Multiple choice exam question Essay Example

  • Category:
    Physics
  • Document type:
    Math Problem
  • Level:
    Masters
  • Page:
    4
  • Words:
    2894

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Physics

  1. Which is a NOT line-of-sight process? (Repeat2010) not repeat! but which is a line of sight process

    1. Physical vapor deposition

    2. Flame spray

    3. Chemical vapor deposition

    4. Hard facing

    5. velocity oxyfuel sprayHigh

Answer is

(c) Chemical vapor-deposition

Percent of accuracy%(10 -100)

Reference if possible

  1. There are “Basic Rules for Thermal Spray”. Pick out the one example from those below that is incorrect.

    1. Adjust the“ Tv+p” conditions for different processes and materials.

    2. Spray with correct and adequate surface preparation.

    3. Do not use TS coatings as structural members.

    4. Always consider the feed rate and spray distance.

    5. radiused.chamfered and corners Edges should not be

      Answer is

      (e) Edges should not be chamfered and corners radiused

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam questionWire-arc spray requires feed stocks that are/have:(Repeat2010)

    1. Electrically conductive.

    2. Ductile.

    3. Highmeltingpoint.

    4. Nonreactive with oxygen

    5. Combustible

      Answer is

      (a) Electrically conductive

      Percent of accuracy %(10 -100)

      Reference if possible

      Polymet 1

  3. Refer to 9Figure , which shows a diagram of a HVOF torch. Identify the part that is labeled “A”.

    1. Oxygenline

    2. Fuelline

    3. Powderinjector

    4. Combustor

    5. Watercooling

Multiple choice exam question 1

5Figure

Answer is

(d) combustor

Percent of accuracy %(10 -100)

Reference if possible

  1. What is the best medium to use for starting a non-transferred arc plasma spray torch.

    1. Agaseousmixtureofhydrogenandnitrogen

    2. Highpurityargon

    3. Highpurityhelium

    4. A gaseous mixture of helium and hydrogen

    5. oxygenpurityHigh

      Answer is

      (b) high purity argon

      Percent of accuracy %(10 -100)

      Reference if possible

  2. labeled “Y”?andfrom the torch downstream is the flame temperature at 20mm What torch. a plasma spray diagram of a which shows
    9Figure to Refer

(a)1000˚C

(b)3000˚C

(c)5000˚C

(d)10000˚C

(e)20000˚C

Multiple choice exam question 2

Answer is

(d(d) 10000˚C

Percent of accuracy %(10 -100)

Reference if possible

TST para. 2

  1. Which of the following particle morphologies is considered ideal as a feed stock powder from only the view point of feeding?

    1. Anangularshapedfeedstockpowder

    2. Asphericalshapedfeedstockpowderthathasaverylargerangeofparticlesizedistributions

    3. Ablendedpowderofangularmetalparticlesandsphericalceramicparticles

    4. Aperfectlyspherical-shapedparticlewithaverynarrowparticlesizedistribution

    5. Agglomeratedfeedstockpowder

      Answer is

      (b) A spherical shaped feed stock powder that has a very large range of particle size distribution

      Percent of accuracy %(10 -100)

      Reference if possible

  2. ThepowdercharacteristicsofacertaintypeofpartiallystabilisedzirconiahavebeensummarisedFigurein7.Whichofthefollowingwouldbethemostpreferredthermalsprayfeedstock?

Multiple choice exam question 3

Figure8

    1. Fused and crushed

    2. Sinteredandcrushed

    3. Spraydried

    4. Plasmafused

Answer is

(b) sintered and crushed

Percent of accuracy %(10 -100)

Reference if possible

  1. The prime characteristic of a gas atomized powder is:

    1. Multiple choice exam question 4Multiple choice exam question 5Angularandirregularlyshapedparticles.

    2. Generallysphericalshape,inavarietyofsizes.

    3. Extremelyfinesizes(<1micron).

    4. Exceptionallyhighdegreeofporosity.

    5. powderproductionmethodVeryeconomical

      Answer is

      (b) generally spherical shape in variety of sizes

      Percent of accuracy %(10 -100)

      Reference if possible

      Koseski et al. 1

  2. This question relates to the powder manufacturing and the resulting morphology. Which of the following statements best describes the manufactured morphology of the powders?

