WhichisaNOTline-of-sightprocess?(Repeat2010) not repeat

1.
WhichisaNOTline-of-sightprocess?(Repeat2010) not repeat! but which is a
line of sight process
(a)
Physicalvapordeposition
(b)
Flamespray
(c)
Chemicalvapordeposition
(d)
Hardfacing
(e)
Highvelocityoxyfuelspray

Answer is

Percent of accuracy%(10 -100)

Reference if possible

2.
Thereare“BasicRulesforThermalSpray”.Pickouttheoneexamplefromthosebelowthatisincorrect.
(a)
Adjustthe“Tv+p”conditionsfordifferentprocessesandmaterials.
(b)
Spraywithcorrectandadequatesurfacepreparation.
(c)
DonotuseTScoatingsasstructuralmembers.
(d)
Alwaysconsiderthefeedrateandspraydistance.
(e)
Edgesshouldnotbechamferedandcornersradiused.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

3.
.gif”>Wire-arcsprayrequiresfeedstocksthatare/have:(Repeat2010)
(a)
Electricallyconductive.
(b)
Ductile.
(c)
Highmeltingpoint.
(d)
Nonreactivewithoxygen
(e)
Combustible

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

4.
Referto.docx#_bookmark4″>Figure9whichshowsadiagram ofaHVOFtorch.Identifythepartthatis labelled“A”.
(a)
Oxygenline
(b)
Fuelline
(c)
Powderinjector
(d)
Combustor
(e)
Watercooling
.jpg” alt=”þÿ”>
Figure5

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

5.
Whatisthebestmediumtouseforstartinganontransferredarcplasmaspraytorch.
(a)
Agaseousmixtureofhydrogenandnitrogen
(b)
Highpurityargon
(c)
Highpurityhelium
(d)
Agasousmixtureofheliumandhydrogen
(e)
Highpurityoxygen

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

6.
Referto.docx#_bookmark5″>Figure9whichshowsadiagramofaplasmaspraytorch.Whatistheflametemperatureat20mmdownstreamfrom
thetorchand labelled “Y”?
(a)1000˚C(b)3000˚C(c)5000˚C(d)10000˚C(e)20000˚C

.gif” alt=”02a_f04″>

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

7.
Whichof the
followingparticlemorphologiesisconsideredidealasafeedstockpowderfromonlytheviewpointoffeeding?
(a)
Anangularshapedfeedstockpowder
(b)
Asphericalshapedfeedstockpowderthathasaverylargerangeofparticlesizedistributions
(c)
Ablendedpowderofangularmetalparticlesandsphericalceramicparticles
(d)
Aperfectlyspherical-shapedparticlewithaverynarrowparticlesizedistribution
(e)
Agglomeratedfeedstockpowder

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

8.
Thepowdercharacteristicsofacertaintypeofpartiallystabilisedzirconiahavebeensummarisedin.docx#_bookmark7″>Figure7.Whichofthefollowingwouldbethemostpreferredthermalsprayfeedstock?

.jpg” alt=”þÿ”>
Figure8

(a)
Fusedandcrushed
(b)
Sinteredandcrushed
(c)
Spraydried
(d)
Plasmafused
(e)
Solgel

