Categories: Third Year First Semester (3-1)

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Code No: RT31043

III B. Tech I Semester Supplementary Examinations, May- 2018

CONTROL SYSTEMS (Common to Electronics and Communication Engineering and Electronics and Instrumentation

Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

(Normal and semi & polar graph sheet are to be supplied)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART ?A

1 a) Explain the limitations of closed loop system over open loop system. [3M]

b) Explain the advantages of signal flow graph over block diagram representation. [4M]

c) What are Effects of proportional integral systems? [4M]

d) What are effects by adding poles in the root locus? [4M]

e) Define gain margin? [4M]

f) What is Obsevability? [3M]

PART -B

2 a) Explain the temperature control system concepts using open loop as well as closed

loop systems

[8M]

b)What is signal flow graph and explain the steps to reduce the system flow graph using

mason gain formulae.

[8M]

3 a) Derive the transfer function of field controlled DC Servo motor. [8M]

b)Obtain the transfer function C(s)/R(s) by using Block diagram algebra for the figure

given below:

[8M]

4 a) For unity feedback system having open loop transfer function as

. Determine error constants K

p

, K

v

and K

a

?

[8M]

b)A unity feedback control system has an open loop transfer function,

Find the rise time, percentage overshoot, peak time and settling time for a step

input of 12 units.

1 of 2

[8M]

R13

SET – 1

R13

SET – 1

|”|”|||”|”’|||’|

Code No: RT31043

III B. Tech I Semester Supplementary Examinations, May- 2018

CONTROL SYSTEMS (Common to Electronics and Communication Engineering and Electronics and Instrumentation

Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

(Normal and semi & polar graph sheet are to be supplied)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

PART ?A

1 a) Explain the limitations of closed loop system over open loop system. [3M]

b) Explain the advantages of signal flow graph over block diagram representation. [4M]

c) What are Effects of proportional integral systems? [4M]

d) What are effects by adding poles in the root locus? [4M]

e) Define gain margin? [4M]

f) What is Obsevability? [3M]

PART -B

2 a) Explain the temperature control system concepts using open loop as well as closed

loop systems

[8M]

b)What is signal flow graph and explain the steps to reduce the system flow graph using

mason gain formulae.

[8M]

3 a) Derive the transfer function of field controlled DC Servo motor. [8M]

b)Obtain the transfer function C(s)/R(s) by using Block diagram algebra for the figure

given below:

[8M]

4 a) For unity feedback system having open loop transfer function as

. Determine error constants K

p

, K

v

and K

a

?

[8M]

b)A unity feedback control system has an open loop transfer function,

Find the rise time, percentage overshoot, peak time and settling time for a step

input of 12 units.

1 of 2

[8M]

R13

SET – 1

R13

SET – 1

|”|”|||”|”’|||’|

Code No: RT31043

5 a) The characteristics equation of feedback control system is

+3

++2+40 . determine the range of K for which system is

stable.

[8M]

b) Plot the root locus pattern of a system whose forward path transfer function is

.

[8M]

6 a) Find the Gain margin and phase margin of the system if the open loop transfer

function is

[8M]

b) The open loop transfer function of a feedback control system is given by

Plot the Nyquist plot and show that the closed loop system is stable if

=2 .

[8M]

7 a) What is lag compensator? [4M]

b)A unity feedback system has an open loop transfer function,

.design a suitable lag compensator so that phase margin is 40

0

and the steady state

error for ramp input is less than or equal to 0.2.

[12M]

*****

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