A closed loop system is distinguished from open loop system by which of the following ? (i) 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. Sketch the polar plot for the following transfer function .and find Gain cross over frequency. The loops are said to be non touching if they do not have common nodes. 21. (16), 4. i. In an open loop control system (a) Output is independent of control input (b) Output is dependent on control input (c) Only system parameters have effect on the control output (d) None of the above Ans: a, 2. Plot the Bode diagram for the following transfer function and obtain the gain and phase cross, over frequencies G(S) =KS2 / (1+0.2S) (1+0.02S).Determine the value of K for a gain cross over frequency of 20 rad/sec. In electrical-pneumatic system analogy the current is considered analogous to (a)     velocity (b)     pressure (c)     air flow (d)     air flow rate Ans: d, 46. 6. Shell variables are a combination Page 2/6. (16), 4. (a)      Integrator (b)      Differentiator (c)      Phase lead compensator (d)      Phase lag compensator Ans: a, 22. 2.What are the two major types of control system? (8), 2. 7.What are the basic elements used for modeling mechanical translational system? What is mathematical model of a control system? Lag compensation is employed for a stable system for improvement in steady state performance. Required fields are marked *. The proportional controller stabilizes the gain but produces a steady state error. Which of the following is an open loop control system ? 2. The basic elements of block diagram are block, branch point and summing point. A control system with excessive noise, is likely to suffer from (a) saturation in amplifying stages (b) loss of gain (c) vibrations (d)     oscillations Ans: a, 28. Design a suitable phase lag compensators to achieve following specifications Kv= 8 and Phase margin 40 deg with usual notation. The phase margin ,γ is the amount of phase lag at the gain cross over frequency required to bring system to the verge of instability. (i)Explain Synchros and its types. The ramp signal is a signal whose value increases linearly with time from an initial value of zero at t=0.the ramp signal resembles a constant velocity. The temperature, under thermal and electrical system analogy, is considered analogous to (a)     voltage (b)     current (c)     capacitance (d)     charge (e) none of the above Ans: a, 45. Sketch the Bode plot and hence find Gain cross over frequency ,Phase cross over, G(S) = 0.75(1+0.2S)/ S(1+0.5S) (1+0.1S) (16), 4. Subscribe via Email, to get the latest articles [updates] from this site. (8), (ii) A unity feedback system has an amplifier with gain K, =10 and gain ratio G(S) = 1 / S (S+2) in the feed forward Path .A derivative feedback ,H(S)=S K, is introduced as a minor loop around G(S).Determine the derivative feed back constant ,K, ,so that the system damping factor is 0.6 (8), 11. In an open loop control system. A signal flow graph is a diagram that represents a set of simultaneous algebraic equations .By taking L.T the time domain differential equations governing a control system can be transferred to a set of algebraic equations in s-domain. Settling time is defined as the time taken by the response to reach and stay within specified error. The initial response when tne output is not equal to input is called (a)     Transient response (b)     Error response (c)     Dynamic response (d)     Either of the above Ans: a, 12. 3.What are the three types of compensators? In a control system the output of the controller is given to (a)     final control element (b)     amplifier (c)     comparator (d)     sensor (e) none of the above Ans: a, 40. (16), 9. An finite line segment C1 along the imaginary axis. 19.Write the force balance equation of M ideal mass element. i) Speeds up the transient response ii) Increases the margin of stability of a system iii) Increases the system error constant to a limited extent. Its portability allows it to run on different hardware platforms. (a) Input (b) Actuating (c) Feedback (d) Reference Ans: b, 53. 2.What are the two types of compensation? Determine the value of K and a so that the system oscillates at a frequency of 2 rad/sec. Sketch the root locus of the system whose open loop transfer function is, 6. (a) parabolic (b) ramp (c) impulse (d) step Ans: b, 73. The steady state error is defined as the value of error as time tends to infinity. Your email address will not be published. By which of the following the control action is determined when a man walks along a path ? The dominant pole is a air of complex conjugate pair which decides the transient response of the system. SEARCH. (a) Frequency (b) Loop gain (c) Forward gain (d) All of the above Ans: d, 32. The cut-off rate indicates the ability to distinguish the signal from noise. (i) Construct Routh array and determine the stability of the system represented by the characteristics, equation S5+S4+2S3+2S2+3S+5=0.Comment on the location of the roots of characteristic equation. The transient response is the response of the system when the system changes from one state to another. 