JNTU
JNTU B.Tech III CONTROL SYSTEMS ENGINEERING Previous Question Paper (January/February - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Why is negative feedback invariably preferred in a closed loop system?
Answer
Negative feedback is preferred because it reduces system sensitivity to parameter variations, minimizes the effect of external disturbances, and improves overall system stability by reducing the closed-loop gain, which allows for a wider bandwidth.
Write the importance of Signal flow graph in control systems.
Answer
A signal flow graph provides a graphical representation of a system of linear algebraic equations. It simplifies the process of finding the transfer function of complex systems using Mason’s Gain Formula, avoiding the algebraic complexity associated with block diagram reduction.
What is the time response of the first order system?
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What are the test signals?
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Discuss asymptotes.
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What are the limitations of Routh Hurwitz criteria?
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What is lag compensator?
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Define phase margin.
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Define controllability.
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Explain: i) State ii) State variables iii) State space representation.
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Part B
Find the transfer function of the system represented by the following figure.
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Write the difference between open loop and closed loop systems.
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What is feedback? Explain the effects of feedback.
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Find out the output of the critically damped second order system when the input applied to the system is unit step input.
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Define time domain specifications.
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Explain error constants Kp, Kv and Ka for type II system.
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Explain the effect of PD control on the performance of control system.
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A unity feedback control system has an open loop transfer function G(S) = K / [s(s2+4s+13)]. Find i) Angle of asymptotes, centroid ii) Angle of departure.
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How many roots of the following polynomial are in the right half, left half of s-plane and on the jω axis. P(s) = s4 + 2s3 + 3s2 + 4s + 5.
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Draw the root locus for the unity feedback system whose open loop transfer function is G(s) = K / [s(s+2)(s+4)]. Find the range of k for which the system is stable.
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Draw and explain polar plots for type-0, type-1 and type-2 systems.
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Enlist the step-by-step procedure for the construction of Nyquist plots.
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Explain the different steps to be followed for the design of lead compensator using Bode plot.
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Write short notes on PID controllers.
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Develop the state model for a system characterized by the following differential equation: d3y/dt3 + 6d2y/dt2 + 11dy/dt + 6y = u(t).
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Discuss the significance of state Space Analysis.
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Given the transfer function of the system. Write the state variable model.
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State and prove the properties of state transition matrix.
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