    1. Gas atomised powders result in a dense and spherical morphology.

    2. Gas atomised powders have a porous and angular morphology.

    3. Water atomized powders result in a porous and spherical morphology.

    4. Agglomerate and sintered powders have dense and spherical morphology.

    5. porous.are spherical and powders crushed and Sintered

      Answer is

      (a) Gas atomised powders result in a dense and spherical morphology

      Percent of accuracy %(10 -100)

      Reference if possible

      Koseski et al. 3

  3. Multiple choice exam question 6Multiple choice exam question 7The prime characteristics of a crushed and milled powder are:

    1. Smooth edges and close control of particle sizes.

    2. Angular features and a tendency to manufacture sub-micron particles (fines).

    3. Angular features and very wide particle-size distribution.

    4. A spherical morphology and ability to produce a homogeneous chemical composition.

    5. distributionssize large range of particle a very agglomerated feed stock powder that has A

Answer is

(b) Angular features and a tendency to manufacture sub-micron particles (fines)

Percent of accuracy %(10 -100)

Reference if possible

A B

Multiple choice exam question 8Multiple choice exam question 9

Multiple choice exam question 10Multiple choice exam question 11

Figure9

  1. 7Figure
    above summaries the various thermal spray feeding systems. Identify which of the following statements is correct.

    1. Allofthethermalsprayfeedsystemsshowncanbeusedforthewire-arcsprayprocess.

    2. Label‘A’isagravityandvibrationbasedsystem

    3. Label‘B’describesasystemthatcanbeusedforwetpowders.

    4. Label‘C’isafluidizedbedbasedsystem

    5. system.Label‘D’describesrotatingwheel

      Answer is

      (b) Label ‘A’ is a gravity and vibration based system

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 12technique?manufacturing sol-gel of the an advantage not of the following is Which

    1. Abilitytoproducesphericalpowderswhicharefree-flowing.

    2. Closelycontrolledpowdercomposition,assol-gelisbasedonsolutionchemistry.

    3. Itisahigh-temperatureprocess;verydensematerialscanbeproduced.

    4. Thedegreeofpowderporositycanbecontrolled.

    5. (2-20nm)beachievedcanparticlesizesVerysmallprimary

      Answer is

      It is a high-temperature process; very dense materials can be produced

      Percent of accuracy %(10 -100)

      Reference if possible

  3. There are four major types of feed stock morphology for carbide, the characteristics of each individual morphology can be seen in 8.Figure
    Please identify powder feed stock morphology describe and labeled “C”?

    1. Sintered

    2. Agglomerated

    3. Spheroidized

Multiple choice exam question 13

Figure10

Answer is

(c) Agglomerated

Percent of accuracy %(10 -100)

Reference if possible

  1. With respect to safe thermal spray operations, which of the following lists best describe the essential personal protective equipment (PPE) for all thermal spray operators.

    1. Earplugs,plasticglasses,plasticgloves,clothmask

    2. Corkacousticbarrier,plasticglasses,plasticmask,leatherglove

    3. Earplugs,plasticgloves,labcoat,steelcapboots

    4. Earplugs,leathergloves,faceshieldwithweldingglasses,fineparticulaterespiratormask

    5. Plasticglasses,fineparticulaterespiratormask,labcoat,leat

      Answer is

      (d) Earplugs, leather gloves, face shield with welding glasses, fine particulate respirator mask

      Percent of accuracy %(10 -100)

      Reference if possible

  2. What is the best way to improve the impact resistance and reduce coating brittleness in thermally sprayed components?

    1. Postheattreat

    2. Sprayhot

    3. Usenopreheat

    4. Machinethecoating

    5. oilaftersprayingincoatingtheQuench

      Answer is

      1. Post heat treat

      Percent of accuracy %(10 -100)

      Reference if possible

      OZ et al. 368

  3. Heat-treated steel substrates should not be preheated above 150°C (300°F) and kept at high temperature for long times because:

    1. Onlythincoatingscanbeapplied.

    2. Coatingswillbeveryhard.

    3. Preheatingmaychangepriorheat-treatedpropertiesofthesubstrate.

    4. Coatingswillnotoxidize.

    5. Thecoatingmayreactstronglywiththesubstrate

Answer is

(c) Preheating may change prior heat-treated properties of the substrate.

