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HomeEngineeringMaterialsObjectivetypeQuestionsandAnswers195TOPEngineeringMaterialsMechanicalEngineeringMultipleChoiceQuestionsandAnswers

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195TOPEngineeringMaterialsMechanicalEngineeringMultipleChoiceQuestionsandAnswersLatestEngineeringMaterialsQuestionsandAnswersList

1.Ductilityofamaterialcanbedefinedas(a)abilitytoundergolargepermanentdeformationsincompression(b)abilitytorecoveritsoriginalform(c)abilitytoundergolargepermanentdeformationsintension(d)alloftheabove(e)noneoftheabove.Ans:c

2.Malleabilityofamaterialcanbedefinedas(a)abilitytoundergolargepermanentdeformationsincompression(b)abilitytorecoveritsoriginalform(c)abilitytoundergolargepermanentdeformationsintension(d)alloftheabove(e)noneoftheabove.Ans:a

3.Incompression,aprismofbrittlematerialwillbreak(a)byformingabulge(l>)byshearingalongobliqueplane(c)indirectionperpendiculartoapplicationofload(d)bycrushingintothousandsofpieces(e)noneoftheabove.Ans:b

4.Theabilityofamaterialtoresistsofteningathightemperatureisknownas(a)creep(b)hottempering(c)hothardness(d)fatigue(e)superhardening.Ans:c

5.Mildsteelbelongstothefollowingcategory(a)lowcarbonsteel(b)mediumcarbonsteel(c)highcarbonsteel(d)alloysteel(e)specialsteel.Ans:a

6.Theultimatetensilestrengthoflowcarbonsteelbyworkingatahighstrainratewill(a)decrease(b)increase(c)remainconstant(d)firstincreaseandthendecrease(e)firstdecreaseandthenincrease.Ans:b

7.Slowplasticdefomiationofmetalsunderaconstantstressisknownas(a)creep(b)fatigue(c)endurance(d)plasticdeformation(e)nonplasticdeformation.Ans:a

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8.Theultimatetensilestrengthandyieldstrengthofmostofthemetals,whentemperaturefallsfrom0tol00Cwill(a)increase(b)decrease(c)remainsame(d)firstincreaseandthendecrease(e)showunpredictablebehaviour.Ans:a

9.Thenumberofelectronsin1cm3ofmetalwouldbeoftheorderof(a)1010(b)TO16(c)1022(d)1040(e)1052Ans:c

10.Stressrelaxationisthephenomenon(a)inwhichpartsarenotloaded(b)inwhichstressremainsconstantonincreasingload(c)inwhichdeformationtendstoloosenthejointandproducesastressreduced(d)stressreducesonincreasingload(e)noneoftheabove.Ans:c

ll.Theelasticstressstrainbehaviourofrubberis(a)linear(b)nonlinear(c)plastic(d)nofixedrelationship(e)unpredictablebehaviour.Ans:b

12.Isotropicmaterialsarethosewhichhavethesame(a)elasticpropertiesinalldirections(b)stressesinducedinalldirections(c)thermalpropertiesinalldirections(d)electricandmagneticpropertiesinalldirections(e)densitythroughout.Ans:a

13.Recrystallizationtemperatureisone(a)atwhichcrystalsfirststartformingfrommoltenmetalwhenitiscooled(b)atwhichnewsphericalcrystalsfirstbegintoformfromtheolddeformedonewhenastrainedmetalisheated(c)atwhichchangeofallotropicformtakesplace(d)atwhichcrystalsgrowbiggerinsize(e)atwhichcrystalsaredestroyedonheating.Ans:b

14.Pointsofarrestforironcorrespondto(a)stagesatwhichallotropicformschange(b)stagesatwhichfurtherheatingdoesnotincreasetemperatureforsometime(c)stagesatwhichpropertiesdonotchangewithincreaseintemperature(d)thereisnothinglikepointsofarrest(e)noneoftheabove.Ans:a

15.Deltaironoccursattemperatureof(a)roomtemperature(b)abovemeltingpoint(c)between1400Cand1539C(c)between910Cand1400C(e)noneoftheabove.Ans:c

16.Amaterialisknownasallotropicorpolymorphicifit(a)hasafixedstructureunderallconditions(b)existsinseveralcrystalformsatdifferenttemperatures(c)respondstoheattreatment(d)hasitsatomsdistributedinarandompattern(e)noneoftheabove.Ans:b

17.Superconductionbymetalsisobservedinthetemperaturerangeof(a)below10K(b)above100K(c)around0C(d)around100C(e)above1000C.Ans:a

18.Whichofthefollowingconstituentsofsteelsissoftestandleaststrong(a)austenite(b)pearlite(c)ferrite(d)cementlte(e)bainite.Ans:c

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19.Whichofthefollowingrepresentstheallotropicformsofiron(a)alphairon,betaironandgammairon(b)alphaironandbetairon(c)bodycentredcubicaironandfacecentredcubicairon(d)alphairon,gammafromanddeltairon(e)noneoftheabove.Ans:d

20.Thefollowingtypesofmaterialsareusuallythemostductile(a)facecentredcubiclattice(b)bodycentredcubiclattice(c)hexagonalclosepackedlattice(d)alloftheabove(e)noneoftheabove.Ans:a

21.Pureironisthestructureof(a)ferrite(b)pearlite(c)anstenite(d)ferriteandcementite(e)ferriteandpearlite.Ans:a

