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UNIVERSITI TUN HUSSEIN ONN MALAYSIA FINAL EXAMINATION SEMESTER I SESSION 2009/2010 SUBJECT NAME INDUSTRIAL ELECTRONICS SUBJECT CODE COURSE EXAMINATION DATE DURATION INSTRUCTION DEK3113 3 DEE/DEX NOV 2009 2 '/ 2 HOURS ANSWERS FOUR (4) QUESTIONS ONLY. THIS PAPER CONSISTS OF 9 PAGES

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Page 1: Dek3113 0910

UNIVERSITI TUN HUSSEIN ONN MALAYSIA

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 2009

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

Page 2: Dek3113 0910

DEK 3113

QL. (a) Give similarity between solenoid and relay. (3 marks)

(b) Based on Figure Ql(b) : (i) Explain the operation of Figure Q l (b) during de-energize and

energize state. (5 marks)

(ii) Give function of 15A fuse in the system. (2 marks)

(c) (i) Give two method for improvement of solenoid construction. (3 marks)

(ii) Explain one of the method for improvement of solenoid construction which needs graphical diagram to explain. (Appropriate diagram need to be included)

(5 marks) (d) Figure Ql(d) , shows one of the method to prolonged the life time

for switch of the relay.

(i) Explain the operation of Figure Q1 (d) when transistor in "on" & " o f f ' condition.

(4 marks) (ii) What will happen when diode is not exist.

(3 marks)

Q2. (a) When sensor SI senses a container, a pneumatic operated valve will open and allows liquid from the tank to flow into it. The valves close automatically after time delay of 5 seconds. After that, container will be transported to another station. Time delay starts when sensor SI is triggered. The valve is controlled by a rotary actuator which is activated by a single acting solenoid. Please refer Figure Q2(a) for diagram of this process. Draw electric diagram for the process.

(7 marks)

(b) Figure Q2(b) shows the drilling process of an object. Initially, parts are manually placed in a receptacle. When PB is pressed, cylinder A pushes a receptacle under the drilling unit. Then, cylinder B will start to extend. Drilling operation starts once cylinder B at it full extension. Drilling operation operate for 5 seconds. After drilling cylinder A must not return until drill feed unit has reached its start position.

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Page 3: Dek3113 0910

DEK 3113

Cylinder A - Single Acting Cylinder (3/2 way valve normally close): Solenoid for cylinder A-Yl

Cylinder B - Double Acting Cylinder (5/2 way directional valve): Solenoid for cylinder B- Y1 and Y2

Assumption: (1) Time for cylinder A to move from original position to full

extension(or vice versa) is 1 sec. (2) Time for cylinder B to move from original position to full

extension(or vice versa) is 2 sec. (3) Next process will not execute unless previous process been

executed.

Based on Figure Q2(b):

(i) Draw a motion diagram for the application. (4 marks)

(ii) Draw displacement diagram for Cylinder A and Cylinder B and indicate traveling time in the diagram

(4 marks) (iii) Draw electric diagram for the process

(10 marks)

Q3. (a) An alarm buzzer will sound when the sensor S1 at the front door or the sensor S2 at the back door is activate.(When detect movement). The alarm buzzer will stop when the sensor is de-activated (Not detect movement). Draw the PLC ladder diagram (including its addresses) and its mnemonic function for this system.

(7 marks)

(b) Figure Q3(b) show a ladder diagram of a system. Write the mnemonic function of the system.

(8 marks)

(c) Based on Figure Q3(c), Sensor SI used to detect and count the number of products being carried on an assembly line. When it counts three products, a single acting cylinder will be extended to push a three product into a conveyor for packaging. After 3 seconds, the cylinder will go back to its original position and at the same time, reset the ADDER(emptying the ADDER). Draw ladder diagram for the system, system.

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Page 4: Dek3113 0910

DEK 3113

Note: Please use DIFU, ADD, CMP and MOV in your solution. Need allocate specific address using CQM1H model. Special relay: 25313(always on), 25505(>), 25506(=), 25507(<)

(10 marks)

Q4. (a) Consider the integrator circuit in Figure 4(a). The input signal, Vi to the circuit is a 20kHz square wave with 3Vp-p.

