# INSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad ELECTRICAL AND ELECTRONICS ENGINEERING TUTORIAL QUESTION BANK

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1 Course Name Course Code Class Branch INSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad ELECTRICAL AND ELECTRONICS ENGINEERING TUTORIAL QUESTION BAN : CONTROL SYSTEMS : A50 : III B. Tech I Semester Year : Course Faculty : Electrical and Electronics Engineering : Ms. S Swathi Assistant Professor OBJECTIVES This course it is aimed to introduce the students the principles and applications of control systems in everyday life. The basic concepts of block diagram reduction, time analysis solutions to time invariant systems and also deals with the different aspects of stability analysis of systems in frequency domain and time domain QUESTION BAN ON SHORT ANSWER QUESTIONS S.No QUESTION BLOOMS TAXONOMY LEVEL PROGRAM OUTCOME UNIT-I INTRODUCTION TO CONTROL SYSTEMS AND TRANSFER FUNCTION REPRESENTAION Explain control system? Remember Define open loop control system Remember 3 Define closed loop control system. Remember 4 Define transfer function. Remember 5 Write the force balance equations of ideal mass element, dashpot Understood 6 element, Write the spring analogous element electrical elements in force voltage analogy for Understood 7 the Define elements signal of flow mechanical graph? translational system Understood 8 Define transmittance, sink and source? Understood 9 Write Masons Gain formula Understood 0 Discuss forward path? Understood UNIT-II TIME RESPONSE ANALYSIS Discuss Proportional controller and with advantages? Remember Discuss the drawback in P-controller? Remember 3 Discus integral control action? What is the advantage and Remember 4 disadvantage Discuss PI, PD, in integral and PID controller? Remember 5 Define Damping ratio. How the system is classified depending on the Remember value of damping?

2 6 Distinguish between type and order of a system: Remember 7 Define rise, Delay time Remember 8 Define Peak time, settling time, Peak overshoot., Remember 9 Discuss the relation between generalized and static error coefficients Remember 0 List generalized error coefficients? Remember UNIT-III STABILITY ANALYSIS IN S-DOMAIN AND ROOT LOCUS TECHNIQUE Define BIBO Stability. What is the necessary condition for stability? Remember 3 Describe characteristic equation? How the roots of characteristic equation List the relation are related between to stability? and coefficient of characteristic 3 polynomial? Remember 3 Remember 3 4 Explain the nature of impulse response when the roots of Remember 3 5 characteristic Explain the nature equation of impulse are lying response imaginary if the roots axis? of characteristic Remember equation are lying on right half s-plane? 3 6 Explain root locus? How will you find root locus on real axis? Remember 3 7 Discuss asymptotes? Remember 3 8 Define centroid, how it is calculated? Remember 3 9 List out breakaway point and break in point? Understood 3 0 Explain dominant pole? Understood 3 UNIT-IV FREQUENCY RESPONSE ANALYSIS Define frequency response? With advantages of frequency response Remember 4 analysis? Define frequency domain specifications? Remember 4 3 Define Resonant Peak. Remember 4 4 Define Bode plot? What are the advantages of Bode Plot? Remember 4 5 Define gain margin and phase margin? Remember 4 6 Define corner frequency. Remember 4 7 Explain Gain cross-over frequency and phase cross-over frequency? Remember 4 8 What is polar plot? Remember 4 9 What is lead compensator? Remember 4 0 What is lag compensator?? Remember 4 UNIT-V STATE SPACE ANALYSIS OF CONTINUOS SYSTEMS What are the advantages of state space analysis? Evaluate 5 What are draw backs of transfer function model analysis Analyze 5 3 What is state, state variable and state vector? Remember 5 4 What are the properties of state transition matrix? Understand 5 5 Write resolving matrix? Evaluate 5 6 Define observability? Evaluate 5 7 Define controllability? Evaluate 5 8 How the modal matrix can be determined? Evaluate 5 9 What is i/p and o/p space? Evaluate 5 0 What are eigen values? Evaluate 5