Percent of accuracy %(10 -100)

Reference if possible

  1. What is the first step in substrate surface preparation?

    1. Gritblastingforroughness

    2. Preheating

    3. Cleaningtoremovegreaseandoils

    4. Macrorougheningbymachining

Answer is

(d) Cleaning to remove grease and oil.

Percent of accuracy %(10 -100)

Reference if possible

  1. Part and gun relative motion are critical for many reasons. Which of the following is most likely to occur if motion is not properly managed?

    1. Coatingsareuneven.

    2. Coatingswillturnblack.

    3. Thegunwillnotoperate.

    4. substratewilloxidize.The

      Answer is

      1. Coatings are uneven

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 14Multiple choice exam question 15What is the best way to remove dust, debris and loose particles while spraying?

    1. Usealongstand-off(spraydistance).

    2. Useahighpreheattemperature.

    3. Usedirectedclean,drycompressedairstreamstoblowawayparticles.

    4. Sprayslowlyandatlowsprayrate.

    5. powderfeedrate.theIncrease

      Answer is

      1. Use directed clean, dry compressed air streams to blow away particles

      Percent of accuracy %(10 -100)

      Reference if possible

  3. When sectioning thermal sprayed tungsten carbide coatings it is important to minimize surface damage in the form of high plastic deformation. What type of cutting tool is used for fine and delicate specimen sectioning

    1. High-speedaluminumoxidegrindingwheel

    2. Waterjetcutter

    3. Alow-speeddiamondwheelcutter

    4. electricaldischargemachiningWire

      Answer is

      1. High-speed aluminum oxide grinding wheel

      Percent of accuracy %(10 -100)

      Reference if possible

  4. correct orientation when sectioning thermal sprayed coated samples?the the following figures best describes of Which

    1. Noneoftheabove

Multiple choice exam question 16

Multiple choice exam question 17

Multiple choice exam question 18

Multiple choice exam question 19

Figure12

Answer is

Percent of accuracy %(10 -100)

Reference if possible

  1. Multiple choice exam question 20What is the main objective of grinding and polishing?

    1. Materialremoval

    2. Inducescratchesonthematerial

    3. Achievemirrorlikefinishonthesurface

    4. Removematerialdefects

    5. PreparethesampleforSEM

    6. coatingaphasesofRemovesoft

      Answer is

      Achieve mirror like finish on the surface

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 21Sectioned thermal sprayed samples can be embedded in resin to facilitate their handling and to improve the preparation result. Specimens that need perfected geretention or protection of layers require mounting. Choose the correct 2 types of mounting below

    1. Coldmounting&Liquidmounting

    2. Warmmounting&Gasmounting

    3. Liquidmounting&Hotmounting

    4. Hotmounting&Coldmounting

    5. Coldmounting&mountingGas

      Answer is

      (b) Warm mounting & Gas mounting

      Percent of accuracy %(10 -100)

      Reference if possible

  3. The two types of residual stresses that can be generated in producing a thermally sprayed coating. (Repeat2010)

    1. Shearstressandtensilestress

    2. Tensilestressanduniaxialstress

    3. Shearstressanduniaxialstress

    4. Compressivestressandshearstress

    5. compressivestressandstressTensile

      Answer is

      1. Tensile stress and compressive stress

      Percent of accuracy %(10 -100)

      Reference if possible

      Tucker 13

  4. How many layers are there if the individual splat thickness is 5µm and the total coating thickness is 0.5mm?

    1. 1,000layers

    2. 100layers

    3. 10,000layers

    4. 250layers

    5. 2500layers

      Answer is

      1. 100 layers

      Percent of accuracy %(10 -100)

