MSE1 Strength of polymers may be enhanced bySelect one:a. All of the choicesb. Increasing degree of crytallinityc. Radiation-induced crosslinkingd. Increasing molecular weightFeedbackThe correct answer is: All of the choices2 Which of the following enhances corrosion rate?Select one:a. Deformationsb. Process annealingc. decreasing temperatured. None of the choicesFeedbackThe correct answer is: Deformations3 Schottkey and Frenkel defects are paint dislocations that result in the material:Select one:a. Gaining an increase in net chargeb. No change in net chargec. Either a decrease or increase in net charged. Gaining a decrease in net chargeFeedbackThe correct answer is: No change in net charge4 Easily drawn into fibersSelect one:a. fiber glassb. none of the choicesc. borosilicated. fused silicaFeedbackThe correct answer is: fiber glass5 The fraction of solid sphere volume in a unit cell is known as:Select one:a. Coordination numberb. Atomic volume fractionc. Atomic mass unitd. Atomic packing factorFeedbackThe correct answer is: Atomic packing factor6 Which of the following glasses are easily formed?Select one:a. None of the choicesb. Borosilicate glassc. Amorphous silicad. Soda-lime gasFeedbackThe correct answer is: Soda-lime gas7 External surfaces are examples of these defects:Select one:a. volume defectsb. Linear Defectsc. Interfacial defectsd. Point defectsFeedbackThe correct answer is: Interfacial defects8 The recrystallization temperature ranges between 0.3 to 0.7 of the absolute melting temperature. How will large internal stresses in the material affect the actual temperature before recrystallization occurs?Select one:a. Increase significantlyb. Decrease significantlyc. Increase slightlyd. No effectFeedbackThe correct answer is: Decrease significantly9 Inherently corrosion resistant and frequently utilized at oxidizing, elevated temperatures.Select one:a. Metalsb. Ceramicsc. Semiconductorsd. PolymersFeedbackThe correct answer is: Ceramics10 Coordination number of Zinc blende ceramic crystal structureSelect one:a. 2b. 4c. 6d. 8FeedbackThe correct answer is: 411Chemical substance added to polymers to impart UV and oxidation resistanceSelect one:a. Inhibitorsb. Epoxiesc. Coatingsd. StabilizersFeedbackThe correct answer is: Stabilizers12 A furnace whose heat and reactant are derived from one material only.Select one:a. Electric arc furnaceb. Bessemer furnacec. Blast furnaced. None of the choicesFeedbackThe correct answer is: Blast furnace13 Particle coalescence of a powdered aggregate by diffusion that is accomplished by firing at elevated temperatureSelect one:a. Isostatic compressionb. Sinteringc. Pressingd. Uniaxial compressionFeedbackThe correct answer is: Sintering14 Porcelain, tablewares and pottery are examples ofSelect one:a. Glass-ceramicsb. Pressingc. whitewaresd. Structural clay productsFeedbackThe correct answer is: whitewares15 Which does not belong to the groupSelect one:a. bakeliteb. polyethylenec. PVCd. teflonFeedbackThe correct answer is: bakelite16 A homogenous portion of a system that has uniform physical and chemical characteristicsSelect one:a. microstructureb. phasec. latticed. All of the choicesFeedbackThe correct answer is: phase17 It is a material whose atoms are situated in a repeating or periodic array over large atomic distances BUT found in varying orientations.Select one:a. Amorphous materialb. All of the choicesc. Polycrystalline materiald. Crystalline materialFeedbackThe correct answer is: Polycrystalline material18 It refers to the series of possible alloys consisting of same components but without regard to alloy composition.Select one:a. componentsb. systemc. solutiond. matrixFeedbackThe correct answer is: system19 Material characterized by high electrical and thermal conductivity due to electron delocalization:Select one:a. Metalsb. Ceramicsc. Polymersd. CompositesFeedbackThe correct answer is: Metals20 Internal voids and foreign materials are examples of these.Select one:a. Volume defectsb. Point defectsc. Linear Defectsd. Interfacial defectsFeedbackThe correct answer is: Volume defects21 Stress at fracture of ceramicsSelect one:a. Creepb. Tensile Strengthc. Flexural strengthd. Modulus of elasticityFeedbackThe correct answer is: Flexural strength22 For metals, electrical resistivity increases withSelect one:a. temperatureb. All of the choicesc. Impurity concentrationd. Plastic deformationFeedbackThe correct answer is: All of the choices23 Which of the following is/are true for a metal that is subjected to tensile or compressive stress?Select one:a. A metal that has NOT undergone plastic deformation will rebound slightly.b. A metal will undergo elastic deformation D. A and B before plastic deformationc. A metal that has undergone plastic deformation will return to its original formd. None of the choicesFeedbackThe correct answer is: A metal will undergo elastic deformation D. A and B before plastic deformation24 Which of the following transformations is not found in the Iron-iron carbide phase diagram?Select one:a. Eutecticb. Eutectoidc. Peritecticd. PeritectoidFeedbackThe correct answer is: Peritectoid25 examples of these.Select one:a. Point defectsb. Linear Defectsc. Interfacial defectsd. Volume defectsFeedbackThe correct answer is: Volume defects26 Which of the following furnaces has the least amount of entrained gasses?Select one:a. Bessemer furnaceb. All of the choicesc. Blast furnaced. Electric arc furnaceFeedbackThe correct answer is: Electric arc furnace27 In metals, necking distorts the tensile strength test. phenomenonSelect one:a. Plastic deformationb. Increase in forcec. Area reductiond. All of the choicesFeedbackThe correct answer is: All of the choices28 At which part of the blast furnace does heat