22.Thetemperatureatwhichferromagneticalphairontransformstoparamagneticalphaironis(a)770C(b)910C(c)1050C(d)belowrecrystallisationtemperature(e)aboverecrystallizationtemperature.Ans:a

23.Gammaironexitsatfollowingtemperature(a)roomtemperature(b)nearmeltingpoint(c)between1400Cand1539C(d)between910Cand1400C(e)noneoftheabove.Ans:d

24.Ferromagneticalphaironexistsintemperaturerangeof(a)below723C(b)770910C(c)9101440C(d)14001539C(e)above1539C.Ans:a

25.Paramagneticalphaironchangestogammaironat(a)770C(b)910C(c)1440C(d)1539C(e)noneoftheabove.Ans:b

26.Areversiblechangeintheatomicstructureofsteelwithcorrespondingchangeinthepropertiesisknownas(a)molecularchange(b)physicalchange(c)allotropicchange(d)soliduschange(e)atomicchange.Ans:c

27.Themoleculesinasolidmove(a)inarandommanner(b)inahaphazardway(c)incircularmotion(d)backandforthliketinypendulums(e)donotmove.Ans:d

28.Thecrystalstructureofgammaironis(a)bodycentredcubic(b)facecentredcubic(c)hexagonalclosepacked(d)cubicstructure(e)orthorhombiccrystal.Ans:b

29.Thecrystalofalphaironis(a)bodycentredcubic(b)facecentredcubic(c)hexagonalclosepacked(d)cubicstructure(e)orthorhombiccrystal.

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Ans:a

30.Themetallicstructureofmildsteelis(a)bodycentredcubic(b)facecentredcubic(c)hexagonalclosepacked(d)cubicstructure(e)orthorhombiccrystal.Ans:a

31.Fortheallotropicformsofiron,thepointsofarrestare(a)thepointswherenofurtherchangeoccurs(b)constantforallmetals(c)thepointswherethereisnofurtherflowofmetal(d)thepointsofdiscontinuity(e)thepointswheremajorchangestakeplace.Ans:d

32.Thepercentageofcarboninpigironvariesfrom(a)0.1to1.2%(b)1.5to2.5%(c)2.5to4%(d)4to4.5%(e)4.5to6.3%.Ans:d

33.Thepercentageofcarboningreyironcastingsusuallyvariesbetween(a)0.5to1%(b)12%(c)2.5to4.5%(d)57%(e)79%.Ans:c

34.Pigironisthenamegivento(a)rawmaterialforblastfurnace(b)productofblastfurnacemadebyreductionofironore(c)ironcontaininghugequantitiesofcarbon(d)ironinmoltenformintheladles(e)ironscrap.Ans:b

35.Theuniquepropertyofcastironisitshigh(a)malleability(b)ductility(c)surfacefinish(d)dampingcharacteristics(e)hardness.Ans:d

36.Castironischaracterisedbyminimumoffollowing%ageofcarbon(a)0.2%(b)0.8%(c)1.3%(d)2%(e)6.3%.Ans:d

37.Ingreycastiron,carbonispresentintheformof(a)cementite(b)freecarbon(c)flakes(d)spheroids(e)nodularaggregatesofgraphite.Ans:c

38.Innodulariron,graphiteisintheformof(a)cementite(b)freecarbon(C)flakes(d)spheroids(e)nodularaggregatesofgraphite.Ans:d

39.Inmalleableiron,carbonispresentintheformof(a)cementite(b)freecarbon(c)flakes(d)spheroids(e)nodularaggregatesofgraphite.Ans:e

40.Wroughtironis(a)hard(b)highinstrength(c)highlyresistanttocorrosion(d)heattreatedtochangeitsproperties

(e)leastresistanttocorrosion.Ans:c

41.Sulphurinpigirontendstomakeit(a)hard'(b)soft(c)ductile(d)tough(e)malleable.Ans:a

42.Pickupwrongstatementaboutwroughtiron(a)Itcontainscarbonoftheorderof0to0.25%(b)Itmeltsat1535C(c)Itisverysoftandductile(d)Itcanbeeasilyforgewelded(e)Itismadebyaddingsuitablepercentageofcarbontomoltenironandsubjectingtheproducttorepeatedhammeringandrolling.Ans:e

43.Ironis(a)paramagnetic(b)ferromagnetic(c)ferroelectric(d)dielectric(e)noneoftheabove.Ans:b

44.Areversiblechangeintheatomicstructureofthesteelwithacorrespondingchangeinthepropertiesisknownas(a)allotropicchange(b)recrystallisation(c)heattreatment(d)precipitation(e)austempering.Ans:a

45.Chilledcastironhas(a)nographite(b)averyhighpercentageofgraphite(c)alowpercentageofgraphite(d)graphiteasitsbasicconstituentofcomposition(e)noneoftheaboveistrue.Ans:a

46.Castironhas(a)hightensilestrength(b)itselasticlimitclosetotheultimatebreakingstrength(c)highductility(d)alloftheabove(e)noneoftheabove.Ans:b

47.Whitecastironcontainscarbonintheformof(a)freecarbon(b)graphite(c)cementite(d)whitecarbon(e)ferrite.Ans:c

48.Inmottledcastiron,carbonisavailablein(a)freeform(b)combinedform(c)nodularform(d)flatform(e)partlyinfreeandpartlyincombinedstate.Ans:e

