54 + Interview Questions in State Variable Analysis And Design in Control Systems Page 1 InterviewSolution

1.	State space analysis is applicable for non-linear systems and for multiple input and output systems.(a) True(b) FalseThis question was addressed to me during an interview for a job.My enquiry is from Concepts of State, State Variables and State Model topic in section State Variable Analysis and Design of Control Systems
Answer» Correct CHOICE is (a) True For explanation: State space ANALYSIS is the technique that used state variables and state model for the analysis and is APPLICABLE for non-linear systems and for multiple input and OUTPUT systems.

Discussion

2.	Assertion (A): Many of the linear control system transfer function do not have poles or zeroes in the right half s-plane.Reason (R): These are called minimum phase transfer function.(a) Both A and R are true and R is correct explanation of A(b) Both A and R are true and R is not correct Explanation of A(c) A is True and R is false(d) A is False and R is trueI got this question in homework.The origin of the question is State Variables and Linear Discrete-Time Systems topic in chapter State Variable Analysis and Design of Control Systems
Answer» The CORRECT CHOICE is (a) Both A and R are true and R is correct EXPLANATION of A The best I can explain: For minimum phase systems the poles and zeroes must be on the left side of the s-plane and for the systems which have zeroes on the right HALF of the s plane are called non-minimum phase systems.

Discussion

3.	An electric motor is developing 10KW at a speed of 900rpm. The torque available at the shaft is:(a) 106 N-m(b) 66 N-m(c) 1600 N-m(d) 90 N-mThis question was posed to me in semester exam.Asked question is from State Variables and Linear Discrete-Time Systems topic in division State Variable Analysis and Design of Control Systems
Answer» Right choice is (a) 106 N-m The explanation is: The FORMULA of the TORQUE =9.544*Power/speed in RPM and unit is N-m and by this the value of the torque can be calculated.

Discussion

4.	A system is said to be_____________ if it is possible to transfer the system state from any initial state to any desired state in finite interval of time.(a) Controllable(b) Observable(c) Cannot be determined(d) Controllable and observableThis question was addressed to me in quiz.My question is taken from Controlability and Observability topic in division State Variable Analysis and Design of Control Systems
Answer» Right option is (a) CONTROLLABLE To ELABORATE: By definition a system is said to be controllable, if it is possible to transfer the system state from any initial state to any desired state in finite INTERVAL of TIME.

Discussion

5.	The tacho meter has sensitivity of 5V/1000rpm. The gain constant of the tacho meter is:(a) 0.48V/rad/sec(b) 0.048V/rad/sec(c) 4.8V/rad/sec(d) 48V/rad/secI got this question in class test.Question is taken from State Variables and Linear Discrete-Time Systems topic in division State Variable Analysis and Design of Control Systems
Answer» Right CHOICE is (B) 0.048V/rad/sec The explanation is: GAIN CONSTANT = 560/2p1000(V/rad/sec) 0.048 V/rad/sec.

Discussion

6.	A tachometer is used as an inner loop in a position control servo-system. What is the effect of feedback on the gain of the sub-loop incorporating tachometer and in the effective time constant of the system?(a) Both are reduced(b) Gain is reduced but the time constant is increased(c) Gain is increased but the time constant is reduced(d) Both are increasedThe question was asked in an online quiz.My question is from State Models for Linear Continuous-Time Systems in chapter State Variable Analysis and Design of Control Systems
Answer» The correct answer is (a) Both are reduced The explanation is: TACHOMETER is the DEVICE that is USED to CONTROL the speed of motor in the control system and Feedback and effective time constant of the system both are reduced on the GAIN of the sub-loop.

Discussion

7.	Which of the following is an open loop control system?(a) Field controlled D.C. motor(b) Ward Leonard control(c) Metadyne(d) StroboscopeI got this question in an interview for job.The question is from Observer Systems topic in division State Variable Analysis and Design of Control Systems
Answer» CORRECT ANSWER is (a) Field CONTROLLED D.C. motor Easiest explanation: Open loop control systems are the systems which have no feedback and cannot be used to obtain the DESIRED response and field controlled system is an open loop control system.

