VCE VET INTEGRATED TECHNOLOGIES - vcaa.vic.edu.au

S A M P L EVCE VET INTEGRATED TECHNOLOGIES

Written examination

Day Date Reading time: *.** to *.** (15 minutes) Writing time: *.** to *.** (1 hour 30 minutes)

QUESTION AND ANSWER BOOK

Structure of bookSection Number of

questionsNumber of questions

to be answeredNumber of

marks

A 20 20 20B 11 11 80

Total 100

• Studentsarepermittedtobringintotheexaminationroom:pens,pencils,highlighters,erasers,sharpeners,rulersandonescientificcalculator.

• StudentsareNOTpermittedtobringintotheexaminationroom:blanksheetsofpaperand/orcorrectionfluid/tape.

Materials supplied• Questionandanswerbookof26 pages• Detachableinsertofmiscellaneousformulasinthecentrefold• Answersheetformultiple-choicequestions

Instructions• Writeyourstudent numberinthespaceprovidedaboveonthispage.• Checkthatyournameandstudent numberasprintedonyouranswersheetformultiple-choice

questionsarecorrect,andsignyournameinthespaceprovidedtoverifythis.• Unlessotherwiseindicated,thediagramsinthisbookarenotdrawntoscale.• AllwrittenresponsesmustbeinEnglish.

At the end of the examination• Placetheanswersheetformultiple-choicequestionsinsidethefrontcoverofthisbook.• Youmaykeepthedetachedinsert.

Students are NOT permitted to bring mobile phones and/or any other unauthorised electronic devices into the examination room.

©VICTORIANCURRICULUMANDASSESSMENTAUTHORITY2017

April2017

STUDENT NUMBER

Letter

SUPERVISOR TO ATTACH PROCESSING LABEL HEREVictorian Certificate of Education Year

VETINTEGTECH(SAMPLE) 2 April2017

SECTION A – continued

Question 1JoiningtwodissimilarmetalstogetherisknownasA. brazing.B. welding.C. soldering.D. jointingelectricalcables.

Question 2EnergySafeVictoria(ESV)istheindependenttechnicalregulatorresponsibleforA. thedesignofwindgeneratorsandsolarpanels.B. electricity,gasandpipelinesafetyinVictoria.C. issuingsmall-scalerenewableenergycertificates.D. updatingtheelectricalwiringrulesAS/NZS3000:2007.

Question 3ASafeWorkMethodsStatement(SWMS)isusedA. onlyonce,whenstartinganewjob.B. insteadofstandardoperatingprocedures(SOP).C. toidentifyhazardsandriskswhenperformingajobatanylocation.D. toidentifyhigh-riskconstructionworkhazardsandrisksataworklocation.

Question 4Wheninstallingnewequipmentatasite,theterm‘sustainability’isusedtodescribetheA. lifecycleoftheequipment.B. clean-upanddisposaloftoolsandwaste.C. MeanTimeBetweenFailure(MTBF)oftheequipment.D. carefulmanagementoftheuse,re-useandrecyclingofmaterials,toolsandwaste.

Question 5Whensolderingandrepairinganelectroniccircuitboard,whichoneofthefollowingproceduresisusedtoprotecttheelectroniccomponentsfromdamage?A. Wearrubbergloveswhenhandlingthecircuitboard.B. Useasolderingironatatemperatureoflessthan275°C.C. Preventelectrostaticdischarge(ESD)bywearingawriststrapconnectedtoearth.D. DonotremovethecircuitboardfromothercomponentsinordertopreventESD.

SECTION A – Multiple-choice questions

Instructions for Section AAnswerallquestionsinpencilontheanswersheetprovidedformultiple-choicequestions.Choosetheresponsethatiscorrectorthatbest answersthequestion.Acorrectanswerscores1;anincorrectanswerscores0.Markswillnotbedeductedforincorrectanswers.Nomarkswillbegivenifmorethanoneansweriscompletedforanyquestion.Unlessotherwiseindicated,thediagramsinthisbookarenotdrawntoscale.