      Reference if possible

  5. The tensile strength of plasma and thermally sprayed coatings is:

    1. Higherthanconventionalwrought,cast,orforgedmaterials.

    2. Approximatelyequaltoconventionalwrought,cast,orforgedmaterials.

    3. Muchlessthanconventionalwrought,cast,orforgedmaterials.

    4. Impossibletodetermine.

    5. Noneoftheabove.

      Answer is

      1. Higher than conventional wrought, cast, or forged materials.

      Percent of accuracy %(10 -100)

      Reference if possible

  6. The strength of plasma and thermally sprayed materials is due to the phenomenon of: (Repeat2010)

    1. VanderWaalsforcesbetweenparticles.

    2. Metallurgical bonding.

    3. Phasetransformations.

    4. Mechanicalinterlockingofparticleswitharoughenedsurface.

    5. Noneoftheabove.

Answer is

  1. Metallurgical bonding

Percent of accuracy %(10 -100)

Reference if possible

  1. Refer Figure to 11.
    If failure occurs between the bond coat and substrate, identify the correct failure locus description.

    1. Adhesiveceramic-bondcoatfailure.

    2. Adhesivefailure.

    3. Adhesivesubstrate-bondcoatfailure.

    4. Cohesivebondcoatfailure.

    5. Cohesivesubstrate-bondcoatfailure.

Multiple choice exam question 22

Figure 13

Answer is

Adhesive substrate-bond coat failure

Percent of accuracy %(10 -100)

Reference if possible

  1. Ceramic, thermal barrier coatings are best sprayed by which method? (Repeat2010)

    1. Plasma spray

    2. Wire-arc

    3. sprayCold

      Answer is

      Percent of accuracy %(10 -100)

      Reference if possible

      (Tucker 10)

  2. Refer ) Figure 13to the below (and select the most appropriate response from those supplied (Repeat2010)

    1. The part of the figure referred to as “A” indicates the “target”.

    2. The part of the figurereferredtoas“A”indicatesthe“ionflux”.

    3. Thepartofthefigurereferredtoas“A”indicatesthe“plasma”.

    4. Thepartofthefigurereferredtoas“A”indicatesthe“substrate”.

    5. Thepartofthefigurereferredtoas“A”indicatesthe“anode”.

Multiple choice exam question 23

Figure14

Answer is

(c) The part of the figure referred to as “A” indicates the“ plasma

Percent of accuracy %(10 -100)

Reference if possible

  1. Which of the following statement is incorrect when using the XPS technique?

    1. Identificationofallelements(excepthydrogenandhelium)presentintheouter100Åofasample

    2. Non-monochromatedx-raysourcescanpossiblydamagesampleduringanalysis

    3. Quantitative2Dchemicalmapsusingimaging-XPS.

    4. Knowthesurfaceconcentrationsofelementspresent

    5. Daof10,000massestoupnegativeionsandDetectionofpositive

      Answer is

      (c) Quantitative 2D chemical maps using imaging- XPS

      Percent of accuracy %(10 -100)

      Reference if possible

  2. For imaging SIMs, the primary ion beam, with a lower number of ions per pulse, is rastered across the surface and spectra collected, calculate the time required for acquisition of an image SIM using the information provided below.

Multiple choice exam question 24

    1. 20minutes

    2. 2000minutes

    3. 30minutes

    4. 300minutes

    5. 3000minutes

      Answer is

      (c) 30 minutes

      Percent of accuracy %(10 -100)

      Reference if possible

  1. The best material that has been identified for preventing protein adsorption in polymer “brush” coatings is:

    1. poly(ethyleneglycol)(PEG)

    2. n-heptylamine(HAPP)

    3. allylamine(AAPP)

    4. polyacylamide

    5. (PET)poly(ethyleneterephthalate)

Answer is

(e) poly(ethyleneterephthalate)(PET)

Percent of accuracy %(10 -100)

Reference if possible

******************************************************************************************

  1. Multiple choice exam question 25A chemical reactor fabricated in Inconel625 requires a localized coating of Inconel625. The type of corrosion which is being prevented is:

    1. Heat-affectedzone.

    2. Crevice.

    3. High-temperatureoxidation.

    4. Pitting.

      Answer is

      (d) pitting

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 26Multiple choice exam question 27Multiple choice exam question 28A plasma sprayed coating of alumina was applied to protect equipment against hot exhaust gases at temperatures up to 1250°C (2280ºF). Proper bond coats and substrate materials with close matched CTEs were used, yet the coating failed after only 3 hours in service. What was the most likely cause?

