B B7035
Total Pages: 2
Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: EE303
Course Name: LINEAR CONTROL SYSTEMS (EE)
Max. Marks: 100 Duration: 3 Hours
Graph sheet and semi-log sheets will be supplied. Assume any missing data.

PARTA
Answer all questions, each carries 5 marks.
1 Distinguish between open loop system and closed loop system. (5)
2 Obtain the transfer function of an AC tachogenerator. (5)
3 A unity feedback system has a open loop transfer function of G(s) = ततान (5)
Determine the steady state error for unit step input.
4 What is angle criterion referred to root locus? (5)
5 Define gain margin and phase margin of a system. (5)
6 Determine the phase cross over frequency of a system with open loop transfer (5)
⋅ 1
function G(s) = ततत
7 Write a short note on Nichols chart. (5)
8 Explain the Nyquist stability criterion. (5)
PART B
Answer any two full questions, each carries 10 marks.
9 a) Obtain the force voltage analogy of a general mechanical translation system. (5)

b) Find the overall transfer function of the signal flow graph shown in Figure (1) (5)
using Mason’s gain formula.

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10 a) Obtain the transfer function of an armature controlled DC motor. (5)
b) The forward path transfer function of a unity feedback control system is given by (5)
G(s) = s(s+3)° Obtain an expression for unit step response of the system.

11 a) Explain the effect of time constant on the speed of time response of a control (4)
system.
b) Obtain the electrical analogous of the mechanical system shown in Figure (2). (6)
Use force-voltage analogy.

B, B, Figure (2)

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