(i) Sketch and label the values of the output signal, Vo. (6 marks)

(ii) Calculate the frequencies where the circuit will stop acting as an integrator.

(4 marks) (iii) Sketch the output signal, Vo when it is not acting as an integrator and

what kind of circuit it is acting now. (5 marks)

(b) From Figure 4(b), all value R and V are stated as below:

R l = 2 k i l , R2=6kQ , R3 =5kQ, R4=4kO, R5=8k£l, R6=15 kO , R7=10kQ V l = l V , V2=2 V

(i) Name types of Op Amp from the circuit. (4 marks)

(ii) Find the value for V3, V4 and V5 (6 marks)

Q5. (a) Elaborate PWM concept in controlling the speed of simple motor.

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

between three diagram in Figure Q5(b).Iriput signal is 12V. (9 marks)

(c) With an appropriate diagram explain Full Step One On operation and Full Step Two On operation of Stepper motor.

(10 marks)

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Page 5: Dek3113 0910

1

DEK 3113

FINAL EXAMINATION SESSION : SEMI/2009/20010 SUBJECT: ELEKTRONIK INDUSTRI

COURSE : 3DEE/DET SUBJECT CODE : DEK 3113

Battery source

1 5 A Fuse

i

L Horn Relay

1 O Horn switch

Horn Left Hand

Horn Ritlht Hand

Figure 01(b)

S u p p l y

N o r m a l c u r r e n t w i t h t l i i ve r o n

C u r r e n t w l i e n dr iver t u r n s o f f

R e l a y c o i l

L o o p 1

Figure Ql(d)

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Page 6: Dek3113 0910

DEK 3 1 3 3

FINAL EXAMINATION SESSION : SEM 1/2009/20010 COURSE : 3DEE/DET SUBJECT: INDUSTRIAL ELECTRONICS SUBJECT CODE : DEK 3113

Rotary Actuator

Figure Q2(a)

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Page 7: Dek3113 0910

DEK 3113

FINAL EXAMINATION SESSION : SEMI/2009/20010 COURSE • 3DEE/DET SUBJECT : INDUSTRIAL ELECTRONICS SUBJECT CODE : DEK 3113

receptacle

B

Figure Q2(b)

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Page 8: Dek3113 0910

DEK 3113

FINAL EXAMINATION SESSION: SEM 1/2009/2010 SUBJECT: INDUSTRIAL ELECTRONICS

COURSE: 3DEE/DET SUBJECT CODE: DEK 3113

o . o o -H h-O 01 —UH 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-0 0 9 -H H-

O 06 —I K o . o s —H-

O 06 —n-004 —U-1-o.-l o —I I-

1 o o . o o —o—

Figure 03(b)

Figure 03(c)

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Page 9: Dek3113 0910

DEK 3113

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Page 10: Dek3113 0910

DEK 3113

FINAL EXAMINATION SESSION: SEM 1/2009/2010 COURSE: 3DEE/DET SUBJECT. INDUSTRIAL ELECTRONICS SUBJECT CODE: DEK 3113

l a : 1:1 mark-space ratio ( 5 0 % duty cycle)

l b : 3:1 mark-space ratio ( 7 5 % duty cyc le )

l c : 1 : 3 mark-space ratio ( 2 5 % duty cyc le)

Figure 05(b)

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Page 11: Dek3113 0910

DEK 3113

FINAL EXAMINATION SESSION: SEM1/2009/2010 SUBJECT: INDUSTRIAL ELECTRONICS

COURSE: 3DEE/DET SUBJECT CODE: DEK 3113

3Vp-p M5kHz

R 1 10 teQ

Qo k t f l

0.0022 HF R F

A / V 1 0 0 k o

Figure 04(a)

R 2 10 kn

v1 O R1

R2 -VsA/V-

R3 - m — i

v3

R4 V 2 Q VAV-

OpAmpI

R5 - w w -

R 6

v4 Op >4mp2

Figure 04(b)

R7

v5 OpAmpI

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