    1. Usedcombustionwiretoapplythebondcoat.

    2. Contaminatedaluminaceramic.

    3. Rapidcorrosionofthesubstratebysulfides.

    4. ofthealumina.conversionGamma-to-alpha

      Answer is

      (d) Gamma-to-alpha conversion of the alumina

      Percent of accuracy %(10 -100)

      Reference if possible

  3. The source of variance not attributable to the tensile test method is:

    1. Alignment of pull bars.

    2. Thickness of adhesive layer.

    3. Loading rate.

    4. Splat-to-splat cohesion.

      Answer is

      (c) Loading rate

      Percent of accuracy %(10 -100)

      Reference if possible

  4. The figure 44 associated with this question shows how hardness is related to the relative abrasive wear resistance. Select the most appropriate alternative from the options below.

    1. Thewearresistanceofironwillalwaysbebetterthanthatofcopperunderallcircumstancesandconditions.

    2. Thedataformolybdenumindicatesthat,undertheconditionsofthistestarrangement,itexhibitsgoodrelativeabrasionresistancecomparedtotheothermaterials.

    3. There isa scientific relationship between hardness and relative abrasivewearresistance thatisbasedonwell-definedphysicalprinciples.

    4. Thereisalwaysalinearrelationshipbetweenhardnessandrelativeabrasivewearresistance.

    5. Hardnessisidenticalthemodulusofamaterialbecausetheengineeringdimensionsarethesame.

Answer is

(b)The data for molybdenum indicates that, under the conditions of this test arrangement, it exhibits good relative abrasion resistance compared to the other materials

Percent of accuracy %(10 -100)

Reference if possible

Multiple choice exam question 29

  1. Multiple choice exam question 30Multiple choice exam question 31Which flattened droplet (shown in the figure 35) best describes impact onto a well heated polished substrate?

Multiple choice exam question 32

Answer is

Percent of accuracy %(10 -100)

Reference if possible

Tucker 11

  1. Multiple choice exam question 33Multiple choice exam question 34Which secondary gas would be the most effective in ensuring that powder is melted in a shorter distance?

    1. Nitrogen

    2. Hydrogen

    3. Answer is

      (a) nitrogen

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 35Based on your knowledge of particle velocities in the plasma, what is the typical traverse time of a particle in a plasma?

    1. 10milliseconds

    2. 1millisecond

    3. 100milliseconds

    4. 100nanoseconds

      Answer is

      (c) 100 milliseconds

      Percent of accuracy %(10 -100)

      Reference if possible

  3. The particle size distribution is an important measure in thermal spray technology. A wide particle size distribution leads to

    1. Higher powder flow ability

    2. Improved deposition efficiency

    3. A broad particle trajectory

    4. Less ultra fines

      Answer is

      (b) Improved deposition efficiency

      Percent of accuracy %(10 -100)

      Reference if possible

  4. What mechanism can be used to form chemical bonding between a thermal-sprayed metal and a ceramic substrate?

    1. Theoxygen-metaleutectic.

    2. Scrubbingthesubstratewithhotgassespriortodeposition.

    3. Usingmetaloxidebondcoats.

    4. SiCgritblastthesubstratebeforedeposition.

      Answer is

      (c) Using metal oxide bond coats

      Percent of accuracy %(10 -100)

      Reference if possible

  5. The figure 45 below represents the following.

    1. ThermalspraydepositionontothebottomofaJominybar.

    2. Oilquenchingofashaftcomponent.

    3. Atestthatwillallowhardnessprofilestobedetermined.

    4. Surfacepreparationoftheendofasteelbar.

    5. Extrusionofasteelbarthatneedstobecooled.

Multiple choice exam question 36
45 Fig

Answer is

(d) Surface preparation of the end of a steel bar

Percent of accuracy %(10 -100)

Reference if possible

  1. Given a stable and consistent thermal jet source, what is the next most important thermal spray process parameter to control?