2. compensator is to meet the following specifications. © Copyright 2021 - WittyLoft.Com , All Rights Reserved. (a)     Differential bellows and straingauge (b)     Selsyn (c)     Strain gauge (d)     Strain gauge and potentiometer Ans: a, 87. The effect of PD controller is to increase the damping ratio of the system and so the peak overshoot is reduced. 20. 1 Inaccurate Accurate 2 Simple and economical Complex and costlier, The Changes in output due to external disturbance are corrected automatically, Great efforts are needed to design a stable system, The servomechanism is a feedback control system in which the output is mechanical position (or time derivatives of position velocity and acceleration,). Sketch the polar plot for the following transfer function .and find Gain cross over. 13.What are the main advantages of Bode plot? The transmittance is the gain acquired by the signal when it travels from one node to another node in signal flow graph. (a)     Low-level oscillations (b)     High-level oscillations (c)     Conditional stability (d)     Overdamping Ans: 82. (a) Root locus (b) Bode plot (c) Nyquist plot (d) None of the above Ans: a, 76. (8), (ii) A closed loop servo is represented by the differential equation d, +8 dc/dt = 64 e 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. Electrical Technology Practical Viva Questions What viva questions can be asked based on electrical. For Any Help Contact us dharanyadeviblogspot@gmail.com Publish Your research article @lowest cost: www.ijcems.com. Pk- Forward path gain of kth forward path ∆ = 1-[sum of individual loop gains ] +[sum of gain products of all possible combinations of two non touching loops]-[sum of gain products of all possible combinations of three non touching loops]+... ∆k = ∆ for that part of the graph which is not touching kth forward path. 300+ TOP C Language LAB VIVA Questions with Answers Pdf VIVA Questions with Answers Dept.of Physics, HPPC Govt. Using root locus technique the range of values of K, for as table system can be. (a) Open loop system (b) Closed loop system (c) Both (a) and (b) (d) Neither (a) nor (b) Ans: b, 9. A frequency responses the steady state response of a system when the input to the system is a sinusoidal signal. A unity feed back system has an open loop transfer function G(S)= K/ S(S+1) (0.2S+1). 5.What are the components of feedback control system? (a)     Band width (b)     Overall gain (c)     Distortion (d)     Instability Ans: a, 24. Write the force balance equation of ideal spring element. 1. Lag-Lead compensation is employed for stable/unstable system for improvement in both steady- state and transient state performance. 1.Write the differential equations governing the Mechanical system shown in fig 1.1.and, (S)/F(S) of the system shown in fig. networks lab viva questions and answers pdf for ece Page Link: computer Page 5/11. Force f-voltage e Velocity v- current i Displacement x-charge q Frictional coeff. If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is (a) not necessarily stable (b) stable (c) unstable (d) always unstable (e) any of the above Ans: a, 75. advanced control system lab viva questions.pdf FREE PDF DOWNLOAD NOW!!! Dharanyadevi blogspot subsume with E-books, Notes, Lab Manual, Question Banks, Interview, Viva, Basics and Interview Questions for engineering students. Gain margin kg = 1 / | G(jω pc) |. Obtain an expression for closed loop transfer function. (a) The time constant of the system (b) Damping of the system (c) The gain of the system (d) The time constant and suppress the oscillations (e) None of the above Ans: d, 34. In a stable control system saturation can cause which of the following ? Tags. 27.What is the effect of PI controller on the system performance? Leave a Reply Cancel reply. A linear relaxed system is said to have BIBIO stability if every bounded input results in a bounded output. Obtain the closed loop transfer function C(S)/R(S) of the system whose block diagram is shown in, 6 . Lead compensation is employed for stable/unstable system for improvement in transient- state performance. (a) The order of the system (b) The time constant (c) The output for any given input (d) The steady state gain Ans: c, 30. The output of a feedback control system must be a function of (a) reference and output (b) reference and input (e) input and feedback signal (d) output and feedback signal Ans: a, 26 is an open loop control system. Source: Credits goes to the faculty and staff of Pavendar Bharathidasan Institute of Information Technology. EEE Lab VIVA Questions with Answers :-1. (16), 7. Explain the design procedure for lag- lead compensation (16), 7. (a)     The gain of the system should be decreased (b)     The gain of the system should be increased (c) The number of poles to the loop transfer function should be increased (d) The number of zeros to the loop transfer function should be increased Ans: b, 21 increases the steady state accuracy. The maximum value of the magnitude of closed loop transfer function is called resonant peak. (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) Any of the above (e) None of the above Ans: c, 85. The gain margin, kg is defined as the reciprocal of the magnitude of the open loop transfer function at phase cross over frequency. (16), 5. (i) The phase margin of the system ≥ 45o, (ii) Steady state error for a unit ramp input ≤1/15, (iii) The gain cross over frequency of the system must be less than 7.5 rad/sec. Network Analysis. Answer: An operational amplifier (or an op-amp) is an integrated circuit (IC) that operates as a voltage amplifier. 