PART A(10*2=20)
Answer All Questions:
1.What are the advantages of the
closed loop control system?
2.Why negative
feedback is invariably preferred in a closed loop system?
3.Write the Mason’s
gain formula of signal flow graph.
4.The closed loop
transfer function of a second order system is given by 400/s2+2s+400.Determine
the damping ratio and natural frequency of oscillation.
5.Write the
necessary and sufficient condition for stability in Routh stability criterion.
6.Define sampling
theorem.
7.How will you find
root locus on real axis?
8. Why derivative
controller is not used in control systems?
9.Define phase
margin and gain margin.
10. What is
centroid?
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