    1. Spraydistanceandmotion

    2. Powdercharacteristicsandfeed

    3. Surfacepreparationandtreatment

    4. Thesprayenvironment

      Answer is

      (b) Spray distance and motion

      Percent of accuracy %(10 -100)

      Reference if possible

  2. A cast iron printing cylinder was required to have a finish coating of austenitic stainless steel on its surface. The casting surface was first cleaned, then machined for macro roughening, thermally sprayed with molybdenum and then finish thermally sprayed with stainless steel. The molybdenum thermal spray coating is termed:

    1. Abondcoating.

    2. Preheating

    3. Feathering.

      Answer is

      (b) masking

      Percent of accuracy %(10 -100)

      Reference if possible

  3. Multiple choice exam question 37During start-up of a plasma spray process it is observed that powder flow from the powder feed tube is very irregular and it has been ascertained that the problem lies in the powder delivery system. Which of the following statements is correct?

    1. Thepowdermorphologyisangularandthusthehallflowvalueisnotacceptableforathermalspraypowder.

    2. Thepowdermustbewetandisthusagglomeratingwithinthepowderfeeder.

    3. Multiple choice exam question 38Itiscertainthatafluidized-bedfeederisbeingusedandthustheuseofarotatingwheelsystemwillalleviatethisproblem.

    4. technology.thermalsprayofaspectsinterrelatedmanyinvolvesdifficultythattechnicalacomplexisproblemfeedingpowderso-determinedThe

      Answer is

      (a) The powder morphology is angular and thus the hall flow value is not acceptable for a thermal spray powder

      Percent of accuracy %(10 -100)

      Reference if possible

  4. Multiple choice exam question 39Multiple choice exam question 40Refer to the figure 26 below that derives from a patent titled “A Method of Producing Bodies and Coatings of Glass and Other Substances”. Indicate the best choice from the statements provided below.

    1. Thefigurerepresentsaprimitiveplasmaspraytechnology.

    2. Thefigureshowshowliquidscanbeatomizedinavacuum.

    3. ThefigureisrelatedtomodernhighvelocityoxygenfuelandD-guntechnology.

    4. Thefiguredepictsamethodofatomizingasolidrod;theparticlesofwhicharethenblownagainstasubstratetoestablishacoating.

    5. Thefigureisaprimitivemethodforthecreationofthin,CVDcoatings.

Answer is

(d) The figure depicts a method of atomizing a solid rod; the particles of which are then blown against a substrate to establish a coating

Percent of accuracy %(10 -100)

Reference if possible

Multiple choice exam question 41
Fig.26

  1. Multiple choice exam question 42Which gas combination is most commonly used in powder flame spraying?

    1. Acetylene/oxygen

    2. Hydrogen/oxygen

    3. Propane/oxygen

    4. Butane/oxygen

      Answer is

      (a) Acetylene/oxygen

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Combustion flame-spray coatings, once the industry mainstay, are not as commercially dominant a process now because:

    1. Ceramiccoatingscouldnotbesprayed.

    2. Coatingporosityistoohigh.

    3. Theprocessisnotastolerantofawiderangeofmaterialsasotherthermalsprayprocesses.

    4. Theprocessisnoteconomicallycompetitive.

      Answer is

      Multiple choice exam question 43(c) The process is not as tolerant of a wide range of materials as other thermal spray processes

      Percent of accuracy %(10 -100)

      Reference if possible

  3. Multiple choice exam question 44Which coating process cannot apply oxide-ceramics?

    1. Chemical vapor deposition

    2. Physical vapor deposition

    3. Multiple choice exam question 45Thermal spray

    4. Electroplating

      Answer is

      (c) Thermal spray

      Percent of accuracy %(10 -100)

      Reference if possible

  4. Multiple choice exam question 46Which is the high-temperature phase for low-carbon steel?

    1. Cementite

    2. Austenite

    3. Martensite

    4. Answer is

      (d) Ferrite

      Percent of accuracy %(10 -100)

      Reference if possible

  5. Refer to the figure 6 below to answer the following question. The figure represents the iron-carbon phase diagram. Choose the most appropriate alternative from the list below.

