A synchro is a device used to convert an angular motion to an electrical signal or vice-versa. Sink is a output node in the signal flow graph and it has only incoming branches. 300+ TOP C Language LAB VIVA Questions with Answers Pdf VIVA Questions with Answers Dept.of Physics, HPPC Govt. (6). It is device that produces a control signal consisting of two terms – one proportional to error signal and the other proportional to the integral of error signal. Lag-Lead compensator. i. Cascade or series compensation ii. (i) Explain P,PI,PID,PD controllers (8) (ii), Derive the expressions for second order system for under damped case and when the. SEARCH. Download PDF format CLICK HERE. The frequency at which resonant peak occurs is called resonant frequency. Network Analysis. Draw a signal flow graph and evaluate the closed loop transfer function of a system whose block is, 10. 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. (a) Underdamping (b) Overdamping (c) Poor stability at reduced values of open loop gain (d) Low-level oscillations Ans: d, 38. Electrical Machines. (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. 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. The dominant pole is a air of complex conjugate pair which decides the transient response of the system. Sketch the polar plot for the following transfer function .and find Gain cross over. (a) Thermocouple (b) Potentiometer (c) Gear train (d) LVDT (e) None of the above Ans: a, 102. The transmittance is the gain acquired by the signal when it travels from one node to another node in signal flow graph. Required fields are marked *. 9.Why Compensation is necessary in feedback control system? (8), (ii). They are used to convert electrical signal into angular motion. (8), 5. This is often used to control the dynamic behavior of the system. These circles are called N circles. Nichols chart of M and N contours, superimposed on ordinary graph. Viva Questions for Lab Programs Computer Science Java Computer Network k-No.of forward paths in the signal flow graph. Which of the following is the input to a controller ? An finite line segment C1 along the imaginary axis. 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. The position and velocity errors of a type-2 system are (a) constant, constant (b) constant, infinity (c) zero, constant (d) zero, zero Ans: c, 72. (a) Systems having complexities and non-linearities (b) Systems having stability problems (c) Systems having multiple input disturbances (d) All of the above Ans: d, 103. (a) Alternating current (b) Direct current (c) A.C. voltage (d) D.C. voltage (e) None of the above Ans: d, 104. Which of the following devices are commonly used as error detectors in instruments ? The main root locus technique is used for stability analysis. 20. The time taken for response to reach 50% of final value for the very first time is delay time. Feedback compensation or parallel compensation. It is device that produces a control signal which is proportional to the input error signal. Obtain the closed loop transfer function C(S)/R(S) of the system whose block diagram is shown in, 6 . A positive phase angle is called phase lead. Download PDF. (i) Derive the transfer function for Armature controlled DC motor. In closed loop control system, with positive value of feedback gain the overall gain of the system will (a) decrease (b) increase (c) be unaffected (d) any of the above Ans: a, 5. Determine the closed loop frequency response and estimate all the frequency domain specifications. 3.What are the three types of compensators? What, 2. Pressure error can be measured by which of the following ? i) Steady state is function of time. Control System. 7.What are the basic elements used for modeling mechanical translational system? Which of the following statements is not necessarily correct for open control system ? (a) Microsyn (b) Selsyn (c) Synchro-resolver (d) Synchro-transformer Ans: c, 88. 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. The band width, in a feedback amplifier. 8.What are the basic elements used for modeling mechanical rotational system? (10), (ii)Write the rules for block diagram reduction techniques. : Credits goes to the faculty and staff of Pavendar Bharathidasan Institute of Information Technology. The transient response, with feedback system, (a) rises slowly (b) rises quickly (c) decays slowly (d) decays quickly Ans: d, 33. The Compensation is the design procedure in which the system behavior is altered to meet the desired specifications, by introducing additional device called compensator. The open loop transfer function of a unity feed back system is G(S) = 1/ S(1+S) (1+2S). An amplidyne can give which of the following characteristics ? ii) The resonant frequency is given by the frequency of G(jω ) at the tangency point. (a) Induction relay (b) Thermocouple (c) LVDT (d) Any of the above (e) None of the above Ans: c, 95. A frequency responses the steady state response of a system when the input to the system is a sinusoidal signal. 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. 1.Write the differential equations governing the Mechanical system shown in fig 1.1.and, (S)/F(S) of the system shown in fig. (a) Manipulated variable (b) Zero sequence (c) Actuating signal (d) Primary feedback Ans: c. 57. (16), 11. In a stable control system backlash can cause which of the following ? Explain the design procedure for lag- lead compensation (16), 7. A unity feedback system has an OLTF G(s) = K / s(s+2)(s+60). Electrical Technology Practical Viva Questions What viva questions can be asked based on electrical. The rules for block diagram reduction technique are framed such that any modification made on the diagram does not alter the input output relation. (8), 2. What is the response c(t) to, the unit step input. What is the response of the, 4. The chart consisting if M & N loci in the log magnitude versus phase diagram is called Nichols chart. (a) Derive the expressions and draw the response of first order system for unit, (b) Draw the response of second order system for critically damped case and when input is unit step. Tags. Define Transfer Function? The steady state error is defined as the value of error as time tends to infinity. Determine the range of k for which closed loop system is stable. Determine the overall transfer function C(S)/R(S) for the system shown in fig. iv) The phase angle curves can be easily drawn if a template for the phase angle curve of. 