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Materials Engineering Online Test Two
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Added on 2020-11-30
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This online test covers topics such as ceramics, polymers, composites, fatigue, and more. It includes 40 multiple choice questions with instant results and explanations. The questions cover topics such as sintering, creep, fracture toughness, and tensile strength.
Materials Engineering Online Test Two
Added on 2020-11-30
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Online Test Two Q: Photovoltaic Semi conducting ceramics such as Indium Galium Selinide A: Produce energy as part of a p-n junction CORRECT Q: How would the strength of a ceramic component be enhanced during manufacture? A: Hot isostatic pressing CORRECT Q: Solidified steel crystal structure is A: body centred cubic or face centred cubic. CORRECT Q: Which is the incorrect statement from the following list A: Ceramics have poor high temperature properties. CORRECT Q: Which is the correct statement from the following list: Engineers favour the use of composites in aerospace applications because A: They have excellent strength to density properties CORRECT Q: creep can be defined as; A: Increasing strain on a part with constant stress at high Temperatures. CORRECT Q: A ceramic material has a fracture toughness value of 4.5MPa m-1/2and is under a tensile stress of 1000MPa, where Y=1 what is the critical crack dimension before brittle fracture. A: 20um CORRECT Q: Select the correct answer form the following statements; Increasing the initial stress during a creep test A: Lowers the temperature during the testing process WRONG Q: Which is the correct statement from the following list To produce a ceramic the ceramic powder is A: mixed with binder and dispersant CORRECTQ: From the following list identify the incorrect statement Ceramic acetabular components used in replacement hip joints must have the following properties
A: High friction coefficient CORRECT Q: The tensile strength of ceramics is approximately related to the porosity by the expression UTS=UTS0e-nPwhere P is the volume fraction of pores in the solid, UTS0is the tensile strength at zero porosity and the exponent n=4, UTS0=150Mpa and the porosity is 20% What is the calculated value of the UTS. A: 673MPa CORRECT Q: From the following statements, select the correct answer; Side groups on polymer mer units A: decreases polymer chain flexibility CORRECT Q: Polyethylene thermoplastic polymers is; A: always very flexible WRONG Q: From the following statements, select the correct answer; Thermoplastic polymers; A: soften when heated CORRECT Q: Elastomeric polymers are... A: melt when heated WRONG Q: Which is the correct statement from the following list In producing a fully dense ceramic, the sintering process is driven by; a: diffusion within powder particles CORRECT Q: Select the correct answer from the list Polymeric materials are; A: can be both amorphous and crystalline CORRECT Q: Which is the incorrect statement from the following list A laminar composite is A: composed of alternating layers of fibre materials WRONGQ: Cermet composites have a better shock resistance when they are used as cutting tools when A: the % of matrix decreases WRONG
Q: Which is the correct statement from the following list Under tensile loading the bond strength of fibres in a matrix must A: be greater than the tensile strength of fibre CORRECT Q: Which is the correct statement from the following list Engineers favour the use of composites in aerospace applications because A: They have excellent strength to density properties CORRECT Q: Choose the correct answer from the following list. Dispersion strengthened composites A: Have enhanced creep properties CORRECT Q: Building Integrated Flexible Photo Voltaic cells are A: 10-15% efficient at conversion of solar energy into electrical energy CORRECT Q: Which factor DOES NOT reduce the fatigue life of a component A: carburising the surface CORRECT Q: Which statement in the following list is incorrectThe main service requirements of the matrix material in a composite are A: should not be strongly bonded to the matrix to allow cracks to propagate CORRECT Q: Colours in polymers fillers in polymers are produced by A: the addition of pigments and dyes CORRECT Q: Tape casting of Al2O3tiles is used for producing; A: IC chips CORRECT Q: The largest use of polymers in industry A: consumer products WRONG Q: Addition reaction used in the polymerisation process A: need initiation catalysts CORRECT Q: A steel component has a hardness of 225HB (Brinell hardness) calculate its approximate ultimate tensile strength A: 775MPa CORRECT EXAM OVER