49.Animportantpropertyofhighsilicon(1218%)castironisthehigh(a)tenacity(b)brittleness(c)plasticity(d)corrosionresistance(e)hardness.Ans:e

50.Animportantpropertyofmalleablecastironincomparisontogreycastironisthehigh(a)compressivestrength(b)ductility(c)carboncontent(d)hardness(e)surfacefinish.Ans:b

51.Steelcontains(a)80%ormoreiron(b)50%ormoreiron

(c)alloyingelementslikechromium,tungstennickelandcopper(d)elementslikephosphorus,sulphurandsiliconinvaryingquantities(e)highquantitiesofsulphur.Ans:b

52.Carbonsteelis(a)madebyaddingcarboninsteel(b)refinedfromcastiron(c)analloyofironandcarbonwithvaryingquantitiesofphosphorusandsulphur(d)extensivelyusedformakingcuttingtools(e)extremelybrittle.Ans:c

53.Annealingofwhitecastironresultsinproductionof(a)malleableiron(b)nodulariron(c)spheroidaliron(d)greyiron(e)noneoftheabove.Ans:a

54.'Killedsteels'arethosesteels(a)whicharedestroyedbyburning(b)whichaftertheirdestructionarerecycledtoproducefreshsteel(c)whicharedeoxidisedintheladlewithsiliconandaluminium(d)inwhichcarboniscompletelyburnt(e)whichhavepoorpropertiesduetoimpropermanufacturing.Ans:c

55.Hardnessofsteeldependson(a)amountofcarbonitcontains(b)theshapeanddistributionofthecarbidesiniron(c)methodoffabrication(d)contentsofalloyingelements(e)thequalityoforefromwhichitismade.Ans:b

56.Maximumpercentageofcarboninferriteis(a)0.025%(b)0.06%(c)0.1%(d)0.25%(e)0.8%.Ans:a

57.Maximumpercentageofcarboninausteniteis(a)0.025%(b)0.26%(c)0.8%(d)1.25%(e)1.7%.Ans:e

58.Corrosionresistanceofsteelisincreasedbyadditionof(a)chromiumandnickel(b)sulphur,phosphorus,lead(c)vanadium,aluminium(d)tungsten,molybdenum,vanadium,chromium(e)zinc.Ans:a

59.Inwhichofthefollowingcases,considerationofcreepisimportant(a)flywheelofsteamengine(b)castironpipes"(c)cyclechains(d)gasturbineblades(e)pistonI.C.engine.Ans:d

60.Themosteffectiveinhibitorofgraingrowth,whenaddedinsmallquantitiesis(a)carbon(b)vanadium(c)manganese(d)cobalt(e)copper.Ans:b

61.Depthofhardnessofsteelisincreasedbyadditionof(a)nickel(b)chromium(c)tungsten(d)vanadium(e)elloftheabove.Ans:b

62.Railwayrailsarenormallymadeof(a)mildsteel

(b)alloysteel(c)highcarbon(d)tungstensteel(e)castironsteel.Ans:c

63.Pickupthewrongstatement(a)aluminiuminsteelresultsinexcessivegraingrowth(b)manganeseinsteelinduceshardness(c)nickelandchromiuminsteelhelpinraisingtheelasticlimitandimprovetheresilienceandductility(d)tungsteninsteelsimprovesmagneticpropertiesandhardenability(e)sulphur,phosphorousandleadimprovemachiningpropertiesofsteel.Ans:a

64.PickupthewrongstatementNickelandchromiuminsteelhelpin(a)providingcorrosionresistance(b)improvingmachiningproperties(c)providinghighstrengthatelevatedtemperatures(d)raisingtheelasticlimit(e)improvingtheresilienceandductility.Ans:b

65.Machiningpropertiesofsteelareimprovedbyadding(a)sulphur,lead,phosphorous(b)silicon,aluminium,titanium(c)vanadium,aluminium(d)chromium,nickel(e)lubricants.Ans:a

66.Eutectoidsteelcontainsfollowingpercentageofcarbon(a)0.02%(b)0.3%(c)0.63%(d)0.8%(e)1.2%.Ans:d

67.ThebasicconstituentsofHastelloyare(a)aluminium,copperetc.(b)nickel,molybdenumetc.(c)nickel,copper,etc.(d)alloftheabove(e)noneoftheabove.Ans:b

68.BasicconstituentsofMonelmetalare(a)nickel,copper(b)nickel,molybdenum(c)zinc,tin,lead(d)nickel,leadandtin(e)noneoftheabove.Ans:a

69.Germansilverisanalloyof(a)silverandsomeimpurities(b)refinedsilver(c)nickel,copperandzinc(d)nickelandcopper(e)silverandgold.Ans:c

70.Surveyingtapesaremadeofamaterialhavinglowcoefficientofexpansionandenoughstrength.Thealloyusedis(a)silvermetal(b)duralumin(c)Hastelloy(d)monelmetal(e)invar.Ans:e

71.Acoldchiselismadeof(a)mildsteel(b)castiron(c)H.S.S.(d)highcarbon(e)germansilver.Ans:d

72.Anengineer'shammerismadeof(a)castiron(b)forgedsteel(c)mildsteel(d)highcarbonsteel(e)H.S.S.Ans:d

73.Inconelisanalloyof

(a)nickel,chromiumandiron(b)nickel,copper(c)nickel,chromium(d)nickel,zinc(e)nickel,lead.Ans:a