Discussion

8.	If the gain of the critical damped system is increased it will behave as(a) Oscillatory(b) Critically damped(c) Overdamped(d) UnderdampedI got this question by my college director while I was bunking the class.Enquiry is from Solution of State Equations in section State Variable Analysis and Design of Control Systems
Answer» CORRECT answer is (d) Underdamped Explanation: Gain of the CRITICAL system is inversely proportional to the root of the DAMPING factor and HENCE on INCREASING the gain the damping reduces and system becomes the underdamped.

Discussion

9.	Error detector:(a) Armature controlled FHP DC motor(b) A pair of synchronous transmitter and control transformer(c) Tach generator(d) AmplidyneThis question was posed to me in semester exam.Question is from Concepts of State, State Variables and State Model in chapter State Variable Analysis and Design of Control Systems
Answer» The CORRECT answer is (a) Armature controlled FHP DC motor Easiest explanation: Error detector is the part in the armature controlled FHP DC motor where error detector is the first ELEMENT that compares the FINAL output with desired output and GIVES the accurate results.

Discussion

10.	The effect of error damping is to(a) Provide larger settling lime(b) Delay the response(c) Reduce steady state error(d) None of the mentionedThe question was posed to me in quiz.My question is based upon Pole Placement by State Feedback topic in section State Variable Analysis and Design of Control Systems
Answer» Correct CHOICE is (C) REDUCE steady state error The explanation is: Error damping refers to the error that is CAUSED by the damping in the system and the effect of this error damping is that it reduces the steady state error and GAIN of the system reduces.

Discussion

11.	Complex conjugate pair:(a) Center(b) Focus point(c) Saddle point(d) Stable nodeI got this question in a national level competition.This interesting question is from Controlability and Observability topic in section State Variable Analysis and Design of Control Systems
Answer» The CORRECT answer is (B) FOCUS point Explanation: Complex CONJUGATE pair is the complex pair of the ROOTS of the equation and has a focus point.

Discussion

12.	____________directly converts temperature into voltage.(a) Thermocouple(b) Potentiometer(c) Gear train(d) LVDTThis question was addressed to me in an interview.This question is from Solution of State Equations in portion State Variable Analysis and Design of Control Systems
Answer» The CORRECT option is (a) Thermocouple To explain: Thermocouple is a DEVICE that CONVERTS the change in the temperature into voltage in which the change in temperature of the different metals RESULTS in change in voltage.

Discussion

13.	Which of the following is exhibited by Root locus diagrams?(a) The poles of the transfer function for a set of parameter values(b) The bandwidth of the system(c) The response of a system to a step input(d) The frequency response of a systemThis question was posed to me in an internship interview.My doubt stems from Diagonalization topic in division State Variable Analysis and Design of Control Systems
Answer» Correct choice is (a) The poles of the transfer function for a set of parameter values To EXPLAIN I would SAY: Root locus diagram is the diagram that is constructed in which the locus is TRACED with the gain with increasing frequency has the poles of the transfer function for a set of parameter values.

Discussion

14.	Which of the following can be measured by LVDT?(a) Displacement(b) Velocity(c) Acceleration(d) All of the mentionedI had been asked this question in exam.The above asked question is from Solution of State Equations topic in section State Variable Analysis and Design of Control Systems
Answer» The CORRECT CHOICE is (d) All of the mentioned To explain I WOULD say: LVDT can measure displacement, velocity and acceleration which is a linear variable differential transformer and inductive transducer.

Discussion

15.	______________ are the techniques for converting general state models into canonical one.(a) Observable(b) Controllable(c) Diagoanlization(d) CannonicalThe question was posed to me in class test.My question is based upon Diagonalization topic in section State Variable Analysis and Design of Control Systems
Answer» Correct option is (C) Diagoanlization Explanation: Diagonalization is the form in which the roots are in the daigonal of the MATRIX and are the techniques for converting general STATE models into canonical ONE.