April2017 3 VETINTEGTECH(SAMPLE)

SECTION A – continuedTURN OVER

Question 6

Source:SlavoljubPantelic/Shutterstock.com

Inamarineenvironment,whenconnectingwirestoascrew-typeterminalstrip,shownabove,thebestconnectionisachievedbyA. strippingtheinsulation,tinningthewirewithsolder,thenconnecting.B. strippingtheinsulationoftinnedcopperwire,twistingit,thenconnecting.C. usingnon-tinnedcopperwire,strippingandtwistingthewire,thenconnecting.D. insertinginsulatedwireintotheterminalandscrewingtightly,cuttingthroughtheinsulation.

Question 7

B

C

E

Thetransistorsymbolaboveshowsanarrowheadontheleadlabelled‘E’.ThearrowheadinatransistorsymbolpointstoA. wherethebaseisconnected.B. thedirectionofelectroncurrentflow.C. thedirectionofconventionalcurrentflow.D. wherethepositivevoltagesupplyisconnected.



Question 8

Source:OlegSam/Shutterstock.com

Anew230VACcircularsawpurchasedfortheworkplaceisremovedfromitsboxforthefirsttime.Whichprocedureshouldbecarriedoutpriortoitsuse?A. CarefullyreadtheSOP,pluginthecircularsawandoperate.B. ReadtheSOP,wearthecorrectpersonalprotectiveequipment(PPE),checkthelead,pluginthecircular

sawandoperate.C. WearthecorrectPPE,checkthelead,pluginthecircularsawandoperate.D. ReadtheSOP,wearthecorrectPPE,checkandtagthecircularsaw,pluginthecircularsawand

operate.



Question 9

start

no

yes

A = 2(0.5 s)

toggle LED(0.5 s)

A = A – 1(0.5 s)

A = 0?(0.5 s)

Theflowchartaboveshowstheoperationofamicrocontrollerthatisrepeatedlyflashing(toggling)a light-emittingdiode(LED)lightONandOFF.InitiallytheLEDlightisOFF.Ifeachblocktakes0.5stoexecute,howlongwilltheLEDlightbeON?A. 3sB. 2sC. 3.5sD. 30s



Question 10

ACPU

B

address bus

data bus

CRAM

DI/O

clockgen

Thediagramaboveshowsabasicblockdiagramofamicrocontrollersystem.Whatisblock‘B’?A. DRAMB. SRAMC. ROMD. PIA

Question 11A4-bitbinaryvalueis1100.Whatareitsdecimalandhexadecimalequivalentsrespectively?A. 12,0CHB. 03,03HC. 12,00HD. 24,18H

Question 12Amicrocontrollersendsacharactertoaliquidcrystaldisplay(LCD)inASCIIcode.RefertotheASCIIcodechartintheformulasheet.Ifthecharacter‘R’issent,whichofthefollowinggivesthehexadecimalandbinarycodesof‘R’respectively?A. 25H,00100101bB. 52H,01010010bC. 52H,00110100bD. 72H,01110010b



Question 13Regulationsrequirethatalicensedelectricianinstallsfixedlow-voltage(LV)wiringandappliancesinanybuilding.WhichofthefollowinggivestheACandDCvoltagelevelsforLV?

AC voltage level DC voltage level

A. 50–1000VAC 120–1500VDC

B. <50VAC < 120 VDC

C. > 1000 VAC >1500VDC

D. 0–400VAC 0–500VDC

Question 14

A+

–B

Sixsolarpanelsareconnectedasshownabove.Ifeachpanelproduces36VDCatmaximumirradiance,whatwillbetheoutputvoltagebetweenterminals AandB?A. 36VDCB. 108 VDCC. 216VDCD. 230VDC



Question 15Acrystaloscillatorisanelectroniccircuitthatproducesasinewaveatthecrystal’sresonantfrequency.Whichoneofthefollowingistrueofacrystaloscillator?A. Itislessstablewhenaffectedbyheat.B. Itisaneffectivepulsewidthmodulator.C. Itismorestablethanothertypesofoscillators.D. Itchangesfrequencywithpowersupplychanges.