3 GROUP-I (LONG ANSWER TYPE QUESTIONS) S.No. QUESTION UNIT-I BLOOMS TAXONOMY LEVEL INTRODUCTION TO CONTROL SYSTEMS AND TRANSFER FUNCTION REPRESENTATION Explain open loop & closed loop control systems by giving suitable Examples & also highlights their merits & demerits. PROGRAM OUTCOME Remember Explain the difference between Open loop and Closed loop systems? Remember 3 Explain the classification of control systems? Remember 4 Explain mathematical model of a physical system? Explain briefly Remember 5 (a)explain the traffic control systems using open loop and closed loop systems? (b) Explain the temperature control system using open loop and closed loop systems? (c) Human being is an example of closed loop system. Justify your answer? 6 Discus basis for framing the rules of block diagram reduction technique? What are drawbacks of the block diagram reduction technique? 7 How do you construct a signal flow graph from the equations? List advantages of signal flow graph over block diagram? Remember Evaluate Evaluate 8 Explain about mason s gain formula? Evaluate 9 Find the overall gain of the system shown below? Evaluate 0 Obtain the overall transfer function C/R from the signal flow graph shown. Evaluate UNIT-II TIME RESPONSE ANALYSIS (a)explain about various test signals used in control systems? (b)define time constant and explain its importance? (a)derive the expression for time domain specification of a under damped second order system to a step input? 3 (a)derive the transient response of under damped second order system when excited by unit step input? Remember Evaluate Evaluate

4 (b)derive the transient response of un damped second order system when excited by unit step input? 4 (a)derive the transient response of over damped second order system when excited by unit step input? (b)derive the transient response of critically damped second order system when excited by unit step input? 5 (a)how steady state error of a control system is determined? How it can be reduced? (b) Derive the static error constants and list the disadvantages? 6 For a system G s H s = S S+ (S+3) state error to 0 when input to system is + 0t + 40 t Find the value of to limit steady 7 (a)explain error constants p, v and a for type I system. (b) Explain error constants p, v and a for type II system. 8 (a)explain the effect of PI control on the performance of control system (b)explain the effect of PD control on the performance of control system 9 (a)what are P, D, and controller? Why D controller is not used in control systems? (b) What are generalized error constants? State the advantages and significance of generalized error constants? 0 Discuss the advantages and disadvantages of proportional, proportional derivative, proportional integral control system. Define the terms UNIT-III Evaluate Remember Evaluate Remember &Evaluate STABILITY ANALYSIS IN S-DOMAIN AND ROOT LOCUS TECHNIQUE (i) Absolute stability (ii) marginal stability (iii) conditional stability (iv) stable system (v) Critically stable system (vi) conditionally stable system? State Routh s stability criterion. State their advantages What are the limitations of Routh Hurwitz criteria? 3 List the necessary conditions to have all the roots of characteristics equation in the left half of s-plane? 4 By means of Routh criterion,determine the stability represented by characteristic equation,s 4 +s 3 +8s +4s+3=0 5 The open loop transfer function of a unity feedback system is given by.find the restriction on k so that the closed loop S +0.5S (+0.4S) system is absolutely stable. 6 (a)explain the steps for the construction of root locus? (b)from the given root locus plot, how can you determine the gain margin and phase margin for the specified gain value k Understand Understand Remember 3 Remember 3 7 The open loop transfer function of a control system is given by G(s) H(s) = sketch complete root locus. S S+6 (S +4S+3) 8 Check whether the points lie (-+j) and (-3+j) lie on the root locus of a system given by G(s) H(s)=.use the angle condition. S+ (S+)

5 9 Sketch the root locus G(S)=/s(s +6s+0), H(S)= 0 Check the stability of the given characteristic equation using Routh s method S 6 + S 5 + 8S 4 + S 3 + 0S + 6S + 6 = 0 UNIT-IV FREQUENCY RESPONSE ANALYSIS Discuss frequency response? What are advantages of frequency response analysis? Apply Understood 4 (a)write short notes on various frequency domain specifications (b) Derive expression for resonant peak and resonant frequency and hence establish correlation between time and frequency response. 3 Explain the steps for the construction of Bode plot? What are the advantages of Bode Plot? 4 Sketch the Bode plot for the open loop transfer function 0(S + 3) S S + (S + 4S + 00) 5 The open loop transfer function of a system is S + S ( + 0.S) Determine the value of such that (i) Gain Margin = 0dB and (ii) Phase Margin = 50 degree 6 Given the open loop transfer function hence the phase and gain margins. 0 s +3s (+4S) Draw the Bode plot and 7 Sketch the bode plot for a system with unity feedback having the transfer function, and assess its closed-loop stability S(s + 6s + 00) Sketch the bode plot for a system with unity feedback having the transfer function, and assess its closed-loop stability. 0 S +0.4s (+0.s) Remember 4 Remember 4 9 Draw the polar plot for open loop transfer function for unity feedback system G(s)=.determine gain margin, phase margin? s +s (+S) 0 Discuss lead, lag compensator? UNIT-V STATE SPACE ANALYSIS OF CONTINUOS SYSTEMS Explain the state variable and state transition matrix? Creating &analyse Write shot notes on formulation of state equations? Analyse 5 3 Derive the expression for the calculation of the transfer function from the state variables for the analysis of system? 4 Write short notes on canonical form of representation.list its advantages and disadvantages? 5 Apply 5 Evaluate 5