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

9.
Theprimecharacteristicofagasatomizedpowderis:
(a)
.gif”>.gif”>Angularandirregularlyshapedparticles.
(b)
Generallysphericalshape,inavarietyofsizes.
(c)
Extremelyfinesizes(<1micron). (d) Exceptionallyhighdegreeofporosity. (e) Veryeconomicalpowderproductionmethod Answer is Percent of accuracy %(10 -100) Reference if possible 10. Thisquestionrelatestothepowdermanufacturingandtheresultingmorphology.Whichofthefollowingstatementsbestdescribesthemanufacturedmorphologyofthepowders? (a) Gasatomisedpowdersresultinadenseandsphericalmorphology. (b) Gasatomisedpowdershaveaporousandangularmorphology. (c) Wateratomisedpowdersresultinaporousandsphericalmorphology. (d) Agglomerateandsinteredpowdershavedenseandsphericalmorphology. (e) Sinteredandcrushedpowdersaresphericalandporous. Answer is Percent of accuracy %(10 -100) Reference if possible 11. .gif">.gif”>Theprimecharacteristicsofacrushedandmilledpowderare:
(a)
Smoothedgesandclosecontrolofparticlesizes.
(b)
Angularfeaturesandatendencytomanufacturesub-micronparticles(fines).
(c)
Angularfeaturesandverywideparticle-sizedistribution.
(d)
Asphericalmorphologyandabilitytoproduceahomogeneouschemicalcomposition.
(e)
Aagglomeratedfeedstockpowderthathasaverylargerangeofparticlesizedistributions

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

A B
.jpg” alt=”Powder_Feeders_01″>.jpg” alt=”Powder_Feeders_01″>

C D
.jpg” alt=”Powder_Feeders_02″>.jpg” alt=”Powder_Feeders_01″>

Figure9
12.
.docx#_bookmark8″>Figure7abovesummariesthevariousthermalsprayfeedingsystems.Identifywhichofthefollowingstatementsiscorrect.
(a)
Allofthethermalsprayfeedsystemsshowncanbeusedforthewire-arcsprayprocess.
(b)
Label‘A’isagravityandvibrationbasedsystem
(c)
Label‘B’describesasystemthatcanbeusedforwetpowders.
(d)
Label‘C’isafluidizedbedbasedsystem
(e)
Label‘D’describesrotatingwheelsystem.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

13. .gif”>Whichofthefollowingisnotanadvantageofthesol-gelmanufacturingtechnique?
(a)
Abilitytoproducesphericalpowderswhicharefree-flowing.
(b)
Closelycontrolledpowdercomposition,assol-gelisbasedonsolutionchemistry.
(c)
Itisahigh-temperatureprocess;verydensematerialscanbeproduced.
(d)
Thedegreeofpowderporositycanbecontrolled.
(e)
Verysmallprimaryparticlesizescanbeachieved(2-20nm)

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

14.
Therearefourmajortypesoffeedstockmorphologyforcarbide,thecharacteristicsofeachindividualmorphologycanbeseenin.docx#_bookmark9″>Figure8.Pleaseidentifypowderfeedstockmorphologydescribeandlabeled“C”?
(a)
Sintered
(b)
Coated
(c)
Agglomerated
(d)
Spheroidized
(e)
Cladded

.jpg” alt=”þÿ”>
Figure10

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

15.
Withrespecttosafethermalsprayoperations,whichofthefollowinglistsbestdescribetheessentialpersonalprotectiveequipment(PPE)forallthermalsprayoperators.
(a)
Earplugs,plasticglasses,plasticgloves,clothmask
(b)
Corkacousticbarrier,plasticglasses,plasticmask,leatherglove
(c)
Earplugs,plasticgloves,labcoat,steelcapboots
(d)
Earplugs,leathergloves,faceshieldwithweldingglasses,fineparticulaterespiratormask
(e)
Plasticglasses,fineparticulaterespiratormask,labcoat,leat

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

16. Whatisthebestwaytoimprovetheimpactresistanceandreducecoatingbrittlenessinthermallysprayedcomponents?
(a)
Postheattreat
(b) Sprayhot
(c) Usenopreheat
(d) Machinethecoating
(e) Quenchthecoatinginoilafterspraying

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

17. Heat-treatedsteelsubstratesshouldnotbepreheatedabove150°C(300°F)andkeptathightemperatureforlongtimesbecause:
(a)
Onlythincoatingscanbeapplied.
(b)
Coatingswillbeveryhard.
(c)
Preheatingmaychangepriorheat-treatedpropertiesofthesubstrate.
(d)
Coatingswillnotoxidize.
(e)
Thecoatingmayreactstronglywiththesubstrate