Discussion

16.	In servo-system, the device used for derivative feedback is known as:(a) Synchro(b) Servomotor(c) Potentiometer(d) Tacho generatorThe question was posed to me in an interview for internship.This question is from State Variables and Linear Discrete-Time Systems topic in section State Variable Analysis and Design of Control Systems
Answer»

Discussion

17.	Consider the function F (s)= 5/s(s^2+3s+2), the initial value of f(t) is:(a) 5(b) 5/2(c) 5/3(d) 0This question was posed to me by my school principal while I was bunking the class.This intriguing question originated from State Variables and Linear Discrete-Time Systems topic in division State Variable Analysis and Design of Control Systems
Answer» CORRECT CHOICE is (d) 0 To explain: For INITIAL value theorem in which time is at t =0 and for the frequency which is the inverse of time, the value of s is replaced with INFINITY and HENCE the value obtained is 0.

Discussion

18.	For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,(a) X/R and L/D are both small(b) X/R is large but L/D is small(c) X/R is small but L/D is large(d) X/R and L/D are both largeI got this question at a job interview.Query is from Concepts of State, State Variables and State Model topic in section State Variable Analysis and Design of Control Systems
Answer» Correct answer is (c) X/R is SMALL but L/D is large Easy explanation: Small X/R GIVES linear speed torque characteristic. Large L/D gives less inertia and GOOD acceleration characteristic.

Discussion

19.	______________ is not a final control element.(a) Control valve(b) Potentiometer(c) Electro-pneumatic converter(d) ServomotorThe question was posed to me during an interview for a job.This is a very interesting question from Pole Placement by State Feedback topic in chapter State Variable Analysis and Design of Control Systems
Answer» Right ANSWER is (b) Potentiometer For explanation: Control element REFERS to the VARIOUS blocks in the whole control process and the various control elements can ce controller as control valve, potentiometer, servomotors and tachometers but potentiometer is not the final control element.

Discussion

20.	Consider a system if represented by state space equation and x1 (t) =x2 (t), then the system is:(a) Controllable(b) Uncontrollable(c) Observable(d) UnstableThe question was posed to me in class test.I need to ask this question from Controlability and Observability in division State Variable Analysis and Design of Control Systems
Answer» Correct option is (B) Uncontrollable Easiest explanation: After CALCULATING the matrix which for controllable system and finding the determinant and should not be ZERO but in this CASE COMES to be zero.

Discussion

21.	In a control system integral error compensation _______ steady state error(a) Increases(b) Minimizes(c) Does not have any effect on(d) All of the mentionedThis question was posed to me in an online interview.My question is based upon Solution of State Equations in section State Variable Analysis and Design of Control Systems
Answer» The correct choice is (b) Minimizes To explain I WOULD say: Integral error compensation is the PHASE LAG compensation and reduces the STEADY STATE error and eliminates the error.

Discussion

22.	Kalman’s test is for :(a) Observability(b) Controllability(c) Optimality(d) Observability and controllabilityI got this question during an interview for a job.My question is from Controlability and Observability topic in chapter State Variable Analysis and Design of Control Systems
Answer» The correct OPTION is (d) OBSERVABILITY and controllability The explanation: KALMAN’s test is the test that is done for the controllability and observability by solving the matrix by kalman’s matrix individually for both TESTS.

Discussion

23.	In case of DC servomotor the back-emf is equivalent to an “electric friction” which tends to :(a) Improve stability of the motor(b) Slowly decrease stability of the motor(c) Vary rapidly decrease stability of the motor(d) Have no effect on stabilityI had been asked this question in an interview for internship.My doubt is from State Models for Linear Continuous-Time Systems in section State Variable Analysis and Design of Control Systems
Answer» CORRECT choice is (a) IMPROVE stability of the motor For EXPLANATION I would say: Back emf is the voltage that is generated in absence of the input and in case of DC servomotor tends to improve the stability of the motor.

Discussion

24.	Assertion (A): In the error detector configuration using a synchro transmitter and synchro control transformer, the latter is connected to the error amplifier.Reason (R): Synchro control transformer has almost a uniform reluctance path between the rotor and the stator.(a) Both A and R are true and R is correct explanation of A(b) Both A and R are true and R is not correct Explanation of A(c) A is True and R is false(d) A is False and R is trueThe question was posed to me in homework.The doubt is from State Models for Linear Continuous-Time Systems topic in portion State Variable Analysis and Design of Control Systems
Answer» Right option is (c) A is TRUE and R is false To ELABORATE: Synchro control transformer is amplifier that is used to amplify the ERROR and synchro TRANSMITTER is used to detect error.

