Elektronik Industri Exam Paper

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UNIVERSITI TUN HUSSEIN ONN MALA YSIA

FINAL EXAMINATION

SEMESTER I

SESSION 2009/2010

S U B J E C T N A M E I N D U S T R I A L E L E C T R O N I C S

S U B J E C T C O D E

C O U R S E

E X A M I N A T I O N D A T E

D U R A T I O N

I N S T R U C T I O N

D E K 3 1 1 3

3 D E E / D E X

N O V 2 0 0 9

2 '/ 2 H O U R S

A N S W E R S F O U R ( 4) Q U E S T I O N S

O N L Y .

THIS PAPER CONSISTS OF 9 PAGES



D E K 3 1 1 3

QL. ( a ) Give s imi l a r i ty be tween s o leno id and r e l ay .

( 3 m a r k s )

( b ) B a s e d o n F i g u r e Q l ( b ) :

( i ) Exp la in the opera t io n o f F igu re Q l (b ) dur ing de-energ ize and

energ ize s t a t e .

( 5 m a r k s )

( i i ) Giv e func t ion o f 15A fus e in the s ys t em .

( 2 m a r k s )

( c ) ( i ) G i v e t w o m e t h o d f o r i m p r o v e m e n t o f so l e n o i d c o n s t r u c t i o n .

( 3 m a r k s )

( i i ) Ex p la in one o f t he me thod fo r imp rove me nt o f s o l eno id

c o n s t r u c t i o n w h i c h n e e d s g r a p h i c a l d i a g r a m t o e x p l a i n .

( A p p r o p r i a t e d i a g r a m n e e d t o b e i n c l u d e d )

( 5 m a r k s )

( d ) F i g u r e Q l ( d ) , s h o w s o n e o f t h e m e t h o d t o p r o l o n g e d t h e li f e t i m e

for s wi t ch o f t he r e l ay .

( i ) Exp la in the opera t ion o f F igure Q1 (d ) wh en t r ans i s to r i n " on "

& " o f f ' c o n d i t i o n .

( 4 m a r k s )

( i i ) W h at wi l l happ en whe n d iode i s no t ex i s t .

( 3 m a r k s )

Q 2 . ( a ) W hen s ens or S I s ens es a con ta iner , a pneumat i c opera t ed va lve wi l l

open and a l lows l iqu id f rom the t ank to f low in to i t . The va lves c los e

au tom at i ca l ly a f t e r t ime de lay o f 5 s econd s . Af t e r t ha t , con ta iner wi l l be

t r ans por t ed to ano ther s t a t ion . T ime de lay s t a r t s when s ens or S I i s

t r iggered . The va lve i s con t ro l l ed by a ro t a ry ac tua to r which i s ac t iva t ed

by a s ing le ac t ing s o leno id . P l eas e r e f e r F igure Q2( a) fo r d i ag ram of th i s

p roces s . Dra w e l ec t r i c d i ag ram for the p roce s s .

(7 marks)

(b ) F igu re Q2(b ) s hows the d r i l l i ng p roc es s o f an ob jec t . I n i t ia l ly , par t s a r e

manual ly p l aced in a r ecep tac l e . W hen PB i s p r es s ed , cy l inder A pus hes a

r ecep tac l e under the d r i l l i ng un i t . Then , cy l inder B wi l l s t a r t t o ex tend .

Dr i l l i ng ope ra t ion s t a r t s once cy l inde r B a t i t f u l l ex ten s ion . Dr i l l i ng

opera t ion opera t e fo r 5 s econd s . Af t e r d r i l l i ng cy l inder A mus t no t

r e tu rn un t i l d r i l l f eed un i t has r eached i t s s t a r t pos i t i on .

2



D E K 3 1 1 3

C yl i n d er A - Single Acting Cylinder (3/2 way valve normally c lose) :

Solenoid for cyl inder A- Y l

C yl i n d er B - Double Acting Cylinder (5/2 way direct ional valve) :

Solenoid for cyl inder B- Y1 and Y2

As s u mp t i o n :

(1) Time for cyl inder A to move from original posi t ion to ful l

extension(or vice versa) is 1 sec .

(2) Time for cyl inder B to move from original posi t ion to ful l

extension(or vice versa) is 2 sec .

(3) Next process wil l not execute unless previous process been

execu ted .

Based on Figure Q2(b):

( i ) Draw a motion diagram for the appl icat ion.

(4 marks )

( i i ) Draw displacement diagram for Cylinder A and Cylinder B and

indicate t ravel ing t ime in the diagram

(4 marks)

( i i i) Draw electr ic diagram for the process

(10 marks )

Q 3. (a) An alarm buzzer wil l sound when the sensor S1 at the front door or thesensor S2 at the back door is act ivate .(When detect movement) . The

alarm buzzer wil l s top when the sensor is de-act ivated (Not detect

movement) . Draw the PLC ladder diagram ( including i ts addresses) and

i ts mnemonic funct ion for this system.

(7 marks )

(b) Figure Q3(b) show a ladder diagram of a system. Write the mnem onic

funct ion of the system.

(8 marks)

(c) Based on Figure Q3(c) , Sensor SI used to detect and count the numb er

of products being carr ied on an assembly l ine . When i t counts three

products , a s ingle act ing cyl inder wil l be extended to push a three

product into a conveyor for packaging. After 3 seconds, the cyl inder wil l

go back to i ts or iginal posi t ion and at the same t ime, reset the

AD DER (empty ing the AD DER ) . Draw ladde r d iag ram fo r the sys tem,

sys tem.