    1. FieldAandFieldBareseparatedbythesolidusline.

    2. Multiple choice exam question 47FieldCrepresentsthecementitephase.

    3. Pointbistheeutecticcomposition.

    4. Pointbistheperitecticcomposition.

    5. FieldDrepresentstheprecipitationofonlythegammaphase.

    6. Multiple choice exam question 48None of the above is correct.

Answer is

(f) None of the above is correct

Percent of accuracy %(10 -100)

Reference if possible

  1. Multiple choice exam question 49Multiple choice exam question 50Use the unlabeled schematic phase diagram (fig.9). Select the most appropriate statement from those provided below.

    1. The“A”regionrepresentsthe‘normalization’heattreatmentprocess.

    2. The“A”regionrepresentsthe‘fullanneal’heattreatmentprocess.

    3. The“B”regionrepresentsthe‘normalization’heattreatmentprocess.

    4. The“C”regionrepresentsthe‘fullannealheattreatmentprocess.

    5. Multiple choice exam question 51AlternativesBandCarecorrect.

Answer is

(a) The “A” region represents the ‘normalization’ heat treatment process

Percent of accuracy %(10 -100)

Reference if possible

Pandey 15

  1. Multiple choice exam question 52The following statements refer to welding processes. Which one of these statements is considered as an advantage of welding?

    1. Multiple choice exam question 53Impossibletodissemblejointswithoutdestroyingdetailparts.

    2. Jointsofexceptionalstructuralintegrityandefficiencywillnotaccidentlyloosenordissemble.

    3. Unbalancedheatinputleadstodistortionorresidualstresses.

    4. Heatofweldingdegradesbaseproperties.

    5. Requiresconsiderableoperatorskill.

      Answer is

      (b) Joints of exceptional structural integrity and efficiency will not accidently loosen or dissemble

      Percent of accuracy %(10 -100)

      Reference if possible

  2. Multiple choice exam question 54Indicate the most accurate statement of those presented below as it relates to hard facing.

    1. Hardfacingmustbecarriedoutundervacuumconditions.

    2. Thesurfacefinishofaweldingprocessthatiscarriedouttohardfaceanengineeringcomponentisalwaysverysmooth.

    3. Allmaterials,includingceramics,polymersandcompositematerialscanbemanufacturedbymeansofahardfacingprocess.

    4. Thehardfacingprocessisdefinedasanomni-directionalprocess.

    5. Theadhesionofweldingandhardfacingprocessesisviaadiffusionalmechanism.

    6. A heat affected zone (HAZ) is not an artifact of a hard facing process.

      Answer is

      (f) A heat affected zone (HAZ) is not an artifact of a hard facing process

      Percent of accuracy %(10 -100)

      Reference if possible

  3. Multiple choice exam question 55Multiple choice exam question 56Multiple choice exam question 57A process is required to improve the wear resistance and fatigue resistance of steel gears. What surface hardening treatment would be most appropriate for this gear?

    1. Carburizing

    2. Carbo-nitriding

    3. Flamehardening

    4. Inductionhardening

    5. Nitriding

    6. Alloftheabove

      Answer is

      (a) carburizing

      Percent of accuracy %(10 -100)

      Reference if possible

      International Molybdenum Association para. 1

  4. The figure 1 relates to physical, intrinsic properties of various materials. Parts (A) and (B) relate to two different properties. The horizontal scales are only indicated for reference purposes. Choose the most appropriate alternative from the list below.

    1. Part(A)referstothetensilestrengthofthematerials.

    2. Part(A)istheratioofthetensilestrengthtodensityofthematerials.

    3. Part(B)referstothetensilestrengthofthematerials.

    4. Part(B)istheratioofthetensilestrengthtodensityofthematerials.

    5. Part(B)relatestotheabsoluteelectricalconductivityofthematerials.

    6. Noneoftheaboveiscorrect.

Multiple choice exam question 58Fig:1

Answer is

(a) Part (A) refers to the tensile strength of the materials

Percent of accuracy %(10 -100)

Reference if possible

  1. The figure 2 below relates a normalized property to behaviour at various temperatures. Choose the most appropriate alternative from the list below.