Question 16VehicleparkingsensorsuseanultrasonictransducertotransmitA. acontinuousUHF850MHzsignal,receivinganechoifanobjectisinthepath.B. shortburstsofUHF433MHzsignal,thenreceivinganechoifanobjectisinthepath.C. acontinuousultrasonic40kHzsignal,receivinganechoifanobjectisinthepath.D. shortburstsofultrasonic40kHzsignal,thenreceivinganechoifanobjectisinthepath.

Question 17Filtersaredesignedformanyelectricalandelectroniccircuits.Anelectromagneticinterference(EMI)filterwouldbefoundA. intheprobesofadigitalmultimeter.B. inalow-passfilternetworkforasubwooferamplifier.C. onapowerinputleadorthemainspowerinputtoapowersupply.D. inaudiospeakercross-overunitstobalancetweeters,mid-rangespeakersandwooferspeakers.


END OF SECTION ATURN OVER

Question 18

d0 4–20 mA

d1digital-to-analogue

converter(DAC)

flowcontrol

valved2

d3

Thediagramaboveshows4-bitdata(d3tod0)fromaprogrammablelogiccontrollerconnectedtoa digital-to-analogueconverter(DAC)tocontrolaflowcontrolvalveinafoodprocessingplant.Whenthesettingsford3tod0are0000,theoutputcurrentis4mA.Whenthesettingsford3tod0are1111,theoutputcurrentis20mA.Whichofthefollowingsettingsford3tod0wouldproducethecorrespondingoutputcurrentgiven?

d3 d2 d1 d0settings

Output current

A. 0 0 1 1 3.2mA

B. 1 0 1 1 15.7mA

C. 0 1 1 1 7.5mA

D. 1 1 0 0 8.3mA

Question 19AcommoncharacteristicimpedanceforaCAN-buscableis120Ω.ThecharacteristicimpedancecanbedescribedasA. notabletobemeasured.B. measurablewhenoneendofthecableisshorted.C. theresistanceofacablenotgreaterthan1kminlength.D. theeffectoninductanceandcapacitanceforacableofinfinitelength.

Question 20Whendataistransmittedalongacabletheterm‘attenuation’isused.AttenuationofthesignalstrengthisA. causedbycablelosses.B. theimpedanceofthecable.C. theACresistanceofthecable.D. constantthroughoutthefrequencyspectrum.


SECTION B – Question 1–continued

SECTION B

Instructions for Section BAnswerallquestionsinthespacesprovided.Formulasmustberelevanttothecalculations.Calculationsmustbeshown.Allunitsmustbespecifiedincorrectengineeringnotationintheanswers.Unlessotherwiseindicated,thediagramsinthisbookarenotdrawntoscale.

Question 1 (6marks)Figure1showstheschematicdiagramofalight-emittingdiode(LED)driverboard.

C

–

+12 V

EB

P1

D1

R2

R1

Q1

Figure 1


SECTION B – continuedTURN OVER

Figure2showstheincompleteprintedcircuitboard(PCB)artworkfortheLEDdriverboard.

OnFigure2,drawalloftheconnectionsrequiredtoensurethePCBwilloperateaspertheschematicdiagramshowninFigure1.

C

E

B

P1

D1

R1 Q1

–

+

R2

Figure 2


SECTION B – continued

Question 2 (6marks)Figure3showssomecommonlyusedflowchartboxes.

Figure 3

Thefollowingsequencedescribeshowatop-loaderwashingmachinefillswithwateraspartofthewashingmachine’scycle:Step1–Themachinereadsthedataforthewaterlevelfromthetransducer.Step2–Ifthewaterlevelisat‘medium’,themachineturnsoffthewaterinletsolenoidandcontinues.

Ifthewaterlevelisbelow‘medium’,themachineturnsonthewaterinletsolenoid,thenchecksthewaterlevelagain.Thiswilloccuruntilthewaterinthemachine’sbowlisatthe‘medium’fillsetting.

UsingonlythefiveflowchartboxesshowninFigure3,drawaflowchartinthespaceprovidedbelow,showingthewashingmachineoperationdescribedinStep1andStep2.Drawandlabeleachflowchartboxandallinterconnections.



Question 3 (5marks)Figure4showstheoutputgraphofanACwaveformfromanoscilloscope.

5 10 15 20 25 30 35 40 45 50

–15

–10

–5

0

5

10

15

voltage (V) time (ms)

Figure 4

UsingtheoutputgraphinFigure4,findthefollowingvalues.