Discussion

25.	Assertion (A): The stator winding of a control transformer has higher impedance per phaseReason (R): The rotor of control transformer is cylindrical in shape.(a) Both A and R are true and R is correct explanation of A(b) Both A and R are true and R is not correct Explanation of A(c) A is True and R is false(d) A is False and R is trueThis question was addressed to me in quiz.I'm obligated to ask this question of State Models for Linear Continuous-Time Systems in chapter State Variable Analysis and Design of Control Systems
Answer» The correct choice is (b) Both A and R are true and R is not correct EXPLANATION of A To explain: The control transformer has two PARTS as STATOR which is stationary having higher impedance and rotor which was ROTATORY was cylindrical in shape.

Discussion

26.	Open loop transfer function of a system having one zero with a positive real value is called.(a) Zero phase function(b) Negative phase function(c) Positive phase function(d) Non-minimum phase functionI had been asked this question in an interview for job.This is a very interesting question from State Models for Linear Continuous-Time Systems topic in section State Variable Analysis and Design of Control Systems
Answer» CORRECT OPTION is (d) Non-minimum phase function The explanation is: Non-minimum phase system has zero LYING on the RIGHT half but not pole and combination of the all pass and minimum phase system can be non-minimum phase system.

Discussion

27.	Real and equal but with opposite sign.(a) Center(b) Focus point(c) Saddle point(d) Stable nodeThe question was posed to me during an internship interview.My doubt stems from Controlability and Observability in portion State Variable Analysis and Design of Control Systems
Answer» The correct OPTION is (c) Saddle POINT For explanation I WOULD say: Saddle point are REAL and equal with opposite SIGN and these points are called the saddle point as the points are different with real and equal with opposite sign.

Discussion

28.	Assertion (A): In a shunt regulator, the control element is connected in shunt with the load to achieve constant output voltage.Reason (R): The impedance of the control element varies to keep the total current flowing through the load and the control element constant.(a) Both A and R are true and R is correct explanation of A(b) Both A and R are true and R is not correct Explanation of A(c) A is True and R is false(d) A is False and R is trueI had been asked this question in a job interview.This question is from State Models for Linear Continuous-Time Systems in portion State Variable Analysis and Design of Control Systems
Answer» Right CHOICE is (C) A is True and R is false For explanation I would say: Shunt REGULATOR refers to the winding connected in shunt or PARALLEL and to achieve constant output voltage.

Discussion

29.	Pressure error can be measured by which of the following?(a) Differential bellows and strain gauge(b) Selsyn(c) Strain gauge(d) Strain gauge and potentiometerThis question was posed to me in an interview for internship.This question is from Pole Placement by State Feedback topic in division State Variable Analysis and Design of Control Systems
Answer» Correct answer is (a) DIFFERENTIAL bellows and strain gauge To explain I WOULD SAY: Pressure error is the error that is caused due to CHANGE in the pressure and the error can be measured by differential bellows and strain gauge which is by the change of dimensions.

Discussion

30.	___________has tendency to oscillate.(a) Open loop system(b) Closed loop system(c) Open and closed loop systems have tendency to oscillate(d) No Systems have tendency to oscillateThis question was posed to me at a job interview.Enquiry is from Observer Systems in division State Variable Analysis and Design of Control Systems
Answer» Right ANSWER is (a) Open loop system The best explanation: Open loop control systems are the systems where the OUTPUT cannot be the desired output and no feedback is used and gain of the system is very high due to this DAMPING is very less and hence system has tendency to oscillate.

Discussion

31.	Which of the following is an electromechanical device ?(a) Induction relay(b) Thermocouple(c) LVDT(d) Any of the mentionedI got this question by my college professor while I was bunking the class.My question is from Solution of State Equations topic in division State Variable Analysis and Design of Control Systems
Answer» The correct CHOICE is (c) LVDT The explanation: LVDT is linear variable DIFFERENTIAL transformer which is an inductive transducer and converts the DISPLACEMENT of the core to the electrical ENERGY and also is electromechanical device.

