GATE EE
Control Systems
Root Locus Techniques
Previous Years Questions

## Marks 1

The root locus of unity feedback system is shown in figure The closed loop transfer function of the system is ...
Figure shows the root locus plot (location of poles not given) of a third order system whose open loop transfer function is ...
Which of the following figure(s) represent valid root loci in the $$s$$ - plane for positive $$K?$$ Assume that the system has transfer function with ...
The characteristic equation of a closed-loop system is $$s\left( {s + 1} \right)\left( {s + 3} \right) + \,\,k\left( {s + 2} \right) = 0,\,\,k > 0.... A closed loop system has the characteristic function$$\left( {{s^2} - 4} \right)\left( {s + 1} \right) + K\left( {s - 1} \right) = 0.$$Its root loc... A unity feedback system has an open loop transfer function,$$G\left( s \right) = {K \over {{s^2}}}.$$The root locus plot is ## Marks 5 The open loop transfer function of a unity feedback system is given by$$G\left( s \right) = {{2\left( {s + \alpha } \right)} \over {s\left( {s + 2} \...
Given the characteristic equation $${s^3} + 2{s^2} + Ks + K = 0.$$ Sketch the root focus as $$K$$ varies from zero to infinity. Find the angle and rea...
A unity feedback system has open loop transfer function $$G\left( s \right) = {{K\left( {s + 5} \right)} \over {s\left( {s + 2} \right)}};K \ge 0$$ ...
A unity feedback system has the forward loop transfer function G\left( s \right) = {{K{{\left( {s + 2} \right)}^2}} \over {{s^2}\left( {s - 1} \righ...
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