• Thepeakvoltage(Vpeak)

• Thepeak-to-peakvoltage(Vp–p)

• TheRMSvoltage(VRMS)

• Theperiodofthewave(T )

• Thefrequencyofthewave(f )



Question 4 (8marks)RefertothecircuitdiagramshowninFigure5.

VS = 15 VACR2100 Ω

R1 220 Ω

R3 150 Ω

AC

I

Figure 5

a. Findthetotalresistanceofthecircuit(Rtotal).Showyourworking. 1mark

b. Findthesupplycurrent(I ).Showyourworking. 2marks

c. FindthevoltageacrossresistorR1(VR1).Showyourworking. 2marks

d. Findthetotalpowerdissipatedbythecircuit.Showyourworking. 2marks

e. IfresistorR1isa14Wresistor,wouldthecircuitoperatenormally?Justifyyouranswer. 1mark




VS = 15 VACR2

47 ΩR1

22 Ω

AClamp 12 V 6 W

IS

I1 I2 I3

Figure 6

a. Findthesupplycurrent(Is).Showyourworking. 4marks

b. Whatisthetotalpower(Ptotal)consumedbythecircuit? 2marks




VS = 24 V

R1 100 ΩItotal

R21.2 kΩ

R35.6 kΩ

I1 I2

+

–

Figure 7

a. Findthetotalresistanceofthecircuit(Rtotal).Showyourworking. 2marks

b. FindthevoltageacrossresistorR3(VR3).Showyourworking. 2marks


SECTION B – Question 7–continuedTURN OVER

Question 7 (16marks)Figure8showsaconventionalDCpowersupply.

A

NE

S1 F1

T1

230 VAC

D1 D2

D4D3

5600 µF

LM7815X 1

+

C1 C2

100 nF

C3 C4

100 nF

Y

2

3

+1 µF

F2

D5

R1 load

Figure 8

a. ThetransformerT1isconnectedtothe230VACmainsinput.

i. WhatistheprincipalfunctionofthetransformerT1? 1mark

ii. GiventhewindingsNp=2000turnsandNs=174turns,findthesecondaryvoltage.Showyourworking. 2marks

b. TheVfofeachdiodeis0.7V.

Whatwillbethecombinedvoltagedropcausedbythebridgerectifierforeachcycle? 2marks



c. Figure9showsapolarisedelectrolyticcapacitorof5600µF.

Source:DannyIacob/Shutterstock.com

Figure 9

Statetwowaysofidentifyingthenegativeleadofthecapacitor. 2marks

1.

2.

d. Express10000nFinmicrofarads. 1mark

µF

e. TheregulatorisanLM7815type.

Whatoutputvoltagewillbeprovidedbythisregulator? 1mark

f. Inthecontextof3-terminalregulators,whatismeantbytheterm‘dropoutvoltage’(Vdrop)? 1mark



g. ThevoltageacrosstheLEDD5is1.5Vandthenominalcurrentthroughitis20mA.

i. WhatisthepurposeofresistorR1? 1mark

ii. WhatisthevalueofresistorR1?Showyourworking. 2marks

h. Ifa15Wloadisconnectedtotheoutput,whatcurrentratingshouldbeselectedforfuseF2? 2marks

i. Toexpandthecapabilityofthepowersupply,anotherregulator,providingavariable5–30VDC,istobeconnectedacrosspointsXandY.

Identifyoneissuethatwouldcreateaproblemifsuchamodificationwereimplemented. 1mark



Question 8 (10marks)a. Nameeachofthedigitallogicgatesshownbelowandcompletethetruthtableforeachgatein

thetableprovided. 4marks

• Nameofgate

A

B

Q

B A Q

0 0

0 1

1 0

1 1

• Nameofgate

A

B

Q

B A Q

0 0

0 1

1 0

1 1



b. Asimplelogiccircuitistobebuiltforatwo-handedmachineswitchsystem.Themachineisaguillotineusedtocutpaper,sobothhandsmustbeonthestartswitchesforittooperate.