Discussion

32.	State models presented employed:(a) Physical variables(b) Phase variables(c) Canonical variables(d) All of the mentionedThe question was asked during a job interview.The above asked question is from Diagonalization topic in section State Variable Analysis and Design of Control Systems
Answer» The correct OPTION is (d) All of the mentioned To ELABORATE: STATE models are used in the state model ANALYSIS and is employed inall the variables as physical, PHASE and canonical phase analysis.

Discussion

33.	The impulse response of a linear LTI system is given as g (t) = e^(-t)The transfer function of the system is equal to:(a) 1/s(b) 1/s(s+1)(c) 1/(s+1)(d) s/(s+1)I got this question by my school principal while I was bunking the class.I would like to ask this question from State Variables and Linear Discrete-Time Systems in division State Variable Analysis and Design of Control Systems
Answer» Correct answer is (c) 1/(s+1) The best I can EXPLAIN: Impulse RESPONSE is just the Laplace TRANSFORM of the TRANSFER function and the response is just the Laplace transform of the forward path block.

Discussion

34.	The closed loop transfer function of a unity negative feedback system is 100/(s^2+8s+100). Its open loop transfer function is:(a) 100/s+8(b) 1/s^2+8s(c) 100/s^2-8s(d) 100/s^2+8sThis question was posed to me in unit test.My question is based upon State Variables and Linear Discrete-Time Systems in chapter State Variable Analysis and Design of Control Systems
Answer» Right option is (d) 100/s^2+8s To explain I would SAY: For unity FEEDBACK system the closed loop transfer function is: G/1+GH and the open loop transfer function can be CALCULATED by balancing the VALUE of G.

Discussion

35.	In pneumatic control systems the control valve used as final control element converts(a) Pressure signal to electric signal(b) Pressure signal to position change(c) Electric signal to pressure signal(d) Position change to pressure signalThe question was posed to me in an online quiz.This intriguing question comes from Pole Placement by State Feedback in division State Variable Analysis and Design of Control Systems
Answer» Correct option is (b) Pressure signal to position change For EXPLANATION I would say: In pneumatic control system the control FORCE is the AIR and and can be used as final control element converts the pressure signal to position change.

Discussion

36.	Technique gives quick transient and stability response(a) Root locus(b) Bode(c) Nyquist(d) NicholsThis question was addressed to me during a job interview.I would like to ask this question from Pole Placement by State Feedback in portion State Variable Analysis and Design of Control Systems
Answer» CORRECT option is (a) Root LOCUS Easy explanation: Root locus is the locus of the system that is DRAWN by the CHANGE in the gain with respect to the frequency and this technique gives the quick transient and STABILITY response of the system.

Discussion

37.	State model is generally not suitable for measuring:(a) Investigation of system properties(b) Evaluation of time response(c) Real variables(d) Both a and bThis question was posed to me in an international level competition.I'd like to ask this question from Diagonalization in section State Variable Analysis and Design of Control Systems
Answer» CORRECT choice is (d) Both a and b For explanation I WOULD say: State MODELS are used in the state model analysis and is employed inall the VARIABLES as physical, phase and canonical phase analysis and is generally not suitable for investigation of system properties and evaluation of time RESPONSE.

Discussion

38.	In a closed loop for which the output is the speed of the motor, the output rate control can be used to:(a) Limit the speed of the motor(b) Limit the torque output of the motor(c) Reduce the damping of the system(d) Limit the acceleration of the motorThe question was asked in my homework.This intriguing question comes from State Variables and Linear Discrete-Time Systems topic in division State Variable Analysis and Design of Control Systems
Answer» Right OPTION is (a) Limit the SPEED of the motor Best EXPLANATION: For motor to be the closed loop system the OUTPUT of the system is the speed of the motor and output rate can be to limit the speed of the motor.

Discussion

39.	If the initial conditions are inherently zero, what does it physically mean?(a) The system is at rest but stores energy(b) The system is working but does not store energy(c) The system is at rests or no energy is stored in any of its parts(d) The system is working with zero reference inputI had been asked this question by my school principal while I was bunking the class.Asked question is from State Models for Linear Continuous-Time Systems topic in chapter State Variable Analysis and Design of Control Systems
Answer» Right answer is (c) The system is at rests or no energy is STORED in any of its parts For EXPLANATION I would say: A system with zero initial CONDITION is SAID to be at rest since there is no stored energy.