recovery between the incoming feed and outgoing gas occur?Select one:a. Shaftb. Hearthc. All of the choicesd. TuyeresFeedbackThe correct answer is: Shaft29 Which of the following applications will result in the most strain hardening?Select one:a. Quenchingb. Hot-forging a connecting rodc. Flattening a lead shot using a hammerd. Isostatic powder metallurgyFeedbackThe correct answer is: Flattening a lead shot using a hammer30 have the ability to be deformed and then brought back to their original formSelect one:a. elastomersb. glass-ceramicsc. polyamidesd. polyestersFeedbackThe correct answer is: elastomers31 Soften when heated and hardened when cooledSelect one:a. Vulcanized rubberb. Epoxiesc. Thermoplastsd. ThermosetsFeedbackThe correct answer is: Thermoplasts32 Failure of the material as a result of high temperature stress is?Select one:a. Creepb. Fracturec. All of the choicesd. FatigueFeedbackThe correct answer is: Creep33 Which is/are true from the statements below?Select one:a. Donor impurities introduces excess holesb. None of the choicesc. Semiconductors are ionic bonded compoundsd. Acceptor impurities introduces excessFeedbackThe correct answer is: None of the choices34 Which material would have undergone the supercooled liquid state upon cooling from the liquid state?Select one:a. Crystalline glassb. Amorphous glassc. None of the choicesd. A metalFeedbackThe correct answer is: Amorphous glass35 Which does not belong to the groupSelect one:a. Lonsdaleiteb. fullerinec. C70d. C540FeedbackThe correct answer is: Lonsdaleite36 Usually observed in the welding of stainless steelSelect one:a. Selective leachingb. intergranular corrosionc. Pittingd. Stress corrosionFeedbackThe correct answer is: intergranular corrosion37 Which is/are true on vulcanizationSelect one:a. cross-linking in elastomersb. all of the choicesc. non-reversible chemical reaciond. carried out at velevated temperatureFeedbackThe correct answer is: all of the choices38 It is not subject to creepSelect one:a. None of the choicesb. Glassc. Medium Carbon Steeld. BronzeFeedbackThe correct answer is: None of the choices39 A phenomenon where some metals and non metals have more than one crystal structure.Select one:a. None of the choicesb. Alloyingc. Crystalizationd. PolymorphismFeedbackThe correct answer is: Polymorphism40 Engineering materials are characterized mainly by theirSelect one:a. All of the choicesb. Propertiesc. Structured. ProcessingFeedbackThe correct answer is: All of the choices41 Material having an AX-type crystal structure.Select one:a. Rock-Saltb. Perovskitec. Zinc Blendd. Cesium ChlondeFeedbackThe correct answer is: Rock-Salt42 Which statement/s/is/are true about ceramicsSelect one:a. Hardnest known materials are ceramicsb. All of the choicesc. Both cystalline and non crystalline states are possible for ceramicsd. Pores act as a stress concentratorsFeedbackThe correct answer is: All of the choices43 Upsets or changes the orderly array of atoms or molecules in the crystal structure.Select one:a. volume dislocationb. point dislocationc. all of the choicesd. surface dislocationFeedbackThe correct answer is: all of the choices44 Which has the least reinforcement efficiencySelect one:a. Fiber randomly and uniformly distributed stress direction any directionb. None of the choicesc. Parallel fiber orientation; stress direction perpendiculard. Parallel fiber orientation; stress direction same directionFeedbackThe correct answer is: Parallel fiber orientation; stress direction same direction45 Fire retardants in polymers work bySelect one:a. None of the choicesb. Interfering without the combustion process in thec. Initiating a combustion reaction that producesd. Being intrinsically non-combustibleFeedbackThe correct answer is: Initiating a combustion reaction that produces46 A piece of aluminium wire is subjected to tensile stress. The initial length of the wire is 200mm which has an Elastic ratio of 69GPa. What is the change in length if the applied stress is 400 MPa?Select one:a. 11.6mmb. 1.16mmc. 116mmd. 0.116mmFeedbackThe correct answer is: 1.16mm47 Consist of two strong and stiff sheet faces that are separated by a core material.Select one:a. Laminar compositesb. Sandwich panelsc. Fiber-reinforced compositesd. None of the choicesFeedbackThe correct answer is: Sandwich panels48 Forming technique whereby a material is forced by compression, through a die orificeSelect one:a. Transfer moldingb. Castingc. Extrusiond. Blow moldingFeedbackThe correct answer is: Extrusion49 Increasing the strength of glass by introduction of residual compressive stresses within the outer surfaceSelect one:a. firingb. annealingc. devitrificationd. temperingFeedbackThe correct answer is: tempering50 Polymorph of carbon used for grinding, cutting polishing.Select one:a. Graphiteb. Diamondc. None of the choicesd. FullereneFeedbackThe correct answer is: Diamond51 The total number of atoms in a unit cell of a body-cerntered cubic lattice is:Select one:a. 4b. 2c. 0.54d. 6FeedbackThe correct answer is: 252 Used for most chemical containers for its chemical resistance.Select one:a. rvcb. ASSc. HDPEd. PolyesterFeedbackThe correct answer is: HDPE53 Which materials can be designed to become immune to fatigue?Select one:a. All of the choicesb. Ferrous alloysc. Copperd. AluminumFeedbackThe correct answer is: Ferrous alloys54 Pores and cracks are examples of these.Select one:a. Volume defectsb. Interfacial defectsc. Point defectsd. Linear DefectsFeedbackThe correct answer is: Volume defects55 Strengthening of alloys by physical or chemical changes in the external surface only.Select one:a. Precipitation hardeningb. Case hardeningc. Quenchingd. All of the choicesFeedbackThe correct answer is: Case hardening