Q: The modulus of elasticity of a ceramic is approximately related to the porosity by the expression E=E0(1 - 1.9P + 0.9P2) where E0is the modulus at zero porosity. If a fully dense ceramic has the properties of and E0=300Gpa what is the resulting modulus at 40% porosity.A: 115Gpa CORRECT Q: A brittle fracture of a test specimen in an impact test is usually characterised by;A: A bright sparkling surface CORRECT Q: Select the correct answer from the list Polymeric materials are; A: Can be both amorphous and crystalline CORRECT Q: Which statement in the following list is incorrectThe main service requirements of the matrix material in a composite are A: should not be strongly bonded to the matrix to allow cracks to propagate. CORRECT Q: Select the correct answer from the list Polymer crystallinity A: does not change the polymer density WRONG Q: Which of the following statements is NOT correct Glass transition temperature is increased by; A: Polymer chain cross links CORRECT Q: Which is the correct statement from the following list In producing a fully dense ceramic, the sintering process is driven by; A: diffusion within powder particles WRONG
Q: Which is the incorrect statement from the following list Sintering can be aided by; A: larger powder particles CORRECT Q: Tape casting of Al2O3tiles is used for producing;A: IC chips CORRECT Q: From the following statements, select the correct answer; Side groups on polymer mer units A: decrease polymer chain flexibility CORRECT Q: Elastomeric polymers are;-A: are highly flexile thermoplastic polymers WRONG Q: Choose the correct answer from the following list. Dispersion strengthened composites A: have enhanced creep properties CORRECT Q: Which is the correct statement from the following list To produce a ceramic the ceramic powder is A: mixed with binder and dispersant CORRECT Q: Which is the correct statement from the following list Under tensile loading the bond strength of fibres in a matrix must A: be greater than the tensile strength of the fibre CORRECT Q: A ceramic material has a fracture toughness value of 4.5MPa m-1/2and is under a tensile stress of 1000MPa, where Y=1 what is the critical crack dimension before brittle fracture.A: 20um CORRECT Q: From the following statements, select the correct answer;
Thermoplastic polymers; A: soften when heated CORRECT Q: From the following list identify the incorrect statement Ceramic acetabular components used in replacement hip joints must have the following properties A: high friction coefficient CORRECT Q: A thermoplastic material filled with 20% glass fibre wouldA: increase the materials ductility WRONG Q: Which of the following statements concerning thermoplastics is incorrectA: increasing the temperature increases the ductility CORRECT Q: Which statement from the following list is incorrectA: Ceramics have excellent thermal conduction properties CORRECT Q: Which of the following statements is incorrectA: Thermosetting polymers are used in recycling CORRECT Q: When measuring fatigue strength of a material the results are represented on a graph whereA: Stress is plotted against number of stress cycles CORRECT Q: The tensile strength of ceramics is approximately related to the porosity by the expression UTS=UTS0e-nPwhere P is the volume fraction of pores in the solid, UTS0is the tensile strength at zero porosity and the exponent n=4, UTS0=150Mpa and the porosity is 20% What is the calculated value of the UTS. A: 673Mpa CORRECT Q: Interstitial solid solution hardening isA: not normally employed for hardening metals WRONG
Q: Select the correct answer form the following statements; Increasing the initial stress during a creep testA: increases the rate of creep WRONG Q: Which is the incorrect statement from the following listA: ceramics have poor high temperature properties CORRECT Q: Which is the incorrect statement from the following list A laminar composite is A: composed of particle reinforced elements CORRECT Q: For a specimen under a tensile stress of 100N/m2and having a “notch” type flaw whose length is 3mm with a tip radius of 50μm, calculate the stress at the tip of the notch.A: 1649 Nm2 CORRECT Q: From the following list identify the incorrectstatement Ceramic acetabular components used in replacement hip joints must have the following properties A: high friction coefficient CORRECT Q: The largest use of polymers in industryA: packaging CORRECT EXAM OVER:
Q: The largest use of polymers in industryA: Packaging CORRECT Q: From the following statements, select the correct answer;Thermoplastic polymers;A: soften when heated CORRECT Q: From the following list identify the incorrectstatementCeramic acetabular components used in replacement hip joints must have the following propertiesA: HFC CORRECT Q: Which is the correct statement from the following list Engineers favour the use of composites in aerospace applications becauseA: excellent strength to density properties CORRECT Q: Elastomeric polymers are;-A: thermoplastic polymers with no cross links between chains WRONG Q: Select the correct answer from the list:Vulcanisation is;A: making synthetic rubber for road tyres WRONG Q: Addition reaction used in the polymerisation processA: need initiation catalysts CORRECT Q: Which is the incorrect statement from the following list In terms of electrical properties ceramics can
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