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. The main draw back of static coefficient is that it does not show the variation of error with time and input should be standard input. The control system in which the output has an effect upon the input quantity so as to maintain the desired output value are called closed loop control system. The two major types of control system are open loop and closed loop. Source #2: advanced control system lab viva questions.pdf FREE PDF DOWNLOAD (a) Nyquist Criterion (b) Quasi linearization (c) Functional analysis (d) Phase-plane representation Ans: a, 79. If the Nyquist plot of the open loop transfer function G(s) corresponding to the nyquist control in the S-plane encircles the critical point –1+j0 in the counter clockwise direction as many times as the number of right half S-plane poles of G(s),the closed loop system is stable. 25.What is the disadvantage in proportional controller? is the frequency at which the magnitude of the open loop transfer function is unity. Control Systems VIVA Questions and Answers :- 1.What is control system? The necessary condition for stability is that all the coefficients of the characteristic polynomial be positive. Consider a type 1 unity feed back system with an OLTF G(S) =K/S (S+1) (S+4). Source: Credits goes to the faculty and staff of Pavendar Bharathidasan Institute of Information Technology. (16), 7. Spring constant in force-voltage analogy is analogous to (a) capacitance (b) reciprocal of capacitance (c) current (d) resistance Ans: b, 64. Which of the following is the definition of proportional band of a controller ? As a result of introduction of negative feedback which of the following will not decrease ? The cut-off rate indicates the ability to distinguish the signal from noise. Positional error constant Velocity error constant Acceleration error constant. Regenerative feedback implies feedback with (a) oscillations (b) step input (c) negative sign (d) positive sign Ans: d, 25. Such approximation is sufficient if rough information on the frequency response characteristic is needed. 13.What is the necessary condition for stability. 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. (10), 13. A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? The components of feedback control system are plant, feedback path elements, errordetector and controller. (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. (8), (ii) Find the static error coefficients for a system whose G(S)H(S)=10/ S(1+S)(1+2S)and also find the, [email protected] www.fb.com/matterhere Nareddula Rajeev Reddy (NRR) [email protected] www.matterhere.com, 10. 1. The type 0 system has ______ at the origin. A good control system has all the following features except (a) good stability (b) slow response (c) good accuracy (d) sufficient power handling capacity Ans: b, 10. The most common example is hearing an unwanted conversation on the telephone. (16), 8. (a) Bode-Nyquist stability methods (b) Transfer functions (c) Root locus design (d) State model representatives Ans: d, 93. Masons Gain formula states that the overall gain of the system is. Z =R 4. Which of the following is the best method for determining the stability and transient response ? The basic elements of block diagram are block, branch point and summing point. A Bode plot consists of two graphs. A control system working under unknown random actions is called (a) computer control system (b) digital data system (c) stochastic control system (d) adaptive control system Ans: c, 13. The Polar plot of a Sinusoidal transfer function G(jω) is a plot of the magnitude of G(jω) versus the phase angle/argument of G(jω) on polar or rectangular co-ordinates as ω is varied from zero to infinity. The PI controller increases the order of the system by one, which results in reducing the steady state error .But the system becomes less stable than the original system. 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. 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. B-Resistance R Mass M- Inductance L Stiffness K-Inverse of capacitance 1/C. Static error coefficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal. (a) Error detector (b) Final control element (c) Sensor (d) Oscillator Ans: d, 39. EmoticonEmoticon. The loops are said to be non touching if they do not have common nodes. An op-amp has a single output and a very high gain, which means that … The order of a system is the order of the differential equation governing the system. ii)Resonant frequency. Which of the following devices is used for conversion of co-ordinates ? Electrical Machines 1 Viva Questions and Answers. Obtain an expression for closed loop transfer function. (8). (i) P.M is atleast 40o , (ii) Steady state error for ramp input ≤ 0.04 rad. 6.When is lag lead compensator is required? 6. Addition of zeros in transfer function causes which of the following ? get the analog lab viva questions with answers member that we present here and check out the link. The frequency domain specification are i)Resonant peak. 11.What is the basis for framing the rules of block diagram reduction technique? The system is to be compensated to meet the following specifications Kv > 5sec and PM > 43 deg. 20.What are two contours of Nichols chart? 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. G(S) = 10/ S(1+0.4S) (1+0.1S) (16). 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. What viva questions can be asked for 1st amp 2nd year. A unity feedback control system has an open loop transfer function, 5. Its portability allows it to run on different hardware platforms. The frequency of applied AC at which resonance takes place or current is maximum. Required fields are marked * Comment. 2. Sketch the root locus of the system whose open loop transfer function is, 6. Leave a Reply Cancel reply. (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. 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. (16). 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. (a) Field controlled D.C. motor (b) Ward leonard control (c) Metadyne (d) Stroboscope Ans: a, 6. Electronics ECE Electrical EEE FAQs Control System Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF Download. Which of the following statements is correct for any closed loop system ? 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. 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