2003 Systems and Technology GA 3: Written examination

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1 2003 Assessment Rept 2003 Systems n Tehnology GA 3: Written exmintion GENERAL COMMENTS The 2003 exmintion ws se on ll res of stuy of Units 3 n 4 of the revise Systems n Tehnology Stuy Design. The following riteri were use to set the exmintion: 1. Knowlege of tehnologil onepts n priniples ssoite with integrte systems 2. Knowlege of tehnologil priniples ssoite with the ontrol of integrte systems 3. Unerstning of the funtion of n interreltionships etween system n its susystems 4. Unerstning of the reltionship etween tehnologil systems n the nturl environment 5. Unerstning of the role ignosis, evlution n repir 6. Unerstning of the role of esign in the proution of tehnologil system. Stuents were require to nswer ll questions on the pper. Following re omments out eh question n how mrks were ssigne. In the se of esriptive nswers, smples hve een supplie. SPECIFIC INFORMATION The following shoul e re in onjuntion with the Systems n Tehnology 2003 exmintion pper. In Question 1, stuents were require to emonstrte unerstning of their proution wk. A lrge rnge of ifferent nswers were given. The vie elow gives the etil require in nswering this question. Exmples from stuent exmintion ppers re inlue. Question 1 Nme the integrte system you proue. Pneumti n rushing system. Mrks 0 1 % Averge 0.35 Define the term integrte system. An integrte system is system me up of susystems from the mehnil n eletril/eletroni re (nswers s ove similr; mehnil inlues pneumti n hyruli). Mrks % Averge 1.51 Explin the purpose of your integrte system. The explntion of the purpose must e relte to the system nme ove. My system rushes ns. The n flls onto SPDT swith whih tivtes solenoi vlve tht llows pressurise ir through into pneumti yliner whih rushes the n. Mrks % Averge 1.34 Nme the two susystems tht me up your integrte system. The susystems nme shoul hve one susystem from the mehnil re n one susystem from the eletril/eletroni re. The SPDT swith n the two solenoi vlves. The oule ting pneumti yliner. Where stuents inlue oth susystems from the sme tegy only 1 mrk ws wre. Mrks % Averge 3.63 Drw systems lok igrm whih esries in terms of input, proess n output, the opertion of eh of the susystems you nme in 1. Susystem 1 Systems n Tehnology GA3 Exm VCAA 2003 Assessment Rept 1

2 Input A lerly relte esription of the input. Proess How the input is proesse. Output A ler relte esription of the output. A n 6V from ttery The n hits the SPDT swith, whih then hnges from NO to NC Susystem 2 Input A lerly relte esription of the input. Proess How the input is proesse. Output A ler relte esription of the output. The solenoi opens the vlves in the 3 prt solenoi vlve. The NC solenoi vlve tivtes n NO solenoi vlve etivtes. e f Mrks % Averge 2.16 e Nme evie tht ontrolle your integrte system. Single pole oule throw swith (SPDT). f Explin how this evie operte to ontrol your system. The explntion must e relte to the evie nme in Question 1e n esrie the ontrol of the system. In NO moe it llows urrent to the solenoi vlve whih llows ompresse ir into the yliner to keep it lose. An when the n hits, it swithes to NC moe n llows urrent to the solenoi vlve tht llows ir to flow to the rer of the yliner to shoot the rm out. g h Mrks % Compresse ir flows through the solenoi vlve n into the oule ting pneumti yliner, the rer en Averge 1.96 The rm in the pneumti yliner thrusts out of the hute n rushes the n. g Nme the esign moifition wk tht you rrie out. Stuents shoul nme sensile esign moifition tht reltes to the system nme in Question 1. Moifition of the n holer hmer. h Explin the intene purpose of the esign moifition wk. The explntion of the purpose shoul e of plusile nture n relte to tht nme in Question 1g. I moifie it so tht it woul ommote SPDT swith etween the holers. i Mrks Averge % Desrie n imptnt ft tht you took into onsiertion when rrying out your esign moifition wk. Exmples of this oul e: When esigning n engine stn the seletion of steel neee to e suffiiently strong enough to suppt the engine. When esigning n LED isply the tteries hosen h to hve suffiient pity to run the isply f 1 hour. I took into onsiertion tht I my hve neee to fit two swithes etween the holers so I me hole right up the mile of the hmer etween the holers. Question 2 Nme the integrte system on whih you were require to rry out ignosti test. The pneumti rushing system. 2 VCAA 2003 Assessment Rept Systems n Tehnology GA3 Exm