Discussion

40.	Which of the following statements is not necessarily correct for open control system?(a) Input command is the sole factor responsible for providing the control action(b) Presence of non-linearities causes malfunctioning(c) Less expensive(d) Generally free from problems of non-linearitiesThis question was posed to me in final exam.This is a very interesting question from Observer Systems topic in portion State Variable Analysis and Design of Control Systems
Answer» The correct option is (b) PRESENCE of non-linearities causes malfunctioning To elaborate: OPEN LOOP control system are the systems which have no feedback and cannot be used to obtain the DESIRED response and non-linearities does not cause malfunctioning.

Discussion

41.	A transfer function of the system does not have pole-zero cancellation? Which of the following statements is true?(a) System is neither controllable nor observable(b) System is completely controllable and observable(c) System is observable but uncontrollable(d) System is controllable and unobservableI got this question in an interview.This question is from Controlability and Observability in chapter State Variable Analysis and Design of Control Systems
Answer» Right choice is (b) System is completely controllable and observable Easy EXPLANATION: If the TRANSFER function of the system does not have pole-zero CANCELLATION then it is completely controllable and observable.

Discussion

42.	Servomotor:(a) Armature controlled FHP DC motor(b) A pair of synchronous transmitter and control transformer(c) Tach generator(d) AmplidyneThe question was asked during a job interview.My question is based upon Concepts of State, State Variables and State Model in chapter State Variable Analysis and Design of Control Systems
Answer» Correct ANSWER is (b) A pair of SYNCHRONOUS transmitter and control transformer For EXPLANATION I would say: Servomotor is a rotary actuator or LINEAR actuator that allows for precise control of angular or linear position, VELOCITY and acceleration a pair of synchronous transmitter and control transformer.

Discussion

43.	Which of the following is the definition of proportional band of a controller?(a) The range of air output as measured variable varies from maximum to minimum(b) The range of measured variables from set value(c) The range of measured variables through which the air output changes from maximum to minimum(d) All of the mentionedI had been asked this question in an interview for job.Query is from Pole Placement by State Feedback topic in section State Variable Analysis and Design of Control Systems
Answer» Correct CHOICE is (c) The RANGE of measured variables through which the air output CHANGES from MAXIMUM to minimum The explanation: PROPORTIONAL band of controller is the range of measured variables through which the air output changes from maximum to minimum.

Discussion

44.	When human being tries to approach an object, his brain acts as,(a) An error measuring device(b) A controller(c) An actuator(d) An amplifierThe question was posed to me during an interview.My question comes from Concepts of State, State Variables and State Model in chapter State Variable Analysis and Design of Control Systems
Answer» RIGHT OPTION is (b) A controller The best explanation: Brain of human being ACTS as a controller in the human body system as human body is the control system and when human TRIES to approach an object the brain of the human acts as controller.

Discussion

45.	System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition(a) C(zI-A)^-1B+D(b) C(zI-A)^-1(c) (zI-A)^-1z(d) (zI-A)^-1This question was addressed to me in an interview for job.Query is from Concepts of State, State Variables and State Model in chapter State Variable Analysis and Design of Control Systems
Answer» The CORRECT CHOICE is (a) C(zI-A)^-1B+D To elaborate: Transfer function which is ratio of LAPLACE output to the Laplace input when the initial conditions are zero in discrete is same as CONTINUOUS but in the z-domain.

Discussion

46.	A phase lag lead network introduces in the output(a) Lag at all frequencies(b) Lag at high frequencies and lead at low frequencies(c) Lag at low frequencies and lead at high frequencies(d) None of the mentionedThis question was posed to me in a national level competition.I'd like to ask this question from Pole Placement by State Feedback topic in chapter State Variable Analysis and Design of Control Systems
Answer» Right choice is (c) Lag at LOW FREQUENCIES and LEAD at high frequencies To explain I would say: A phase lag lead network is the network that is similar to the DIFFERENTIATOR and it is used to INCREASE the speed response and increases the stability of the system and this introduces lag at low frequencies and lead at high frequencies.