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

18.
Whatisthefirststepinsubstratesurfacepreparation?
(a)
Masking
(b)
Gritblastingforroughness
(c)
Preheating
(d)
Cleaningtoremovegreaseandoils
(e)
Macrorougheningbymachining

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

19.
Partandgunrelativemotionarecriticalformanyreasons.Whichofthefollowingismostlikelytooccurifmotionisnotproperlymanaged?
(a)
Coatingsareuneven.
(b)
Coatingswillturnblack.
(c)
Thegunwillnotoperate.
(d)
Thesubstratewilloxidize.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

20. .gif”>.gif”>Whatisthebestwaytoremovedust,debrisandlooseparticleswhilespraying?
(a)
Usealongstand-off(spraydistance).
(b)
Useahighpreheattemperature.
(c)
Usedirectedclean,drycompressedairstreamstoblowawayparticles.
(d)
Sprayslowlyandatlowsprayrate.
(e)
Increasethepowderfeedrate.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

21.
Whensectioningthermalsprayedtungstencarbidecoatingsitisimportanttominimizesurfacedamageintheformofhighplasticdeformation.Whattypeofcuttingtoolisusedforfineanddelicatespecimensectioning
(a)
Bandsaw
(b)
High-speedaluminumoxidegrindingwheel
(c)
Waterjetcutter
(d)
Alow-speeddiamondwheelcutter
(e)
Wireelectricaldischargemachining

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

22. Whichofthefollowingfiguresbestdescribesthecorrectorientationwhensectioningthermalsprayed
coated samples?
(a)
Figure1
(b)
Figure2
(c)
Figure3
(d)
Figure4
(e)
Noneoftheabove

Figure1

.jpg” alt=”þÿ”>

Figure2

.jpg” alt=”þÿ”>

Figure3

.jpg” alt=”þÿ”>

Figure4

.jpg” alt=”þÿ”>

Figure12

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

23. .gif”>Whatisthemainobjectiveofgrindingandpolishing?

(a)
Materialremoval
(b)
Inducescratchesonthematerial
(c)
Achievemirrorlikefinishonthesurface
(d)
Removematerialdefects
(e)
PreparethesampleforSEM
(f)
Removesoftphasesofacoating

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

24.
.gif”>Sectionedthermalsprayedsamplescanbeembeddedinresintofacilitatetheirhandlingandtoimprovethepreparationresult.Specimensthatneedperfectedgeretentionorprotectionoflayersrequiremounting.Choosethecorrect2typesofmountingbelow
(a)
Coldmounting&Liquidmounting
(b)
Warmmounting&Gasmounting
(c)
Liquidmounting&Hotmounting
(d)
Hotmounting&Coldmounting
(e)
Gasmounting&Coldmounting

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

25.
Thetwotypesofresidualstressesthatcanbegeneratedinproducingathermallysprayedcoating.(Repeat2010)
(a)
Shearstressandtensilestress
(b)
Tensilestressanduniaxialstress
(c)
Shearstressanduniaxialstress
(d)
Compressivestressandshearstress
(e)
Tensilestressandcompressivestress

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

26.
Howmanylayers arethere iftheindividualsplatthickness is5µmandthetotalcoatingthicknessis0.5mm?
(a)
1,000layers
(b)
100layers
(c)
10,000layers
(d)
250layers
(e)
2500layers

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

27. Thetensilestrengthofplasmaandthermallysprayedcoatingsis:
(a)
Higherthanconventionalwrought,cast,orforgedmaterials.
(b)
Approximatelyequaltoconventionalwrought,cast,orforgedmaterials.
(c)
Muchlessthanconventionalwrought,cast,orforgedmaterials.
(d)
Impossibletodetermine.
(e)
Noneoftheabove.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