3 Mrks % Averge 2.08 Nme the speifi test tht you rrie out. The nswer shoul relte to test tht oul e rrie out on the system nme. I teste the kilo psls neee to rush the n. Explin in etil the purpose of the test. Stuents neee to provie etile esription of wht they hope to hieve from the nme test. My system ws unle to rush ns n I ouln t figure out why, so the first step tht I h to tke ws to fin out how muh pressure I neee to tully rush regulr n. i iii Mrks % Averge 2.11 i Nme the one piee of test equipment tht you use to tke mesurements on this system. A relevnt piee of test equipment tht oul e use to rry out tests on the nme system neee to e nme. Hyruli stress tester. ii Desrie the funtion of this piee of test equipment. The test equipment shoul e le to rry out the funtion esrie. This piee of equipment uses the power of hyrulis to rush something n shows on meter the fe in kp. iii Nme the speifi unit of mesurement re from the test equipment tht you nme in prt i. The item of test equipment nme in 2i must e ple of mesuring the unit of mesurement nme. Kilo psls. Mrks % Averge 1.15 Desrie n pproprite justment, repir mintenne proeure tht ws rrie out s result of your test. The proeure esrie here shoul e relevnt n plusile f the system nme. I h to moify the hyruli stress tester n rete new piee f it so it woul ommote n. I onlue tht my solenoi vlves were letting out some of the pressure. Beuse it tkes 120 kp 4 rs of pressure (from the test) to rush n. But I ws using 6 rs n it wsn t rushing. Question 3 Nme the tehnologil system tht you stuie. Oen swell powere reusle energy system. i iii Mrks % Averge 2.59 i Nme negtive environmentl effet ssoite with the opertion of the system. The negtive effet shoul e plusile n relte to the nme system. It tkes the power out of wves; sels n other se life n e in nger. ii Desrie how this negtive environmentl effet impts on the environment. The esription shoul etil negtive environmentl effet tht is relte the effet nme in Question 3i. You n t surf ner it. Sels n other se life n e suke into the genert intke. iii Suggest metho f reuing this negtive environmentl effet. The metho shoul e plusile n relte to the system nme. Systems n Tehnology GA3 Exm VCAA 2003 Assessment Rept 3

4 Don t surf ner it, put wire mesh over the low hole intke; use signge. Mrks % Averge 1.00 Nme n esrie positive effet of the tehnologil system on the environment. The negtive effet shoul e plusile n relte to the nme system n there must e esription. This system is non-polluting n retes lgoon ehin it n retes n rtifiil reef whih quti life n use. Question 4 Mrks % Averge 2.43 Desrie the opertion of the sluie gte in terms of its input, proess n output. Input Humn energy retes the mehnil movement of the ger hnle turning it in rotry iretion. Proess Ger A turns gers B n C n s result ger D moves in vertil iretion. Output The sluie gte opertes in vertil iretion to either llow stop the wter flow. Mrks % Averge 2.01 If ger A moves in lokwise iretion s illustrte in Figure 1, write the iretion of movement of eh of the other gers in the tle elow. You must use the ws lokwise ntilokwise n up own. Ger A Ger B Ger C Ger D Clokwise Clokwise Clokwise Up Mrks 0 1 % Averge 0.24 Wht ft is likely to reue the effiieny of the ger system? Frition. Mrks % Averge 1.03 Nme the two types of motion tht our in the ger system when the sluie gte is opening losing. Rotry motion; Liner motion e Mrks % Averge 0.58 Nme the type of fe ting on the onneting ro on the line provie elow eh igrm. iretion of fe iretion of fe sluie gte onneting ro sluie gte onneting ro Mu mu Figure 2. Lifting sluie gte Fe: Tension Figure 3. Closing sluie gte Fe: Compression 4 VCAA 2003 Assessment Rept Systems n Tehnology GA3 Exm

5 f Mrks % Averge 1.96 On the igrm elow (Figure 4) rw lever n pivot tht will gently lift the sluie gte from the rie mu. Mrk in the ret ples on your lever the lo (l) the efft (e) n the fulrum (f). sluie gte (e) (f) (l) mu pivot Figure 4 Question 5 Mrks % Averge 1.54 From the three logi gtes illustrte elow, nme the logi gte tht will llow the iruit to operte s esrie ove. Explin why you hose this logi gte. AND Gte The AND gte is the only gte whih gives 1 output when oth inputs re 1. Mrks 0 1 % Averge 0.80 The sluie gte piture elow (Figure 6), shows the position (x) of one wter level sens f the wter level iruit. On the igrm (Figure 6) mrk with the letter y the position of the seon sens. Note: The sluie gte only opens when there is mximum wter. The wter level must touh oth senss x n y. y sluie gte x Figure 6 Mrks Averge % Explin in etil how the utomti sluie gte system opertes s lose-loop system. You my use ws n/ igrms. Systems n Tehnology GA3 Exm VCAA 2003 Assessment Rept 5