74.Byseverelydeformingametalinaparticulardirectionitbecomes(a)ductile(b)malleable(c)homogeneous(d)isotropic(e)anisotropic.Ans:e

75.Solderisanalloyconsistingof(a)tin,antimony,copper(b)tinandcopper(c)tinandlead(d)leadandzinc(e)leadandcopper.Ans:b

76.Cyanidingistheprocessof(a)dippingsteelincyanidebath(b)reactingsteelsurfacewithcyanidesalts(c)addingcarbonandnitrogenbyheattreatmentofsteeltoincreaseitssurfacehardness(d)obtainingcyanidesalts(e)makingcorrosionresistantsteel.Ans:c

77.Inductionhardeningistheprocessof(a)hardeningsurfaceofworkpiecetoobtainhardandwearresistantsurface(b)heatingandcoolingrapidly(c)increasinghardnessthroughout(d)inducinghardnessbycontinuousprocess(e)hardeningcore.Ans:a

78.Thelossofstrengthincompressionwithsimultaneousgaininstrengthintensionduetooverloadingisknownas(a)hysteresis(b)creep(c)viscoelasticity(d)Boeschingereffect(e)inelasticity.Ans:d

79.Processofaustemperingresultsin(a)formationofbainitestructure(b)carburisedstructure(c)martenisticstructure(d)lamellarlayersofcarbidedistributedthroughoutthestructure(e)relievingofstressesthroughoutacomponent.Ans:a

80.Thesurfacehardnessofthefollowingorderisachievedbynitridingoperation(a)600VPN(b)1500VPN(c)1000to1100VPN(d)250VPN(e)2000VPN.Ans:c

81.Hardnessofmartensiteisabout(a)RC65(b)RC48(c)RC57(d)RC80(e)RC32.Ans:a

82.Welddecayisthephenomenonfoundwith(a)castiron(b)mildsteel(c)nonferrousmaterials(d)wroughtiron(e)stainlesssteel.Ans:e

83.Materialsaftercoldworkingaresubjectedtofollowingprocesstorelievestresses(a)hotworking(b)tempering(c)normalising(d)annealing(e)specialheattreatment.Ans:d

84.Hardnessofupperbainite(acicularstructure)isabout(a)RC65(b)RC48(c)RC57(d)RC80(e)RC32.Ans:b

85.Carboninironisanexampleof(a)substitutionalsolution(b)interstitialsolidsolution(c)intermetalliccompounds(d)alloftheabove(e)noneoftheabove.Ans:b

86.Brass(alloyofcopperandzinc)isanexampleof(a)substitutionalsolidsolution(b)interstitialsolidsolution(c)intermetalliccompounds(d)alloftheabove(e)noneoftheabove.Ans:a

87.Whichisfalsestatementaboutannealing.Annealingisdoneto(a)relievestresses(b)hardensteelslightly(c)improvemachiningcharacteristic(d)softenmaterial(e)permitfurthercoldworking.Ans:b

88.Argentiteistheprincipaloreorrawmaterialfor(a)aluminium(b)tin(c)zinc(e)lead(e)silver.Ans:e

89.Hardnessoflowerbainite(temperedmartensite)isabout(a)RC65(b)RC48(c)RC57(d)RC80(e)RC32.Ans:c

90.Whichisfalsestatementaboutnormalizing.Normalizingisdoneto(a)refinegrainstructure(b)reducesegregationincasting(c)improvemechanicalproperties(d)inducestresses(e)relieveinternalstresses.Ans:d

91.Vanadiuminhighspeedsteels(a)promotesdecarburisation(b)provideshighhothardness(c)formsveryhardcarbidesandthusincreaseswearresistance(d)promotesretentionofaustenite(e)increasestoughness.Ans:c

92.Amorphousmaterialisone(a)inwhichatomsalignthemselvesinageometricpatternuponsolidification(b)inwhichthereisnodefiniteatomicstructureandatomsexistinarandompatternjustasinaliquid(c)whichisnotattackedbyphosphorous(d)whichemitsfumesonmelting(e)noneoftheabove.Ans:b

93.Dislocationsinmaterialsrefertothefollowingtypeofdefect(a)pointdefect(b)linedefect(c)planedefect(d)volumetricdefect(e)chemicaldefect.Ans:b

94.Anexampleofamorphousmaterialis(a)zinc(b)lead(c)silver(d)glass(e)brass.

Ans:d

95.Whichisfalsestatementabouttempering.Temperingisdoneto(a)improvemachinability(b)improveductility(c)improvetoughness(d)releasestresses(e)reducehardnessandbrittleness.Ans:a

96.Whichisfalsestatementaboutcasehardening.Casehardeningisdoneby(a)electroplating(b)cyaniding(c)inductionhardening(d)nitriding(e)flamehardening.Ans:a

97.Whichofthefollowingisthebindingmaterialincementedcarbides(a)cobalt(b)nickel(c)vanadium(d)iron(e)carbon.Ans:a

98.Chromiuminsteel(a)improveswearresistance,cuttingabilityandtoughness(b)refinesgrainsizeandproduceslesstendencytocarburisation,improvescorrosionandheatresistantproperties(c)improvescuttingabilityandreduceshardenability(d)givesductility,toughness,tensilestrengthandanticorrosionproperties(e)makessteelhard.Ans:a

99.Manganeseinsteelincreasesits(a)tensilestrength(b)hardness(c)ductility(d)fluidity(e)malleability.Ans:a

