system.
6. Define average speed and schedule speed.
7. What is meant by transition in series – parallel connections?
8. Define the following terms and state their units
i)Luminous flux ii)Luminous intensity.
9. Mention any three applications of Dielectric heating.
10. List the types of electric welding.

Part B

11. Classify the substations on the basis of service and design.
12. Compare group drive and individual drive.
13. Name the various system of track electrification.
14. State the two laws of illumination.
15. Compare are welding and resistance welding.(Only five points)

Part C

16. (a) Compare the cost of conductor in AC 3 phase 3 wire to DC 2 wire on general assumption.
(or)
(b) Draw a simple line diagram layout of a typical 11kv/400v substation with all details.

17. (a) Explain the various factors governing the selection of motors for a particular drive.
(or)
(b) Explain how plugging is applied to DC shunt motor, DC series motor and induction motors.

18. (a) A train runs with an average speed of 40kmph. Distance between stations is 2km. Values of acceleration and retandation are 1.5kmphps and 2.5kmphps respectively.Find the maximum speed of train assuming trapezoidal speed – time curve.
(or)
(b) Write short notes on (i)Bow collector (ii)Pantograph.

19. (a) Explain the shunt transition method in steps with a neat diagram.
(or)
(b) Explain with neat sketch the construction and working of a Sodium Vapour Lamp.

20. (a) Explain the principle of operation of eddy current heating with the help of neat sketch and state its applications.
(or)
(b) With a neat sketch and explain laser beam welding. Give its applications

Model Question Paper-II

Part A

1. Name the distribution system based on construction.
2. Name any three types of substations based on service requirement.
3. What are the disadvantages of individual drive?
4. Mention the types of motor used for (i)Belt conveyor (ii)Crane and (iii)Centrifugal pump.
5. Mention any two system of Railway Electrification.
6. Define tractive effort of a motor.
7. Name the three types of breaking.
8. What is an Indirect lighting?
9. What are the commonly used heating element materials?
10. What are the uses of Ajax Wyatt core type induction furnace in industries?

Part B

11. Explain Ring main system of distribution.
12. Mention any five merits in using electric breaking
13. Briefly explain about single phase low frequency system.
14. What is stroboscopic effect on Fluorescent Lamp and how it can be minimized?
15. What are the requirements of heating element material?

Part C

16. (a) A single phase AC distributor AB 200m long is fed from end ‘A’ and is loaded as under
(i)100A at 0.707p.f lagging 100m from point A
(ii)200A at 0.8p.f lagging 200m from point A
The total resistance and reactance of the distributor is 0.2ohm and 0.1ohm per kilometer. Find the total voltage drop in distributor.
(or)
(b) Name and explain the important equipments used in substation.
17. (a) Explain how dynamic breaking is applied to (i)DC shunt motor and
(ii)Induction motor with suitable circuit diagrams.
(or)
(b) Choose with reasons the suitable electric motor for (i)Cement mill (ii)Textile mill and (iii)Punching machines.

18. (a) Explain the working of a single phase 25kv composite system and state the advantages over DC systems.
(or)
(b) Describe the suitability of a DC series motor for traction duty.

19. (a) Explain the series parallel control of speed of traction motor with circuit diagram.
(or)
(b) A lamp having a uniform luminous intensity of 250CP suspended 6m above street level. What will be the illumination on the ground i) vertically below the lamp ii) 6m away from it.
20. (a) Explain with a neat sketch the construction and working of an indirect core less induction furnace.
(or)
(b) Explain the working of a high frequency dielectric heating. What are its merits and applications?