6 5 derive the controllable canonical form for the following transfer function Y S U S =b 0S n +b S n + b S n +.. b n S+b n S n +a S n + a S n S+P n 6 derive the observable canonical form for the following transfer function Y S U S =b 0S n +b S n + b S n +.. b n S+b n S n +a S n + a S n S+P n Remember 5 &Evaluate Understand 5 7 obtain the Jordan canonical form of state space representation for the following transfer function Y(S) = b 0 S n +b S n + b S n +.. b n S+b n U(S) S+P n S+P 4 S+P 5 S+P n Understand Write properties of state transition matrix? State and explain controllability and observability? 0 Write the necessary and sufficient conditions for complete state controllability and observability? GROUP-III (ANALYTICAL QUESTIONS) S.No QUESTION UNIT-I INTRODUCTION TO CONTROL SYSTEMS Write the differential equations governing the Mechanical rotational system shown infig. Draw the Torque-voltage and Torque-current electrical analogous circuits. Understand 5 Creating &analyse BLOOMS TAXONOM Y LEVEL 5 Evaluate 5 PROGRAM OUTCOME Write the differential equations governing the Mechanical system shown in fig. and determine the transfer function

7 3 Obtain the transfer function X(s)/F(s) for the mechanical system as shown in figure 4 Find the transfer function of the electrical network shown in figure Apply 5 For the mechanical system shown in Figure 3, determine the transfer function Y(s)/F(s) and Y(s)/F(s) 6 Determine the overall transfer function C(S)/R(S) for the system shown in fig 7 Discuss Mason s gain formula. Obtain the overall transfer function C/R from the signal flow graph shown.

8 8 Determine the transfer function C(S)/R(S) of the system shown below fig..3 by block diagram reduction method 9 Reduce the given block diagram and hence obtain the transfer function C(s)/R(s) evaluate 0 Draw a signal flow graph and evaluate the closed-loop transfer function of a system whose block diagram is given as follows UNIT-II TIME RESPONSE ANALYSIS A unity feedback system has 40(S+) S S+ (S+4) Determine (i) Type of the system (ii) All error coefficients and (iii) Error for the ramp input with magnitude 4 For a unity feedback system whose open loop transfer function is G(s) = 50/(+0.s)(+s), find the position, velocity & acceleration error Constants. 3 A unity feedback system is characterized by an open loop transfer function S(S + 0) Determine gain so that system will have a damping ratio of 0.5. For this value of determine settling time, peak overshoot and time to peak overshoot for a unit step input. Also obtain closed loop response in time domain

9 4 The open loop transfer function of a unity feedback system is given by S(TS+) where and T are positive constants. By what factor should the amplifier gain be reduced so that the peck overshoot of unit step response of the system is reduced from 75% to 5%? Apply 5 A unity feed-back system is characterized by the open-loop transfer function: G(s) s(0.5s )(0.s ). Determine the steady-state errors for unity-step, unit-ramp and unit-acceleration input. Also find the damping ration and natural frequency of the dominant roots. 6 The forward transfer function of a unity feedback type, second order system has a pole at -. The nature of gain k is so adjusted that damping ratio is 0.4. The above equation is subjected to input r(t)=+4t. Find steady state error? 7 A feedback control system is described as G(s) = 50/s(s+)(s+5), H(s) = /s For a unit step input, determine the steady state error constants & errors. 8 The closed loop transfer function of a unity feedback control system is given by- C(s)/R(s) = 0/(s +4s+5) Determine (i) Damping ratio (ii) Natural undammed resonance frequency (iii) Percentage peak overshoot (iv) Expression for error response 9 For a unity feedback system whose open loop transfer function is G(s) = 50/(+0.s)(+s), find the position, velocity & acceleration error Constants. 0 The open loop transfer function of a control system with unity feedback is given by 00 G(s) s(s 0.s) error of the system when the input is 0+0t+4t. Determine the steady state UNIT-III Apply STABILITY ANALYSIS IN S-DOMAIN AND ROOT LOCUS TECHNIQUE With the help of Routh Hurwitz criterion comments upon the stability of the system having the following characteristic equation S 6 +s 5 -s 4-3s 3-7s -4s-4=0 How many roots does each of the following polynomials have in the Right half of the s-plane. s 4 +s 3 +4s +8s+5 3 The system having characteristic equation s 4 +4s +=0 (i) the number of roots in the left half of s-plane (ii) the number of roots in the right half of s-plane (iii)the number of roots on imaginary axis use RH stability criterion.