100.Cementedcarbidetoolsarenotfoundtobesuitableforcutting(a)brass(b)castiron(c)aluminium(d)steel(e)nonferrousalloys.Ans:d

101.Sulphurinsteel(a)actsasdeoxidiser(b)reducesthegrainsize(c)decreasestensilestrengthandhardness(d)lowersthetoughnessandtransverseductility(e)increaseshardness.Ans:d

102.Tungsteninsteel(a)improveswearresistance,cuttingabilityandtoughness(b)refinesgrainsizeandproduceslesstendencytocarburisation,improvescorrosionandheatresistantproperties(c)improvescuttingabilityandreduceshardenability(d)givesductility,toughness,tensilestrengthandanticorrosionproperties(e)raisesitsmeltingpoint.Ans:b

103.Tungsteninhighspeedsteelprovides(a)hothardness(b)toughness(c)wearresistance(d)sharpcuttingedge(e)coldhardness.Ans:a

104.Whichofthefollowingisnotthecorrectmethodofincreasingfatiguelimit(a)shotpeening(b)nitridingofsurface(c)coldworking(d)surfacedecarburisation(e)understressing.Ans:d

105.Connectingrodisusuallymadeof(a)aluminium(b)lowcarbonsteel(c)mediumcarbonsteel

(d)highcarbonsteel(e)castiron.Ans:c

106.Whichofthefollowingpipesisleastcorrosionresistant(a)brass(b)mildsteel(c)castiron(d)wroughtiron(e)copper.Ans:d

107.Tensilestrengthofsteelcanbesafelyincreasedby(a)addingcarbonupto2.8%(b)addingcarbonupto6.3%(c)addingcarbonupto0.83%(d)addingsmallquantitiesofcopper(e)addingcopperandcarbon.Ans:c

108.Highcarbonsteelcarriescarbon%agec(a)0.1to0.3%(b)0.3to0.6%(c)0.6to0.8%(d)0.8to1.5%(e)1.5to2.5%.Ans:d

109.Cobaltinsteel(a)improveswearresistance,cuttinabilityandtoughness(b)refinesgrainsizeandproduceslestendencytocarburisation,improvecorrosionandheatresistantproperties(c)improvescuttingabilityandreducehardenability(d)givesductility,toughness,tensilestrengthandanticorrosionproperty:(e)noneoftheabove.Ans:c

110.Thepercentageofcarboninlowcarbonsteelis(a)0.05%(b)0.15%(c)0.3%(d)0.5%(e)0.7%.Ans:b

111.Thehardnessofsteelincreasesifitcontains(a)austenite(b)martensite(c)pearlite(d)cementite(e)alloftheabove.Ans:b

112.Greycastiron(a)contains1.7to3.5%carboninfreestateandisobtainedbytheslowcoolingofmoltencastiron(b)isalsoknownaschilledcastironamisobtainedbycoolingrapidly.Iti:almostunmachinable(c)isproducedbyannealingprocess.Iissoft,toughandeasilymachinecmetal(d)isproducedbysmalladditionsomagnesium(orcerium)intheladleGraphiteisinnodularorspheroidaformandiswelldispersedthroughoutthematerial(e)noneoftheaboveistrue.Ans:a

113.Nodularironhas(a)highmaehinability(b)lowmeltingpoint(c)hightensilestrength(d)goodfluidity(e)alloftheabove.Ans:e

114.Nickelinsteel(a)improveswearresistance,cuttingabilityandtoughness(b)refinesgrainsizeandproduceslesstendencytocarburisation,improvescorrosionandheatresistantproperties(c)improvescuttingabilityandreduceshardenability(d)givesductility,toughness,tensilestrengthandanticorrosionproperties(e)noneoftheabove.Ans:d

115.Whichofthefollowingelementsdoesnotimparthardnesstosteel(a)copper(b)chromium(c)nickel(d)silicon(e)noneoftheabove.Ans:a

116.Thepresenceofsulphurinpigironmakes(a)iteasilymachinable

(b)itbrittle(c)ithard(d)thecastingunsound(e)increasesthefluidity.Ans:d

117.Meltingpointofironis(a)1539C(b)1601C(c)1489C(d)1712C(e)1131C.Ans:a

118.Compressivestrengthofgreycastironintonnes/cmisoftheorderof(a)35(b)57(c)710(d)1015(e)1522.Ans:b

119.Blastfurnaceproducesfollowingbyreductionofironore(a)castiron(b)pigiron(c)wroughtiron(d)malleableiron(e)whiteiron.Ans:b

120.Cupolaproducesfollowingmateriala)castiron(b)pigiron(C)wroughtiron(d)malleableiron(e)whiteiron.Ans:a

121.Themachinabilityofsteelisincreasedby(a)siliconandsulphur(b)phosphorous,leadandsulphur(c)sulphur,graphiteandaluminium(d)phosphorousandaluminium(e)noneoftheabove.Ans:b

122.Thefollowingelementcan'timparthighstrengthatelevatedtemperature(a)manganese(b)magnesium(c)nickel(d)silicon(e)noneoftheabove.Ans:b

123.WhichofthefollowingelementresultsinpresenceoffreegraphiteinC.I.(a)carbon(b)sulphur(c)silicon(d)manganese(e)phosphorous.Ans:c