Thecontrolsystemhasfourinputs:I0,I1,I2andI3.Ithasoneoutput,Q. Inputs

• I0isamomentaryfootswitchtoenablethemachineforoperation.TheswitchmustbeLogic1toenablethemachinetooperate.

• I1Start1andI2Start2aremomentarypush-buttonswitches.Bothswitchesmustbe Logic1tostartthemachine.

• I3isamushroom-typeE-stopswitch.TheswitchmustbeLogic1fornormalmachineoperation.Logic0stopsthemachine’sfunction.

Output QisconnectedtothemaincontrolandmustbeLogic1forthemachinetostartoperating.

i. Basedontheinformationgivenabove,completethetruthtablebelowforthecontrolsystem.‘X’inthetruthtablereferstoeitherLogic1orLogic0. 3marks

I3(emergency

stop)

I2(left-hand

Start2 switch)

I1(right-hand

Start1 switch)

I0(foot switch)

Q(machine operate)

0 X X X 0

1

1

1

1

1

1

1

ii. Drawthelogicgatecircuitforthetwo-handedmachineswitchsysteminthespaceprovidedbelow.Usethecorrectgatesforthecontrolsystemtooperate. 3marks



Question 9 (6marks)Figure10showsamicrocontrollersystemthatmonitorsthelevelofwaterina5000Lwatertankandtransmitsthetank’swaterlevelstatusdatatoaremotecentralfacility.Apressuretransducerisusedtomeasurethetank’swaterlevel.

A

water tank

pressuretransducer

microcontroller

433 MHzASK transmitter

Figure 10

a. Thewatertank’sstatusdataistransmittedtotheremotecentralfacilityusinga433MHzASKtransmitter.

Whatdoestheacronym‘ASK’mean? 1mark



Figure11showsagraphoftransduceroutputvoltageagainsttheamountofwaterinthewatertank.

50

40

30

20

10

00 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

voltage(mV)

water (L)

Figure 11

b. Basedonthegraphabove,whatwillbetheoutputvoltageofthetransducerifthetankishalffull? 1mark

c. RefertoFigure10andFigure11.Theoutputofthedevicelabelled‘A’inFigure10isconnectedtotheanalogueinputofthemicrocontroller.Theanalogueinputrequires0V(tankempty)to5V(tankfull).

DescribethefunctionofdeviceAandtheeffectitwouldhaveonthesystem. 3marks

d. Nameanothertypeoftransducerthatcouldbeusedtomeasuretheamountofwaterinthetank. 1mark



Question 10 (9marks)Figure12showsacircuitthatincludesaninductor.

10 VS1

R

10 Ω

– +L1

2 H

Figure 12

a. WhatisthetimeconstantforthecircuitshowninFigure12? 2marks

b. Nameonepropertyofaninductorthatdeterminesitsinductance. 1mark



c. ForthecircuitshowninFigure12,drawthecurrentwaveformfromtheinstanttheswitchS1 isclosedattime=0mstotime=1200msontheaxesprovidedbelow. 3marks

1000

800

600

400

200

0

current(mA)

0 200 400 600 800 1000 1200

time (ms)

d. Nametwodevicesusedintheelectricalindustrythathaveinductance. 2marks

1.

2.

800 mH

450 µHL2

L1

Figure 13

e. WhatisthetotalinductanceforthecircuitshowninFigure13? 1mark


END OF QUESTION AND ANSWER BOOK

Question 11 (4marks)SoftwareapplicationsareusedinarangeofIntegratedTechnologyworkenvironments.

a. IdentifyonesoftwareapplicationusedinyourIntegratedTechnologyworkduringtheyearanddescribethetaskthatwascarriedout. 2marks

Softwareapplication

Description

b. ProvidetwoadvantagesofusingsoftwareapplicationsinanIntegratedTechnologyworkenvironment. 2marks

VET INTEG TECH (SAMPLE – ANSWERS)

© VCAA 2017 – April 2017

Answers to multiple-choice questions

Question Answer

1 A

2 B

3 C

4 D

5 C

6 B

7 C

8 D

9 A

10 C

11 A

12 B

13 A

14 B

15 C

16 D

17 C

18 B

19 D

20 A

VCE VET INTEGRATED TECHNOLOGIES - vcaa.vic.edu.au

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