6 One the power is pplie n the wter rehes the ret level the sluie gte egins to open. At this point the timer tkes over ontrol of the opertion n the sluie gte ontinues to open n wter flows into the irrigtion hnnel. After the preset time the timer rops out n the sluie gte loses llowing the yle to utomtilly egin gin. Question 6 Mrks % Nme eh omponent on the line provie. Averge 3.36 i ii Mrks % Averge 1.30 i The following symol hs the les, n e. Wht o the letters, n e stn f on this symol? _ se _ ollet e _ emitter ii Stte one funtion of this omponent. Swith mplifier. Mrks % Averge 0.86 Clulte the urrent rwn y the system if the sluie gte hs power onsumption of 1.2 kw from 24 volt supply. The fmul ws on pge 20 of the exmintion ooklet n ll wking neee to e shown. P I = V 1200 = 24 =50 Amperes Question 7 The tsk of lifting the sluie gte is now perfme y solenoi n ger rrngement (Figure 8 in exmintion). A solenoi is piston n yliner tht is operte y n eletromgnet. 6 VCAA 2003 Assessment Rept Systems n Tehnology GA3 Exm

7 Mrks % Averge 0.60 Desrie the two fts in the system whih t together to lose the sluie gte when the solenoi is e-energise. the opening of the solenoi y the spring on the solenoi piston the weight of the sluie gte. Mrks % Averge 1.61 Nme the omponent whih joins ger F to ger G. Chin Explin why ger F n G will lwys turn in the sme iretion The hin joins them together n will lwys rive them in the sme iretion. Mrks % Averge 1.32 Ger J will nee to move 200 mm to lift the sluie gte into the open position. Ger J hs pith of 5 egrees. How mny teeth will ger H require to move ger J 200 mm? (Fmul given on pge 20 n ll wking to e shown). istne move y riven ger Numer of teeth on river ger = river ger pith 200 = 5 = 40 Question 8 When setting up the new utomti sluie gte system, ignosti tests of mesurement re neee on the iniviul susystems efe the system is use. These ignosti heks n e either mehnil eletril/eletroni. Mrks % Averge 0.99 Nme mehnil test tht oul e perfme on one of the sluie gte susystems. There re t lest three possile nswers: Mesure the length of rope tthe to the sluie gte. Mesure the spring tension on the solenoi. Mesure the weight of the sluie gte. Desrie riefly the purpose of this test. There re t lest three possile nswers: Mesure if the rope is long enough to llow the sluie gte to lose n open properly. To etermine its strength n ility to fully open the piston on the solenoi. To etermine if the weight of the sluie gte mthes the weight on the rwing. Nme mesuring evie tht oul e use to perfm the test. There re t lest three possile nswers: Metri tpe mesure metri ruler. Press. Metri sles. f Mrks % Averge 1.50 Nme n eletril/eletroni test tht oul e perfme on one of the sluie gte susystems. Mesure the hrge in the 24 volt ttery. Systems n Tehnology GA3 Exm VCAA 2003 Assessment Rept 7

8 e Desrie riefly the purpose of this test To estlish if the tteries re fully hrge. f Nme mesuring evie tht oul e use to perfm the test. Multimeter voltmeter. Question 9 Mrks 0 1 % Averge 0.82 Wht effet will the rising wter hve on the sluie gte if there re no runners to guie/keep the sluie gte in ple? The rising wter will push the sluie gte sie. i ii Mrks % Averge 2.44 i Proue rwing elow whih shows the sluie gte suppte y two runners. Your rwing shoul show the sluie gte in the open position. ii On your rwing inlue n lel evie tht will keep the sluie gte in the open position to llow ontinuous irrigtion. Question 10 Mrks % Averge 3.43 On Figure 11 elow, esrie the input, proess n output of the utomti sluie gte system. Inlue in eh susystem ox the nme of n eletril, n eletroni n mehnil susystem tht mke up the system. Light, wter, DC voltge Eletroni iruits proess input infmtion to etermine sluie gte position Sluie gte opens wter flows. Solenoi susystem Light/rk wter etetion igitl iruit susystem Figure 11 Any of the ger susystems. susystem 8 VCAA 2003 Assessment Rept Systems n Tehnology GA3 Exm

9 Question 11 A frm hs numer of irrigtion hnnels tht hve een onverte to utomti opertion. Eletriity from rehrgele le i tteries will run the system. These will require replement s they wer out. A power soure f rehrging tteries hs to e selete. This n e ol power win generts s the re hs mny ys of high wins. Mrks % Averge 1.19 Stte one vntge of using win generts n ol power sttions. s Win generts: Clen energy free energy renewle. Col power sttions: Constnt power no nee to mintin power system. Mrks % Averge 1.39 Stte one isvntge of using win generts n ol power sttions. s Win generts: Lk of win unsightly the nee to mintin the system. Col power sttions: Pollution rete y urning ol long istnes to run power les. Mrks % Averge 1.13 Nme two vntges of using solr energy to hrge the tteries. s Clen energy renewle energy free energy. VCAA 2003 Pulishe y the Vitin Curriulum n Assessment Authity 41 St Anrews Ple, Est Melourne 3002 Photoopying: This pulition n only e photoopie f the use of stuents n tehers in Vitin Shools. Systems n Tehnology GA3 Exm VCAA 2003 Assessment Rept 9