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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.
VETINTEGTECH(SAMPLE) 4 April2017
SECTION A – continued
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.
April2017 5 VETINTEGTECH(SAMPLE)
SECTION A – continuedTURN OVER
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
VETINTEGTECH(SAMPLE) 6 April2017
SECTION A – continued
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
April2017 7 VETINTEGTECH(SAMPLE)
SECTION A – continuedTURN OVER
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
VETINTEGTECH(SAMPLE) 8 April2017
SECTION A – continued
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.
April2017 9 VETINTEGTECH(SAMPLE)
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.
VETINTEGTECH(SAMPLE) 10 April2017
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
April2017 11 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
Figure2showstheincompleteprintedcircuitboard(PCB)artworkfortheLEDdriverboard.
OnFigure2,drawalloftheconnectionsrequiredtoensurethePCBwilloperateaspertheschematicdiagramshowninFigure1.
C
E
B
P1
D1
R1 Q1
–
+
R2
Figure 2
VETINTEGTECH(SAMPLE) 12 April2017
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.
April2017 13 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
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 )
VETINTEGTECH(SAMPLE) 14 April2017
SECTION B – continued
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
April2017 15 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
Question 5 (6marks)RefertothecircuitdiagramshowninFigure6.
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
VETINTEGTECH(SAMPLE) 16 April2017
SECTION B – continued
Question 6 (4marks)RefertothecircuitdiagramshowninFigure7.
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
April2017 17 VETINTEGTECH(SAMPLE)
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
VETINTEGTECH(SAMPLE) 18 April2017
SECTION B – Question 7–continued
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
April2017 19 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
g. ThevoltageacrosstheLEDD5is1.5Vandthenominalcurrentthroughitis20mA.
i. WhatisthepurposeofresistorR1? 1mark
ii. WhatisthevalueofresistorR1?Showyourworking. 2marks
h. Ifa15Wloadisconnectedtotheoutput,whatcurrentratingshouldbeselectedforfuseF2? 2marks
i. Toexpandthecapabilityofthepowersupply,anotherregulator,providingavariable5–30VDC,istobeconnectedacrosspointsXandY.
Identifyoneissuethatwouldcreateaproblemifsuchamodificationwereimplemented. 1mark
VETINTEGTECH(SAMPLE) 20 April2017
SECTION B – Question 8–continued
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
April2017 21 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
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
VETINTEGTECH(SAMPLE) 22 April2017
SECTION B – Question 9–continued
Question 9 (6marks)Figure10showsamicrocontrollersystemthatmonitorsthelevelofwaterina5000Lwatertankandtransmitsthetank’swaterlevelstatusdatatoaremotecentralfacility.Apressuretransducerisusedtomeasurethetank’swaterlevel.
A
water tank
pressuretransducer
microcontroller
433 MHzASK transmitter
Figure 10
a. Thewatertank’sstatusdataistransmittedtotheremotecentralfacilityusinga433MHzASKtransmitter.
Whatdoestheacronym‘ASK’mean? 1mark
April2017 23 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
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
VETINTEGTECH(SAMPLE) 24 April2017
SECTION B – Question 10–continued
Question 10 (9marks)Figure12showsacircuitthatincludesaninductor.
10 VS1
R
10 Ω
– +L1
2 H
Figure 12
a. WhatisthetimeconstantforthecircuitshowninFigure12? 2marks
b. Nameonepropertyofaninductorthatdeterminesitsinductance. 1mark
April2017 25 VETINTEGTECH(SAMPLE)
SECTION B – continuedTURN OVER
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
VETINTEGTECH(SAMPLE) 26 April2017
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