JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II CONTROL THEORY Previous Question Paper (December - 2018 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Draw the general block diagram of an automatic control system.
Answer
The general block diagram consists of an input R(s), a summing point, a controller Gc(s), a plant G(s), and a feedback path H(s) returning the output C(s) to the summing point to produce an error signal E(s) = R(s) - B(s).
Give three examples each for open-loop and closed-loop control systems.
Answer
Open-loop examples: Electric toaster, automatic washing machine (timer-based), and traffic signal system. Closed-loop examples: Air conditioner with thermostat, human body temperature control, and automatic voltage stabilizer.
What is the effect of derivative control action on system performance?
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Define rise time, delay time and peak time along with the expressions.
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What are the effects of adding a zero to a system?
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State the method of determining the gain K at a point on root locus.
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Define Nyquist stability criterion.
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What is the correlation between phase margin and damping factor?
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What are the frequency domain specifications needed to design a control system?
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What is meant by parallel compensation?
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Part B
Define the following: i) Comparator ii) Linear system.
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Consider an open-loop street light system. How will you convert it in to closed loop system? Discuss in detail.
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Show that Figure 1(b) is the analogous electrical network for the system shown in Figure 1(a) using force-voltage analogy.
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Tabulate the steady state errors of Type-0, Type-1 and Type-2 systems for unit step, unit ramp and unit parabolic input signals.
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Discuss the effect of Integral control actions on system performance with an example.
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The block diagram of a system shown in Figure 2. Determine the value of k such that the damping ratio is 0.5. For the same value of k, obtain rise time (tr), peak time (tp), maximum overshoot (Mp) and settling time (ts) in the unit-step response.
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Write the step-wise procedure to construct root loci for systems with transport lag.
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Sketch the root locus plot of a unit feedback system with the open loop transfer function
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Explain the effect of addition of a pole to the transfer function of using polar plot of a given system.
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Comment on the stability of a closed loop system whose open-loop transfer function is
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Plot the Bode diagram for the following transfer function and obtain the gain and phase cross over frequencies.
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Draw the pole-zero plot of lag compensator.
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Design a lead compensator using root locus for the system with
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Realize the basic compensators using electrical network and obtain their transfer function.
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