Discussion

47.	The values of the characteristic equation is given by:(a) Eigen values(b) State matrix(c) Eigen vector(d) None of the mentionedThis question was posed to me at a job interview.I want to ask this question from Diagonalization in division State Variable Analysis and Design of Control Systems
Answer» Right option is (a) Eigen VALUES Easiest EXPLANATION: Eigen values are the values that are obtained by solving the characteristic equation these are the ROOTS of the characteristic equation.

Discussion

48.	Which of the following can be used as a tacho generator in control systems?(a) Microsyn(b) DC servomotor(c) AC servomotor(d) Magnetic AmplifierI have been asked this question in examination.My doubt is from State Variables and Linear Discrete-Time Systems in section State Variable Analysis and Design of Control Systems
Answer» Right choice is (C) AC servomotor The explanation is: TACHO-GENERATOR in the control SYSTEM is used to manage the speed and convert the speed into measurable TERMS and AC servomotor can be used as Tacho generator in control systems.

Discussion

49.	Assertion (A): Transfer function approach has limitation that it reveals only the system output for a input and provides no information regarding the internal state of the system.Reason (R): There may be situations where the output of a system is stable and yet some of the system elements may have a tendency to exceed their specified ratings.(a) Both A and R are true and R is correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is False(d) A is False but R is TrueThis question was addressed to me in an interview for internship.I want to ask this question from Concepts of State, State Variables and State Model topic in division State Variable Analysis and Design of Control Systems
Answer»

Discussion

50.	Pure imaginary pair:(a) Centre(b) Focus point(c) Saddle point(d) Stable nodeThe question was asked in examination.I want to ask this question from Controlability and Observability in chapter State Variable Analysis and Design of Control Systems
Answer» Correct option is (a) Centre Explanation: Pure IMAGINARY PAIR is the nature of the root of the equation that has no real part only has the nature of center for linearized AUTONOMOUS second order SYSTEM.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is an open loop control system?(a) Field controlled D.C. motor(b) Ward Leonard control(c) Metadyne(d) StroboscopeI got this question in an interview for job.The question is from Observer Systems topic in division State Variable Analysis and Design of Control Systems

Complex conjugate pair:(a) Center(b) Focus point(c) Saddle point(d) Stable nodeI got this question in a national level competition.This interesting question is from Controlability and Observability topic in section State Variable Analysis and Design of Control Systems

____________directly converts temperature into voltage.(a) Thermocouple(b) Potentiometer(c) Gear train(d) LVDTThis question was addressed to me in an interview.This question is from Solution of State Equations in portion State Variable Analysis and Design of Control Systems

Which of the following can be measured by LVDT?(a) Displacement(b) Velocity(c) Acceleration(d) All of the mentionedI had been asked this question in exam.The above asked question is from Solution of State Equations topic in section State Variable Analysis and Design of Control Systems

Kalman’s test is for :(a) Observability(b) Controllability(c) Optimality(d) Observability and controllabilityI got this question during an interview for a job.My question is from Controlability and Observability topic in chapter State Variable Analysis and Design of Control Systems

Real and equal but with opposite sign.(a) Center(b) Focus point(c) Saddle point(d) Stable nodeThe question was posed to me during an internship interview.My doubt stems from Controlability and Observability in portion State Variable Analysis and Design of Control Systems

State models presented employed:(a) Physical variables(b) Phase variables(c) Canonical variables(d) All of the mentionedThe question was asked during a job interview.The above asked question is from Diagonalization topic in section State Variable Analysis and Design of Control Systems

Technique gives quick transient and stability response(a) Root locus(b) Bode(c) Nyquist(d) NicholsThis question was addressed to me during a job interview.I would like to ask this question from Pole Placement by State Feedback in portion State Variable Analysis and Design of Control Systems

The values of the characteristic equation is given by:(a) Eigen values(b) State matrix(c) Eigen vector(d) None of the mentionedThis question was posed to me at a job interview.I want to ask this question from Diagonalization in division State Variable Analysis and Design of Control Systems

Pure imaginary pair:(a) Centre(b) Focus point(c) Saddle point(d) Stable nodeThe question was asked in examination.I want to ask this question from Controlability and Observability in chapter State Variable Analysis and Design of Control Systems