28.
Thestrengthofplasmaandthermallysprayedmaterialsisduetothephenomenonof:(Repeat2010)
(a)
VanderWaalsforcesbetweenparticles.
(b)
Metallurgicalbonding.
(c)
Phasetransformations.
(d)
Mechanicalinterlockingofparticleswitharoughenedsurface.
(e)
Noneoftheabove.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

29. Referto.docx#_bookmark11″>Figure11.Iffailureoccursbetweenthebondcoatandsubstrate,identifythecorrectfailurelocusdescription.
(a)
Adhesiveceramic-bondcoatfailure.
(b)
Adhesivefailure.
(c)
Adhesivesubstrate-bondcoatfailure.
(d)
Cohesivebondcoatfailure.
(e)
Cohesivesubstrate-bondcoatfailure.

.jpg” alt=”þÿ”>
Figure13

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

30. Ceramic,thermalbarriercoatingsarebestsprayedbywhichmethod?(Repeat2010)
(a)
Plasmaspray
(b)
HVOF
(c)
Flame
(d)
Wire-arc
(e)
Coldspray

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

31. Refertothebelow(.docx#_bookmark12″>Figure 13)andselectthemostappropriateresponsefromthosesupplied(Repeat2010)

(a)
Thepartofthefigurereferredtoas“A”indicatesthe“target”.
(b)
Thepartofthefigurereferredtoas“A”indicatesthe“ionflux”.
(c)
Thepartofthefigurereferredtoas“A”indicatesthe“plasma”.
(d)
Thepartofthefigurereferredtoas“A”indicatesthe“substrate”.
(e)
Thepartofthefigurereferredtoas“A”indicatesthe“anode”.
.jpg” alt=”þÿ”>
Figure14

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

32. WhichofthefollowingstatementisincorrectwhenusingtheXPStechnique?
(a) Identificationofallelements(excepthydrogenandhelium)presentintheouter100Åofasample
(b)
Non-monochromatedx-raysourcescanpossiblydamagesampleduringanalysis
(c)
Quantitative2Dchemicalmapsusingimaging-XPS.
(d)
Knowthesurfaceconcentrationsofelementspresent
(e)
Detectionofpositiveandnegativeionsuptomassesof10,000Da

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

33.
.jpg” alt=”þÿ”>ForimagingSIMs,theprimaryionbeam,withalowernumberofionsperpulse,israsteredacrossthesurfaceandspectracollected,calculatethetimerequiredforacquisitionofaimageSIMusingtheinformationprovidedbelow.

(a)
20minutes
(b)
2000minutes
(c)
30minutes
(d)
300minutes
(e)
3000minutes

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

34. Thebestmaterialthathasbeenidentifiedforpreventingproteinadsorptioninpolymer“brush”coatingsis:
(a)
poly(ethyleneglycol)(PEG)
(b)
n-heptylamine(HAPP)
(c)
allylamine(AAPP)
(d)
polyacylamide
(e)
poly(ethyleneterephthalate)(PET)

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

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1.
.gif”>AchemicalreactorfabricatedinInconel625requiresalocalizedcoatingofInconel625.Thetypeofcorrosionwhichisbeingpreventedis:
(a) Heat-affectedzone.
(b) Crevice.
(c)
High-temperatureoxidation.
(d)
Pitting.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

2.
.gif”>.gif”>.gif”>Aplasmasprayedcoatingofaluminawasappliedtoprotectequipmentagainsthotexhaustgasesattemperaturesupto1250°C(2280ºF).ProperbondcoatsandsubstratematerialswithclosematchedCTEswereused,yetthecoatingfailed
afteronly3hoursinservice.Whatwasthemostlikelycause?
(a) Usedcombustionwiretoapplythebondcoat.
(b)
Contaminatedaluminaceramic.
(c)
Rapidcorrosionofthesubstratebysulfides.
(d) Gamma-to-alphaconversionofthealumina.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