124.Whitecastiron(a)contains1.7to3.5%carboninfreestateandisobtainedbytheslowcoolingofmoltencastiron(b)isalsoknownaschilledcastironandisobtainedbycoolingrapidly.Itisalmostunmachinable(c)isproducedbyannealingprocess.Itissoft,toughandeasilymachinedmetal(d)isproducedbysmalladditionsofmagnesium(orcreium)intheladle.Graphiteisinnodularorspheroidalformandiswelldispersedthroughoutthematerial(e)noneoftheabove.Ans:b

125.Coldrolledsteelsheetscontaincarbonofthefollowingorder(a)0.1%(b)0.2%(c)0.4%(d)0.6%(e)0.8%.Ans:a

126.Pipesforbicycleframesaremadeof(a)coldrolledsteel(b)hotrolledsteel(c)forgedsteel(d)caststeel(e)carbonchromesteel.Ans:a

127.Largeforgings,crankshafts,axlesnormallycontaincarbonupto(a)0.05to0.20%(b)0.20to0.45%(c)0.45to0.55%(d)0.55to1.0%(e)1.0to1.2%.Ans:c

128.Heavydutyleafandcoilspring*containcarbonofthefollowingorder(a)0.2%(b)0.5%(c)0.8%(d)1.0%(e)1.5%.Ans:d

129.Taps,diesanddrillscontaincarbon(a)below0.5%(b)below1%(c)above1%(d)above2.2%(e)nil.Ans:c

130.Dropforgingdiescontaincarbonoftheorderof(a)0.1to0.2%(b)0.25to0.5%(c)0.6to0.7%(d)0.7to0.9%(e)1.0to1.2%.Ans:c

131.Whichisthefalsestatementaboutwroughtiron.Ithas(a)highresistancetorustingandcorrosion(b)highductility(c)abilityofholdprotectivecoating(d)easilyweldablecharacteristics(e)uniformstrengthinalldirections.Ans:e

132.Thetensilestrengthofwroughtironismaximum(a)alongthelinesofslagdistribution(b)perpendiculartolinesofslagdistribution(c)uniforminalldirections(d)unpredictable(e)noneoftheabove.Ans:a

133.Ballsforballbearingsaremadeof(a)castiron(b)mildsteel(c)stainlesssteel(d)carbonchromesteel(e)highcarbonsteel.Ans:d

134.Malleablecastiron(a)containsl.7to3.5%carboninfreestateandisobtainedbytheslowcoolingofmoltencastiron(b)isalsoknownaschilledcastironandisobtainedbycoolingrapidly.Itisalmostunmachinable(c)isproducedbyannealingprocess.Itissoft,tough,andeasilymachinedmetal(d)isproducedbysmalladditionsofmagnesium(orcerium)intheladle.Graphiteisinthenodularorspheroidalformandiswelldispersedthroughoutthematerial(e)noneoftheabove.Ans:c

135.Preheatingisessentialinwelding(a)castiron(b)highspeedsteel(c)allnonferrousmaterials(d)alloftheabove(e)noneoftheabove.Ans:a

136.Thehardnessofsteelprimarilydependson(a)%ageofcarbon(b)%ageofalloyingelements(c)heattreatmentemployed(d)methodofmanufacture(e)shapeofcarbidesandtheirdistributioniniron.Ans:e

137.Steelmadefromphosphaticironis(a)brittle(b)hard(c)ductile(d)tough(e)malleable.

Ans:a

138.Ductilecastiron(a)contains1.7to3.5%carboninfreestateandisobtainedbytheslowcoolingofmoltencastiron(b)isalsoknownaschilledcastironandisobtainedbycoolingrapidly.Itisalmostunmachinable(c)isproducedbyannealingprocess.Itissoft,toughandeasilymachinedmetal(d)isproducedbysmalladditionsofmagnesium(orcreium)intheladle.Graphiteisinnodularorspheroidalformandiswelldispersedthroughoutthematerial(e)noneoftheabove.Ans:d

139.Brasscontains(a)70%copperand30%zinc(b)90%copperand10%tin(c)8592%copperandresttinwithlittleleadandnickel(d)7075%copperandresttin(e)70%copperand30%tin.Ans:a

140.Thecrystalstructureofbrassis(a)F.C.C.(b)B.C.C.(c)H.C.P.(d)Orthorhombiccrystallinestructure(e)noneoftheabove.Ans:a

141.Thecompositionofsilversolderis(a)silver,copper,zinc(b)silver,tin,nickel(c)silver,lead,zinc(d)silver,copper,aluminium(e)silver,lead,tin.Ans:a

142.Whichoneofthefollowingmetalswouldworkhardenmorequicklythantheothers?(a)copper(b)brass(c)lead(d)silver(e)aluminium.Ans:b

143.Aspecimenofaluminiummetalwhenobservedundermicroscopeshows(a)B.C.C.crystallinestructure(b)F.C.C.crystalstructure(c)H.C.P.structure(d)acomplexcubicstructure(e)orthorhombiccrystallinestructure.Ans:b

144.Theusualcompositionofasolderingalloyis(a)tin,leadandsmallpercentageofantimony(b)tinandlead(c)tin,leadandsilver(d)tinandcopper(e)tin,copperandlead.Ans:a

145.Admiraltybrassusedforsteamcondensertubescontainscopperandzincinthefollowingratio(a)50:50(b)30:70(c)70:30(d)40:60(e)60:40.Ans:b

146.Corrosionresistanceofsteelisincreasedbyadding(a)chromiumandnickel(b)nickelandmolybdenum(c)aluminiumandzinc(d)tungstenandsulfur(e)noneoftheabove.Ans:a