    1. Theverticalaxisisexpressedintermsof‘yieldpointtoweight’.

    2. Therearenosuchmaterialsas‘CbandMobasedalloys’.

    3. Theverticalaxisistheabsolutetensilestrength.

    4. Theverticalaxisisthetensilestrengththathasbeennormalizedwithrespecttodensity.

    5. The‘Tialloys’aremisrepresentedasarefunctionalatmuchhighertemperatures.

    6. Multiple choice exam question 59Theverticalaxisrepresentsathermalpropertysuchasexpansioncoefficient.

Answer is

(c) The vertical axis is the absolute tensile strength

Percent of accuracy %(10 -100)

Reference if possible

  1. Refer to the figure 3 below and look at the ‘???’ identification that is indicated for ‘Type of Material 3’. Choose the most appropriate alternative from the list below.

    1. ThismaterialismostprobablyacompositeorhybridmaterialbecausetheYoung’smodulusisverylarge.

    2. MetalshavethegreatestYoung’smodulus;thus,thismaterialismostprobablyahighalloytoolsteel.

    3. ThismaterialiseithertungstencarbideordiamondsincetheseareknowntogreatYoung’sModulusvalues.

    4. ThismaterialisacarbonfibrereinforcedmaterialthatissimilartoKevlar.

    5. Thismaterialiseitheraluminiumoxideoranotherformofglass.

    6. Multiple choice exam question 60Itcanonlybedeterminedthatthismaterialsisanalloysinceonlysuchmaterialscanexhibitthebestextrinsicproperties.

Multiple choice exam question 613Fig.

Answer is

(d) This material is a carbon fiber reinforced material that is similar to Kevlar

Percent of accuracy %(10 -100)

Reference if possible

Works Cited

2014. Web. June 9 2014 <http://www.imoa.info/molybdenum-uses/molybdenum-grade-alloy-steels-irons/case-hardening-steel.php>Case-hardening Steel.International Molybdenum Association.

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Microstructural Evolution of Injection Molded Gas and Water Atomized 316L Stainless Steel Powder During Sintering.Koseski, Ryan P., Suri, Pavan., Earhardt, Nicholas B., Randall M. & Kwon, Young-Sam.

52.3(2013): 368-370. METABK,Effect of Heat Treatment on the Wear and Corrosion Behaviors of a Gray Cast Iron Coated With a Colmonoy 88 Alloy Deposited by High Velocity Oxygen Fuel (HVOF) Thermal Spray.” OZ, A., Samur, R., Mindivan, H., Demir, A., Sagiroglu, S. & Yakut, A. “

n.d. Web. June 9 2014 <http:/ /paniit.iitd.ac.in/~pmpandey>Phase Diagrams and Heat Treatment of Metals.Pandey, Pulak M.

n.d. Web. June 9 2014 <http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CDUQFjAC&url=http%3A%2F%2Fwww.polymet.us%2Fwp-content%2Fuploads%2F2012%2F05%2FWire-Arc-Spray-vs-Wire-Flame-Spray.pdf&ei=5iCVU7-pGcbVPKzfgZgP&usg=AFQjCNEB8SHZABzVWN9RVfHmOMOE5MU7WA&sig2=pDIoLiSJ1et5oLTa-vX3Tg&bvm=bv.68445247,d.ZWU>Wire Arc Spray vs. Wire Flame Spray.Polymet.

2014. Web. June 9 2014 <http://www.tstcoatings.com/plasma_spray.html>Plasma Spray.TST.

ASM International. 2013. Print. Introduction to Coating Design and Processing.Tucker, RC.

2014. Web. June 9 2014. <http://www.twi-global.com/technical-knowledge/faqs/process-faqs/faq-what-is-sol-gel-processing/>What is Sol-gel Processing? Frequently Asked Questions.TWI.