3.
Thesourceofvariancenotattributabletothetensiletestmethodis:
(a)
Alignmentofpullbars.
(b)
Thicknessofadhesivelayer.
(c)
Loadingrate.
(d)
Splat-to-splatcohesion.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

4.
Thefigure44associatedwiththisquestionshowshowhardnessisrelatedtotherelativeabrasivewearresistance.Selectthemostappropriatealternativefromtheoptionsbelow.
(a)
Thewearresistanceofironwillalwaysbebetterthanthatofcopperunderallcircumstancesandconditions.
(b)
Thedataformolybdenumindicatesthat,undertheconditionsofthistestarrangement,itexhibitsgoodrelativeabrasionresistancecomparedtotheothermaterials.
(c)
There isa scientific relationship between hardness and relative abrasivewearresistance
thatisbasedonwell-definedphysicalprinciples.
(d)
Thereisalwaysalinearrelationshipbetweenhardnessandrelativeabrasivewearresistance.
(e)
Hardnessisidenticalthemodulusofamaterialbecausetheengineeringdimensionsarethesame.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

5.
.gif”>.gif”>Whichflatteneddroplet(showninthefigure35)bestdescribesimpactontoawellheatedpolishedsubstrate?

.jpg” alt=”þÿ”>
Fig.35

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

6.
.gif”>.gif”>Whichsecondarygaswouldbethemosteffectiveinensuringthatpowderismeltedinashorterdistance?
(a)
Nitrogen
(b) Helium
(c) Hydrogen
(d) Oxygen

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

7.
.gif”>Basedonyourknowledgeofparticlevelocitiesintheplasma,whatisthetypicaltraversetimeofaparticleinaplasma?
(a)
10milliseconds
(b)
1millisecond
(c)
100milliseconds
(d)
100nanoseconds

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

8.
Theparticlesizedistributionisanimportantmeasureinthermalspraytechnology.Awideparticlesizedistributionleadsto
(a)
Higherpowderflowability
(b)
Improveddepositionefficiency
(c)
Abroadparticletrajectory
(d)
Lessultrafines

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

9.
Whatmechanism canbeusedtoform
chemicalbondingbetweenathermal-sprayedmetalandaceramicsubstrate?
(a)
Theoxygen-metaleutectic.
(b)
Scrubbingthesubstratewithhotgassespriortodeposition.
(c)
Usingmetaloxidebondcoats.
(d)
SiCgritblastthesubstratebeforedeposition.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

10. Thefigure45belowrepresentsthefollowing.
(a) ThermalspraydepositionontothebottomofaJominybar.
(b) Oilquenchingofashaftcomponent.
(c) Atestthatwillallowhardnessprofilestobedetermined.
(d) Surfacepreparationoftheendofasteelbar.
(e) Extrusionofasteelbarthatneedstobecooled.
Fig45.jpg” alt=”þÿ”>

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

11.
Givenastableandconsistentthermaljetsource,whatisthenextmostimportantthermalsprayprocessparametertocontrol?
(a) Spraydistanceandmotion
(b) Powdercharacteristicsandfeed
(c) Surfacepreparationandtreatment
(d) Thesprayenvironment

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

12.
Acastironprintingcylinderwasrequiredtohaveafinishcoatingofausteniticstainlesssteelonitssurface.Thecastingsurfacewasfirstcleaned,thenmachinedformacroroughening,thermallysprayedwithmolybdenumandthenfinishthermallysprayedwithstainlesssteel.Themolybdenumthermalspraycoatingistermed:
(a) Abondcoating.
(b) Masking
(c) Preheating
(d) Feathering.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