10 4 A unity feedback system has an open loop transfer function. Use RH test to determine the range of positive G (s) (s )(s 4s 5) values of for which the system is stable 5 Find the range of for stability of the system with characteristic equation s 4 +3s 3 +3s +s+k=0 6 For the unity feedback system the open loop T.F. is S +0.6S (+0.4S) Determine(a) Range of values of, marginal (c) Frequency of 7 Sketch the Root Locus for the unity feedback system with G s H s = S S + S + 3 (S + 6) 8 Sketch the complete Root Locus of the system S S + (S + 4S + 3) 9 Sketch root locus plot for unity feedback system whose open loop T.F is given by G(S)= k(s+0.5) s (s+4.5) 0 Sketch the root locus plot of a unity feedback system whose open loop s T.F is G(s)= s +4 (s+) UNIT-IV FREQUENCY RESPONSE ANALYSIS Given damping ratioξ=0.7 and ω n =0 rad/sec find the resonant peak, resonant frequency and band width. For a second order system with unity feedback G(s)= 00 s(s+8).find various frequency domain specifications. Sketch bode phase angle plot of a system G(s)= (+s)(+s) 3 Draw the exact bode plots and find the gain margin and phase margin 0(s+) of a system represented by G(s)H(s)= s (s+0.05)(s+3)(s+5) 4 Draw the exact bode plots and find the gain margin and phase margin 0(s+) of a system represented by G(s)= s (s+0.05)(s+3)(s+5),h(s)= 5 The open loop transfer function of a unity feedback system is 50 G(s)= s (s+0)(s+5)(s+) (i)gain margin and phase margin (ii) the value o steady state error coefficient for a gain of 0db and the value which will make the closed loop system marginally stable. Evaluate 3 Evaluate 3 Evaluate 3 Evaluate 3

11 6 Sketch the bode plot for transfer function G(s)= s and find value of such that gain cross over (+0.s)(+0.0s) frequency is 5 rad/sec 7 5(s+5) Sketch the bode plot or a system G(s) = s (s +6s+00).hence determine the stability of the system e 0.s 8.5 Sketch the bode plots of G(s)=.hence find the gain s(+s)(+0.s) cross over frequency A unity feedback control system has G(s)= s(s+)(+ s the ).find 0 value of so that GM=db and PM=30deg. Sketch polar plot for G(S) = S with unity feedback (+s)(+s) system. Determine gain margin and phase margin. UNIT-V STATE SPACE ANALYSIS OF CONTINOUS SYSTEMS linear time invariant system is described by the following state model. Obtain the canonical form of the state model. Creating &analyse. convert x the following x system 0 matrix to canonical form A= a linear time invariant system is described by the following state model.obtain the canonical form of state model x = 0 x 0 3 x x + u and y= x 4 convert the following system matrix to canonical form and hence 4 calculate the STM A= 0 3 x 5 Evaluate 5 Evaluate 5 Analyse 5 5 a system variables for the state variable representation of the system are, A=,B= 0, C = 0 Evaluate 5 Determine the complete state response and the output response of the system for the initial state X(0)= 0

12 6 for the state equation x =Ax Evaluate Where A= 3 0.find the intial condition vector x(0) 7 6 which will excite only the mode corresponding to eigen value with the most negative real part. 7 consider the differential equation system given by y + 3y + Y = 0, y(0)=0.,y(0)=0.05. Understand 5 Obtain the response y(t),subjected to the given intial condition 8 consider the system described by the state equation Remember 5 X(t)= e t 0 x(t)+ 0 u(t) 9 determine the state controllability and observability of the following system x x 3 = x.5 x + 4 u 0 examine the observability of the system given below using canonical form x x x 3 = Y=[3 4 ] x x x 0 x + 0 u x3 Prepared by: Ms. S. Swathi Assistant Professor Apply 5 Remember 5 HOD, ELECTRICAL AND ELECTRONICS ENGINEERING

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