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Feb 2015.pdf-Total No. of Questions : 6]

Feb_2015.pdf-Total No. of Questions : 6]

Feb 2015.pdf-Total No. of Questions...

Feb_2015.pdf-Total No. of Questions : 6]

##### Page 1

Total No. of Questions : 6]

[Total No. of Pages : 3

APR-15/ENGG.-117

T.E. (Electrical) (In Sem - Semester - II)

CONTROL SYSTEM - I

(2012 Pattern)

Time : 1 Hour]

[Max. Marks : 30

Instructions to the candidates:

1)

Use of non programmable calculator is allowed.

2)

Solve Q1 or Q2, Q3 or Q4, Q5 or Q6.

3)

Figures to the right indicate full marks.

4)

Assume suitable data, if necessary.

P3632

Q1)

a)

Compare open loop and closed loop system.

[4]

b)

Obtain the transfer function of the signal flow graph given below.

[6]

OR

Q2)

a)

Define the following control systems and give example of each.

[3]

i)

Tracking Control System,

ii)

Regulator Control System and

iii)

Feed Forward Control System

b)

Obtain the transfer function of the block diagram given below.

[7]

P.T.O.

SEAT No. :

##### Page 2

ENGG.-117

2

Q3)

a)

What is a lag network? Obtain the transfer function of lag network.

[4]

b)

Obtain the block diagram representation of armature control DC servo

motor with output as angular velocity (

W

) and input as armature voltage

(

V

a

). Consider following parameters for transfer function

R

a

-Armature

resistant (ohm),

L

a

-armature inductance (H),

V

a

-Armature voltage (V),

E

b

-Back emf (V),

l

a

-armature current (A),

W

-Angular velocity (rad/sec),

T

-Torque (Nm),

J

-Moment of inertia (Kg m

2

), K

t

-back emf and torque

constant (Vsec/rad), B-load torque friction constant.

[6]

OR

Q4)

a)

Explain AC servomotor working characteristics features and its transfer

function.

[6]

b)

Explain potentiometer and potentiometer as error detector. Obtain the

transfer function of potentiometer.

[4]

Q5)

a)

Write short note on dominant closed loop poles of higher order system.

[3]

b)

Consider the system given below. Obtain closed loop transfer function

and determine (i) Rise time, (ii) Peak Time, (iii) Maximum Overshoot

(iv) Settling time and (v)Delay Time.

[7]

2

136

()

16

136

Gs

s

s

=

+

+

OR

Q6)

a)

Draw the standard test signals. Write their mathematical representations

and Laplace transform.

[4]

b)

A second order system is represented by the transfer function

2

()

1

()

WS

TS

Js

fs

k

=

+

+

##### Page 3

ENGG.-117

3

A step input of 10 Nm is applied to the system and the test results are

(i) Maximum overshoot 6 %, (ii) Peak time 1 sec, (iii) Steady state

value of output is 0.5 rad. Determine values of

J

,

f

and k.

[6]

===

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