13.
.gif”>Duringstart-upofaplasmasprayprocessitisobservedthatpowderflowfromthepowderfeedtubeisveryirregularandithasbeenascertainedthattheproblemliesinthepowderdeliverysystem.Whichofthefollowingstatementsiscorrect?
(a)
Thepowdermorphologyisangularandthusthehallflowvalueisnotacceptableforathermalspraypowder.
(b)
Thepowdermustbewetandisthusagglomeratingwithinthepowderfeeder.
(c)
.gif”>Itiscertainthatafluidized-bedfeederisbeingusedandthustheuseofarotatingwheelsystemwillalleviatethisproblem.
(d)
Theso-determinedpowderfeedingproblemisacomplextechnicaldifficultythatinvolvesmanyinterrelatedaspectsofthermalspraytechnology.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

14.
.gif”>.gif”>Refertothefigure26belowthatderivesfromapatenttitled“AMethodofProducingBodiesandCoatings ofGlass andOther Substances”.Indicatethebest choicefromthestatementsprovidedbelow.
(a)
Thefigurerepresentsaprimitiveplasmaspraytechnology.
(b)
Thefigureshowshowliquidscanbeatomizedinavacuum.
(c)
ThefigureisrelatedtomodernhighvelocityoxygenfuelandD-guntechnology.
(d)
Thefiguredepictsamethodofatomizingasolidrod;theparticlesofwhicharethenblownagainstasubstratetoestablishacoating.
(e)
Thefigureisaprimitivemethodforthecreationofthin,CVDcoatings.

Answer is

Percent of accuracy %(10 -100)

Reference if
possible

.jpg” alt=”þÿ”>Fig.26

15. .gif”>Whichgascombinationismostcommonlyusedinpowderflamespraying?
(a) Acetylene/oxygen
(b)
Hydrogen/oxygen
(c)
Propane/oxygen
(d)
Butane/oxygen

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

16. Combustionflame-spraycoatings,oncetheindustrymainstay,arenotascommerciallydominantaprocessnowbecause:
(a)
Ceramiccoatingscouldnotbesprayed.
(b)
Coatingporosityistoohigh.
(c)
Theprocessisnotastolerantofawiderangeofmaterialsasotherthermalsprayprocesses.
(d)
Theprocessisnoteconomicallycompetitive.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

17. .gif”>Whichcoatingprocesscannotapplyoxide-ceramics?
(a)
Chemicalvapordeposition
(b)
Physicalvapordeposition
(c)
.gif”>Thermalspray
(d)
Electroplating

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

18. .gif”>Whichisthehigh-temperaturephaseforlow-carbonsteel?
(a) Cementite
(b) Austenite
(c) Martensite
(d) Ferrite

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

19.
Refertothefigure6belowtoanswerthefollowingquestion.Thefigurerepresentstheiron-carbonphasediagram.Choosethemostappropriatealternativefromthelistbelow.
(a)
FieldAandFieldBareseparatedbythesolidusline.
(b)
.gif”>FieldCrepresentsthecementitephase.
(c) Pointbistheeutecticcomposition.
(d) Pointbistheperitecticcomposition.
(e) FieldDrepresentstheprecipitationofonlythegammaphase.
(f)
.jpg” alt=”þÿ”>Noneoftheaboveiscorrect.

Fig.6

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

20.
.gif”>.gif”>Usetheunlabeledschematicphasediagram(fig.9).Selectthemostappropriatestatementfromthoseprovidedbelow.
(a) The“A”regionrepresentsthe‘normalization’heattreatmentprocess.
(b) The“A”regionrepresentsthe‘fullanneal’heattreatmentprocess.
(c) The“B”regionrepresentsthe‘normalization’heattreatmentprocess.
(d) The“C”regionrepresentsthe‘fullannealheattreatmentprocess.
(e) .jpg” alt=”þÿ”>AlternativesBandCarecorrect.

