JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year CONTROL SYSTEMS ENGINEERING Previous Question Paper (May/June - 2019 - R15)
Part A is compulsory. Answer all questions. Part B consists of 5 Units. Answer any one full question from each unit.
PART - A
Give two examples for open loop and closed loop control systems.
Answer
Examples of open loop control systems include an electric toaster and a hand-operated fan. Examples of closed loop control systems include an automatic air conditioner and a voltage stabilizer.
What are the advantages of block diagram reduction technique?
Answer
The block diagram reduction technique simplifies complex control systems into a single transfer function, making it easier to analyze overall system behavior. It provides a visual representation of the signal flow and allows for the systematic elimination of feedback loops and cascading blocks to determine the closed-loop transfer function.
What is mean by steady state error?
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What is damping ratio? Differentiate second order system based on damping ratio.
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Define root locus.
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What are the advantages of R-H criteria?
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What is gain crossover frequency and phase crossover frequency.
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What is nyquist criteria?
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Define controllability.
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Define state, state variable, state vector.
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PART - B
Give the classification of control systems in detail.
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For the signal flow graph shown in figure 1, determine the gain X5/X1 using Mason’s gain formula.
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Mention the merits and demerits of an open-loop and closed-loop control systems.
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Find the transfer function of the network given in figure 2.
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Derive the time response of second order over damped system due to unit step input.
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What are generalized error constants? State the advantages of generalized error coefficients?
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What are the time response specifications? Explain and write the expression for each of them.
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Obtain the root locus plot for the system whose open loop transfer function is given. For what range of ‘K’ the system is stable?
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Investigate the stability of a control system whose characteristic equation is given.
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Explain the effect of adding poles and zeros to G(S)H(S) on the root loci.
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Design a lag compensator for unity feedback system whose open loop transfer function is given to satisfy the following specifications: a) Velocity error constant KV ≥ 50, b) Phase margin ≥ 20 degrees.
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Draw and explain polar plots for type-0, type-1 and type-2 systems.
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Explain the procedure for determination of transfer function from Bode plots.
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A system is described by state space equations. Find the transfer function.
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Considering the vector matrix differential equation describe the dynamics of the system. Determine state transition matrix.
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Explain kalman’s test to check controllability and observability.
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