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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: EE303
Course Name: LINEAR CONTROL SYSTEMS
Max. Marks: 100 Duration: 3 Hours

(Graph sheets and semi-log graph sheets will be provided)

PART A
Answer all questions, each carries5 marks. Marks
1 Obtain the transfer function of series RLC circuit. Take voltage across capacitor (5)

as the output voltage.

2 Explain the working principle of a synchro used as an error detector ina control (5)
circuit.

3 Consider a unity feedback system with transfer function G(s) = വി (5)
the velocity error constantof the system with K=1. What will be the velocity error
constant of the same system after adding a zero at s = -4?

4 How is the root locus technique useful in the analysis of a control system? (5)

5 How gain margin and phase margin values help in studying relative stability ofa (5)
system?

6 The asymptotic bode plot of a transfer function is shown in figure. Obtain the (5)

transfer function G(s) corresponding to this bode plot.

|H(jw)| in dB

دوہ

-20

7 Write a short note on Nichols chart. (5)