Fig.9

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

21.
.gif”>The followingstatementsrefer toweldingprocesses. Whichoneofthesestatementsisconsideredasanadvantageofwelding?
(a) .gif”>Impossibletodissemblejointswithoutdestroyingdetailparts.
(b) Jointsofexceptionalstructuralintegrityandefficiencywillnotaccidentlyloosenordissemble.
(c) Unbalancedheatinputleadstodistortionorresidualstresses.
(d) Heatofweldingdegradesbaseproperties.
(e) Requiresconsiderableoperatorskill.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

22. .gif”>Indicatethemostaccuratestatementofthosepresentedbelowasitrelatestohardfacing.
(a)
Hardfacingmustbecarriedoutundervacuumconditions.
(b)
Thesurfacefinishofaweldingprocessthatiscarriedouttohardfaceanengineeringcomponentisalwaysverysmooth.
(c)
Allmaterials,includingceramics,polymersandcompositematerialscanbemanufacturedbymeansofahardfacingprocess.
(d)
Thehardfacingprocessisdefinedasanomni-directionalprocess.
(e)
Theadhesionofweldingandhardfacingprocessesisviaadiffusionalmechanism.
(f)
Aheataffectedzone(HAZ)isnotanartifactofahardfacingprocess.

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

23. .gif”>.gif”>.gif”>A processisrequiredtoimprovethewearresistanceandfatigueresistanceofsteel gears.Whatsurfacehardeningtreatmentwouldbemostappropriateforthisgear?
(a)
Carburizing
(b)
Carbo-nitriding
(c)
Flamehardening
(d)
Inductionhardening
(e)
Nitriding
(f)
Alloftheabove

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

24.
Thefigure1relatestophysical,intrinsicpropertiesofvariousmaterials.Parts(A)and(B)relatetotwodifferentproperties.Thehorizontalscalesareonlyindicatedforreferencepurposes.Choosethemostappropriatealternativefromthelistbelow.
(a)
Part(A)referstothetensilestrengthofthematerials.
(b)
Part(A)istheratioofthetensilestrengthtodensityofthematerials.
(c)
Part(B)referstothetensilestrengthofthematerials.
(d) Part(B)istheratioofthetensilestrengthtodensityofthematerials.
(e) Part(B)relatestotheabsoluteelectricalconductivityofthematerials.
(f)
Noneoftheaboveiscorrect.

.jpg” alt=”þÿ”>Fig:1

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

25.
Thefigure2belowrelatesanormalizedpropertytobehaviouratvarioustemperatures.Choosethemostappropriatealternativefromthelistbelow.
(a)
Theverticalaxisisexpressedintermsof‘yieldpointtoweight’.
(b) Therearenosuchmaterialsas‘CbandMobasedalloys’.
(c) Theverticalaxisistheabsolutetensilestrength.
(d)
Theverticalaxisisthetensilestrengththathasbeennormalizedwithrespecttodensity.
(e)
The‘Tialloys’aremisrepresentedasarefunctionalatmuchhighertemperatures.
(f)
.jpg” alt=”þÿ”>Theverticalaxisrepresentsathermalpropertysuchasexpansioncoefficient.

Fig.2

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

26.
Refertothefigure3belowandlookatthe‘???’identificationthatisindicatedfor‘TypeofMaterial3’.Choosethemostappropriatealternativefromthelistbelow.
(a)
ThismaterialismostprobablyacompositeorhybridmaterialbecausetheYoung’smodulusisverylarge.
(b)
MetalshavethegreatestYoung’smodulus;thus,thismaterialismostprobablyahighalloytoolsteel.
(c)
ThismaterialiseithertungstencarbideordiamondsincetheseareknowntogreatYoung’sModulusvalues.
(d) ThismaterialisacarbonfibrereinforcedmaterialthatissimilartoKevlar.
(e) Thismaterialiseitheraluminiumoxideoranotherformofglass.
(f)
.jpg” alt=”þÿ”>Itcanonlybedeterminedthatthismaterialsisanalloysinceonlysuchmaterialscanexhibitthebestextrinsicproperties.

.gif”>

Fig.3

Answer is

Percent of
accuracy %(10 -100)

Reference if possible

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