147.Corrundumcontainsmorethan95%(a)steel(b)A1203(c)Si02(d)MgO(e)germansilver.Ans:b

148.Alnico,analloyusedextensivelyforpermanentmagnetscontainsiron,nickel,aluminiumandcobaltinthefollowingratio(a)50:20:20:10(b)40:30:20:10

(c)50:20:10:20(d)30:20:30:20(e)50:10:20:20.Ans:a

149.Ifarefractorycontainshighcontentofsilicon,itmeansrefractoryis(a)acidic(b)basic(c)neutral(d)brittle(e)noneoftheabove.Ans:c

150.Bellmetalcontains(a)70%copperand30%zinc(b)90%copperand10%tin(c)8592%copperandresttinwithlittleleadandnickel(d)7075%copperandresttin(e)7075%copperandrestzincandtin.Ans:d

151.Whichofthefollowingisusedforbearingliner(a)gunmetal(b)bronze(c)bellmetal(d)babbitmetal(e)brass.Ans:d

152.Thecorrectsequencefordescendingorderofmachinabilityis(a)greycastiron,lowcarbonsteel,wroughtiron(b)lowcarbonsteel,greycastiron,wroughtiron(c)wroughtiron,lowcarbonsteel,greycastiron(d)wroughtiron,greycastiron,lowcarbonsteel(e)greycastiron,wroughtiron,lowcarbonsteel.Ans:a

153.Structuralsteelcontainsfollowingprincipalalloyingelements(a)nickel,chromiumandmanganese(b)tungsten,molybdenumandphosphorous(c)lead,tin,aluminium(d)zinc,sulphur,andchromium(e)noneoftheabove.Ans:a

154.Aluminiumbronzecontainsaluminiumandcopperintheratioof(a)50:50(b)40:60(c)60:40(d)10:90(e)90:10.Ans:d

155.Bronzecontains(a)70%copperand30%zinc(b)90%copperand10%tin(c)8592%copperandresttinwithlittleleadandnickel(d)7075%copperandresttin(e)90%copperand10%zinc.Ans:b

156.Muntzmetalcontainscopperandzincintheratioof(a)50:50(b)40:60(c)60:40(d)20:80(e)80:20.Ans:c

157.Gunmetalcontains(a)70%copperand30%zinc(b)90%copperand10%tin(c)8592%copperandresttinwithlittleleadandnickel(d)7078%copperandresttin(e)8592%copperandrestzinc.Ans:c

158.Perminvaralloyhavingconstantpermeabilityisanalloyof(a)nickel,copperandiron(b)nickel,copperandzinc(c)copper,nickelandantimony(d)iron,zincandbismuth(e)antimony,copperandzinc.Ans:a

159.Thealloyusedformakingelectricalresistancesandheatingelementsis(a)nichrome

(b)invar(c)magnin(d)elinvar(e)peiminvar.Ans:a

160.Monelmetalcontains(a)63to67%nickeland30%copper(b)88%copperand10%tinandrestzinc(c)alloyoftin,leadandcadmium(d)malleableironandzinc(e)noneoftheabove.Ans:a

163.Permalloyisa(a)kindofstainlesssteel(b)noneferrousalloy(c)polymer(d)cuttingtoolmaterial(e)nickelandironalloyhavinghighpermeability.Ans:e

164.Phosphorbronzecontains(a)0.5%ofphosphorous(b)1%phosphorous(c)2.5%phosphorous(d)5%phosphorous(e)noneoftheabove.Ans:e

165.Freecuttingsteels(a)areusedwhereeaseinmachiningisthecriterion(b)containcarboninfreeform(c)requireleastcuttingforce(d)donotexist(e)canbecutfreelyevenunderadverseconditions.Ans:a

166.Deltametalisanalloyof(a)copper,zincandiron(b)iron,nickelandcopper(c)iron,leadandtin(d)iron,aluminiumandmagnesium(e)copper,zincandantimony.Ans:a

167.Admiraltygunmetalcontains(a)63to67%nickeland30%copper(b)88%copper,10%tinandrestzinc(c)alloyoftin,leadandcadmium(d)ironscrapandzinc(e)noneoftheabove.Ans:b

168.Whichofthefollowingalloysdoesnotcontaintin(a)whitemetal(b)solderadmiralty(c)fusiblemetal(d)phosphorbronze(e)gunmetal.Ans:a

169.Whichisfalsestatementaboutpropertiesofaluminium(a)modulusofelasticityisfairlylow(b)wearresistanceisverygood(c)fatiguestrengthisnothigh(d)creepstrengthlimitsitsusetofairlylowtemperatures(e)corrosionresistanceisgood.Ans:b

170.Additionofcoppertoaluminiumresultsin(a)improvementofcastingcharacteristics(b)improvementofcorrosionresistance(c)oneofthebestknownageandprecipitationhardeningsystems(d)improvingmachinability(e)noneoftheabove.Ans:c

171.Additionofmanganesetoaluminiumresultsin(a)improvementofcastingcharacteristics(b)improvementofcorrosionresistance(c)oneofthebestknownageandprecipitationhardeningsystems(d)improvingmachinability(e)noneoftheabove.Ans:b