3



D E K 3 1 1 3

No t e :

P lease use DIFU, ADD, CMP and MOV in your so lu t ion .

Need a l loca te spec i fi c address us ing CQ M1 H mode l .

Special re lay: 25313(always on) , 25505(>) , 25506(=) , 25507(<)

(10 marks )

Q 4. (a) Consider the integrator c ircui t in Figure 4(a) . The input s ignal , Vi to

the c ircui t is a 20kHz square wave with 3Vp-p.

(i) Sketch and label th e values of the outpu t s ignal , Vo.

(6 marks )

( i i ) Calculate the frequencies where the c ircui t wil l s top act ing as an

integrator .

(4 marks )

( i i i ) Sketch the output s ignal , Vo whe n i t is not act ing as an integrator and

wha t kind of c ircui t i t is act ing now .

(5 marks )

(b) Fro m Figure 4 (b), all value R and V are s ta ted as below:

R l = 2 k i l , R 2 = 6 k Q , R 3 = 5 k Q , R 4 = 4 k O , R 5 = 8 k £ l , R 6 = 1 5 k O ,

R 7 = 1 0 k Q

V l = l V , V 2 = 2 V

( i ) N am e types of Op Am p from the c ircui t .

(4 marks )

( i i ) Find the value for V3 , V4 and V5

(6 marks )

Q 5.

(a) Elaborate PW M concept in control l ing the speed of s imple motor .

(6 marks )

(b) In term of duty cycle and average output, explain what is the difference

between three diagram in Figure Q5(b) .I r iput s ignal is 12V.

(9 marks )

(c) With an appropria te diagram explain Ful l Step One On operat ion andFull Step Two On operat ion of Stepper motor .

(10 marks )

4



1

D E K 3 1 1 3

F I N A L E X A M I N A T I O NSESSION :S E M I / 2 0 0 9 / 2 0 0 1 0

SUBJE CT: ELEKTRONIK INDUSTRI

C O U R S E :3DEE/DET

SUBJECT CODE : DEK 3113

Batery source

1 5 A

Fuse

i

LHorn

Reay

1 OHorn

swtch

Horn

Let Hand

Horn

Rtlh Hand

F i gu re 01 ( b )

S u p p l y

N o r m a l c u r r e n tw ith t l i iver o n

C u r r e n tw l i en d r i ve rturns o f f

Re la y c o i l

L o o p 1

F i gu re Q l ( d )

5



D EK 3 1 3 3

F IN A L E X A M IN A T IO N

SESSION : SEM 1/2009/20010 COURSE : 3DEE/DET

SUBJ ECT: INDUSTR IAL ELECTRONICSSUBJECT CODE : DEK 3113

R o t a r y

A c t u a t o r

Figure Q2(a)

6



D E K 3 1 1 3

F IN A L E X A M IN A T IO NSESSION : SEM I/2009 /20010 COURSE • 3DEE/DET

SUBJECT : INDUSTRIAL ELECTRONICS SUBJECT CODE : DEK 3113

r e c e p t a c l e

B

Figure Q2(b)

7



D E K 3 1 1 3

F IN A L E X A M IN A T IO NSESSION: SEM 1/2009/2010

SUBJECT: INDUSTRIAL ELECTRONICS

COURSE: 3DEE/DET

SUBJECT CODE: DEK 3113

o . o o

-H h-

O 01

—U H

0.13

—

0.05

— n -

0.03-H h-

0 . 0 1

—I h-

0.02

—i l-

0.07

—P-1-

0.06

0.06

O 13

-H H

0.04

o . o - i—H— 0.02— H -

0.1 2

—I t-

o . o s-I h-

00 9

-H H-

O 06

—I K

o . o s— H -

O 06

— n -

00 4

—U-1-

o.- l o—I I-

1 o o . o o

— o —

F igure 03 (b)

F igure 03 (c )

8



DEK 3113

9



D E K 3 1 1 3

F IN A L E X A M IN A T IO NSESSION: SEM 1/2009/2010 COURSE: 3DEE/DET

SUBJECT. INDUSTRIAL ELECTRONICS SUBJECT CODE: DEK 3113

l a : 1 : 1 m a r k - s p a c e r at io ( 5 0 % d u t y c y c l e )

l b : 3 : 1 m a r k - s p a c e r a ti o ( 7 5 % d u t y c y c l e )

l c : 1 : 3 m a r k - s p a c e r a t i o ( 2 5 % d u t y c y c l e )

F i gu r e 0 5 ( b )

10



D E K 3 1 1 3

F I N A L E X A M I N A T I O NSESSION: SEM1/2009/2010

SUBJECT: INDUSTRIAL ELECTRONICS

COURSE: 3DEE/DET

SUBJECT CODE: DEK 3113

3 V p - p

M5kHz

R 1

10 teQ

Qo k t f l

0 . 0 0 2 2 HF

R F

A / V1 0 0 k o

F i g u r e 0 4 ( a )

R 2

10 kn

v1 O

R1

R2-VsA/V-

R3- m — i

v3

R4V2 Q VAV-

OpAmpI

R5- w w -

R 6

v 4

Op >4mp2

F i g u r e 0 4 ( b )

R7

v 5

OpAmpI

9

Elektronik Industri Exam Paper

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