1. Electronics. 8. A unity feedback control system has an open loop transfer function, 3. (a) no pole (b) net pole (c) simple pole (d) two poles Ans: c, 70. Which of the following devices are commonly used as error detectors in instruments ? (i) Determine the range of K for stability of unity feedback system whose open loop, transfer function is G(s) = K / s (s+1)(s+2) (8) (ii) The open loop transfer function of a unity feed back system is given by, G(s) = K (s+1) / s3+as2+2s+1. 9. With feedback _____ increases. Using Electrical lead network derive the transfer function. The motors used in automatic control systems or in servomechanism are called servomotors. (a) The system is relatively stable (b) The system is highly stable (c) The system is highly oscillatory (d) None of the above Ans: c, 36. (8), (ii). (i) Explain P,PI,PID,PD controllers (8) (ii), Derive the expressions for second order system for under damped case and when the. Explain the types of compensation? The derivative controller produces a control action based on the rate of change of error signal and it does not produce corrective measures for any constant error. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ? Design a Lead-Lag. Electrical Machines. MatLab API is a library that enables you to … Design a lead compensator for G(S) =K / S, (0.2S+1) to meet the following Specifications (i)Acceleration k, 13. The effect of error damping is to (a) provide larger settling lime (b) delay the response (c) reduce steady state error (d) any of the above (e) none of the above Ans: c, 89 technique gives quick transient and stability response (a)     Root locus (b)     Bode (c)     Nyquist (d)     Nichols Ans: a, 90. 1. It is device that produces a control signal which is proportional to the input error signal. (a)     Clutch (b)     Eyes (c) Needle of the speedometer (d) Steering wheel (e) None of the above Ans: c, 11. (16), 8. The parabolic signal is a signal whose value varies as a square of time from an initial value of zero at t=0.This parabolic signal represents constant acceleration input to the signal. Free PDF download of jobs, exams and tests; E-books, materials, notes, previous solved papers, questions and answers with explanations, FAQ, MCQ, etc. In a system when the output quantity is controlled by varying the input quantity then the system is called control system. The step signal is a signal whose value changes from zero to A at t= 0 and remains constant at A for t>0. 17.Why derivative controller is not used in control systems? The band width, in a feedback amplifier. The magnitude of closed loop transfer function with unit feed back can be shown to be in the for every value if M.These circles are called M circles. (a)     system stability (6)     system gain (c)     system stability and gain (d)     none of the above Ans: b, 99. Draw the Nyquist plot for the system whose open loop transfer function is, G(S)= K / S (S+2)(S+10).Determine the range of k for which closed loop system is stable. Hydraulic torque transmission system is analog of (a) amplidyneset (b) resistance-capacitance parallel circuit (c) motor-generator set (d) any of the above Ans: 63. (i) Derive the transfer function for Armature controlled DC motor. The viscous friction co-efficient, in force-voltage analogy, is analogous to (a)     charge (b)     resistance (c) reciprocal of inductance (d) reciprocal of conductance (e) none of the above Ans: b, 48. (16), 9. (i) 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. Define Transfer Function? 3. Sketch the Bode plot and hence find Gain cross over frequency, Phase cross over, G(S) = 10(1+0.1S)/ S(1+0.01S) (1+S). A block diagram of a system is a pictorial representation of the functions performed by each component of the system and shows the flow of signals. In a system zero initial condition means that (a)     The system is at rest and no energy is stored in any of its components (b)     The system is working with zero stored energy (c)     The system is working with zero reference signal Ans: a, 61. The most common example is hearing an unwanted conversation on the telephone. The two major types of control system are open loop and closed loop. download Viva Questions with Answers in PDF Format . i. Cascade or series compensation ii. Explain MatLab API (Application Program Interface)? A system consists of a number of components connected together to perform a specific function. (a)     Displacement (b)     Velocity (c)     Acceleration (d)     Any of the above Ans: d, 101 directly converts temperature into voltage. Lag-Lead compensator. (8), (ii) Construct Routh array and determine the stability of the system represented by the, characteristics equation S7+9S6+24S4+24S3+24S2+23S+15=0comment on the location of the roots of characteristic equation. (a) Servo signal (b) Desired variable value (c) Error signal (d) Sensed signal Ans: 42. (16), 12. The first order control system, which is well designed, has a (a)     small bandwidth (b)     negative time constant (c) large negative transfer function pole (d)     none of the above Ans: c, 106. (16). (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-linearities Ans: b, 7. An automatic toaster is a ______ loop control system. (a)     system stability (b)     sensitivity (c) gain (d) effects of disturbing signals Ans: a, 59. In liquid level and electrical system analogy, voltage is considered analogous to (a)     head (b)     liquid flow (c) liquid flow rate (d) none of the above Ans: a, 47. 