172.Elinvar,analloyusedinprecisioninstruments,hairspringsforwatches,etc.containsthefollowingelementas

principalalloyingelement(a)iron(b)copper(c)aluminium(d)zinc(e)nickel.Ans:e

173.Whichofthefollowingalloysdoesnothavecopperasoneoftheconstituents(a)deltametal(b)monelmetal(c)constantan(d)nichrome(e)siliconbronze.Ans:d

174.Additionofleadandbismuthtoaluminiumresultsin(a)improvementofcastingcharacteristics(b)improvementofcorrosionresistance(c)oneofthebestknownageandprecipitationhardeningsystems(d)improvingmachinability(e)noneoftheabove.Ans:d

175.Additionofsilicontoaluminiumresultsin(a)improvementofcastingcharacteristics(b)improvementofcorrosionresistance(c)oneofthebestknownageandprecipitationhardeningsystems(d)improvingmachinability(e)noneoftheabove.Ans:a

176.Constantantanalloyusedinthermocouplesisanalloyof(a)copperandtin(b)copperandzinc(c)copperandiron(d)copperandnickel(e)copperandchromium.Ans:d

177.Whitemetalcontains(a)63to67%nickeland30%copper(b)88%copperand10%tinandrestzinc(c)alloyoftin,leadandcadmium(d)silverandchromium(e)malleablecastironandsilver.Ans:c

178.Germansilvercontains(a)1%silver(b)2.5%silver(c)5%silver(d)10%silver(e)100%silver.Ans:c

179.Whichofthefollowinghashighestspecificstrengthofallstructuralmaterials(a)magnesiumalloys(b)titaniumalloys(c)chromiumalloys(d)magneticsteelalloys(e)noneoftheabove.Ans:b

180.Dowmetalcontains(a)94%aluminium,4%copperand0.5%Mn,Mg,SiandFe(b)92.5%aluminiumand,4%copper,2%nickeland1.5%Mg(c)90%aluminiumand90%copper(d)90%magnesiumand9%aluminiumwithsomecopper(e)90%magnesiumand10%tin.Ans:d

181.Foundrycrucibleismadeof(a)mildsteel(b)germansilver(c)lead(d)castiron(e)graphite.Ans:e

182.Agehardeningisrelatedwith(a)stainlesssteel(b)gunmetal(c)germansilver(d)duralumin(e)castiron.Ans:d

183.Aluminiumbronzecontains(a)94%aluminium,4%copperand0.5%Mn,Mg,SiandFe(b)92.5%aluminium,4%copper,2%nickel,and1.5%Mg(c)10%aluminiumand90%copper(d)90%magnesiumand9%aluminiumwithsomecopper(e)10%aluminiumand90%tin.Ans:c

184.Babbitmetalisa(a)leadbasealloy(b)tinbasealloy(c)copperbasealloy(d)alloftheabove(e)(a)and(c)above.Ans:e

185.ThecorrectcompositionofBabbitmetalis(a)87.75%Sn,4%Cu,8%Sb,0.25%Bi(b)90%Sn,2%Cu,4%Sb,2%Bi,2%Mg(c)87%Sn,4%Cu,8%Sb,1%Al(d)82%Sn,4%Cu,8%Sb,3%Al,3%Mg(e)noneoftheabove.Ans:a

186.DuraJomincontains(a)94%aluminium,4%copperand0.5%Mn,Mg,SiandFe(b)92.5%aluminium,40%copper,2%nickel,and1.5%Mg(c)10%aluminiumand90%copper(d)90%magnesiumand9%aluminiumwithsomecopper(e)94%aluminiumand6%tin.Ans:a

187.NeutralsolutionisonewhichhaspHvalue(a)greaterthan7(b)lessthan7(c)equalto7(d)pHvaluehasnothingtodowithneutralsolution(e)noneoftheabove.Ans:c

188.AcidicsolutionisonewhichhaspHvalue(a)greaterthan7(b)lessthan7(c)equalto7(d)pHvaluehasnothingtodowithneutralsolution(e)noneoftheabove.Ans:b

189.BasicsolutionisonewhichhaspHvalue(a)greaterthan7(b)equalto7(c)lessthan7(d)pHvaluehasnothingtodowithbasicsolution(e)noneoftheabove.Ans:a

190.Followingelementshavefacecentredcubicstructure(a)gammairon(910to1400C),Cu,Ag,Au,Al,Ni,Pb,Pt(b)Mg,Zn,Ti,Zr,Br,Cd(c)airon(below910Candbetween1400to1539C),W(d)alloftheabove(e)noneoftheabove.Ans:a

191.Recrystallisationtemperaturecanbeloweredby(a)purificationofmetal(b)grainrefinement(c)workingatlowertemperature(d)alloftheabove(e)noneoftheabove.Ans:d

192.Pearliteisacombinationof(a)ferriteandcementite(b)cementiteandgammairon(c)ferriteandaustenite(d)ferriteandirongraphite(e)pearliteandferrite.Ans:a

193.Austenitersacombinationof(a)ferriteandcementite(b)cementiteandgammairon(c)ferriteandaustenite(d)ferriteandirongraphite(e)pearliteandferrite.

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Ans:b

194.Thetransistorismadeof(a)silver(b)gold(c)copper(d)germanium(e)germansilver.Ans:d

195.Leadispouredintothejointbetweentwopipes.Thesepipesmaybemadeof(a)castiron(b)vitrifiedclay(c)asbestoscement(d)concrete(e)mildsteel.Ans:a

FerritemeterMF300F+MeasuresFerriteNumber(FN)Austenitic&duplexstainlesssteel

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