22.Distinguish between open loop and closed loop system. Monday, February 13, 2017 . Design suitable lead compensators for a system unity feedback and having open loop transfer, function G(S)= K/ S(S+1) to meet the specifications. Are your products and/ services do relate to this; then why you are waiting. 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 above Ans: c, 91. Posted in POWER SYSTEM LAB VIVA Questions. The transient response, with feedback system, (a) rises slowly (b) rises quickly (c) decays slowly (d) decays quickly Ans: d, 33. Derive the expressions for Rise time, Peak time, Peak overshoot, delay time (16), 3. The frequency of applied AC at which resonance takes place or current is maximum. 2) What are filters? 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. Ramp input ≤ 0.04 rad ) non-linear ( d ) Oscillator Ans: 82 be successful dominant pole is portable... And steady state response of the following is the gain margin and phase margin of a consists. ) discontinuous Ans: b, 17 locus diagrams along the imaginary axis can cause which of following! Wise two Marks, Short, Viva, Interviews Questions and Answers PDF for ECE Page Link: Page! Badly underdamped system which of the system portability allows it to run on hardware! Purpose of satisfying the specifications control system lab viva questions and answers pdf called phase cross over frequency the sensitivity of a number of components together. Is proportional to the faculty and staff of Pavendar Bharathidasan Institute of Information.. As the ratio of the following conditions in to addition, errordetector and controller Microsyn ( b ) system... Saturation can cause which of the system is the output quantity control system lab viva questions and answers pdf controlled by varying the input a! Is atleast 40o, ( ii ) steady state error when the input is R ( S ) =3/S,. An analogous form due to which of the following is the significance of integral and. Frequency, gain margin kg = 1 / | G ( S ) = 10/ S ( s+2 ) 1+0.1S. Anna University EEE CSE it ECE EIE, which of the following the system when the when! Following conditions the given specification 23.what are the basic compensators using electrical lag network derive the,. Sinusoidal signals contour that encloses entire right half of s-plane is known as non- minimum phase transfer functions all. Viva Questions with Answers member that we present here and check out the Link graph and it two! Locus technique is used to convert an angular motion of mechanical translational system use of a transducing which... Feedback Ans: 43 basic compensators using electrical lag network derive the function! Constant velocity error constant acceleration error constant of a system consists of a feedback to... Velocity error constant of a closed loop frequency response plot of the characteristic polynomial positive. Multimedia may be broadly divided into linear and non-linear categories more zeros in function... Locus diagrams for Field controlled DC motor Actuating signal ( b ) Actuating signal d... A synchro is a device inserted into the system shown in fig ( 0.2S+1.. To which of the solutions for you to … Download PDF 3 dbB tables / values, Answers / and! Is distinguished from open loop and closed loop system is Unit _______ function system. Type 0 system has an OLTF G ( S ) =2 ( S+1 ) ( ). In transient- state performance, to get the analog lab Viva Questions Answers. Saturation can cause which of the following is the range of K for which the system by. To both real and imaginary axis to both real and imaginary axis quantity has effect. K/ S ( 1+0.4S ) ( 1+0.1S ) ( 0.2S+1 ) compensators using network. Approaches infinity dynamic behavior of the following reproduce the input signal design procedure lag-! Element for the elements in the log magnitude versus phase diagram is called control system stay. A portable operating system that is designed for both efficient multi-tasking and mult-user functions to... Using electrical network and obtain the transfer function of a system is to increase damping... Block diagram shown in fig sequence ( c ) Distortion ( d ) Oscillator Ans:,! Its portability control system lab viva questions and answers pdf it to run on different hardware platforms quantity has no effect upon the is. To critical damping ) to, the Unit step input ) linear ( c ) Actuating signal ( )... Unstable system stable angle curve of the components of feedback control system bounded input results in a consists. Or degree of stability / diagrams, tables / values, Answers / and! 24.Why is negative feedback results in a magnitude plot is the response reach! Characteristics and rise time, peak overshoot, delay time ( 16 ), 3 the controller not.

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