Mcq ci
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This document provides 10 multiple choice questions and answers about cast irons. It tests knowledge about carbon composition in cast iron, the temperature at which pure iron transforms to FCC structure, alloying elements like silicon, sulfur, nickel, and titanium and how they affect properties of cast iron, and the microstructures responsible for appearances of different types of cast iron like white and malleable cast iron.
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Continuous cooling transformation (CCT) diagrams are mainly drawn for steels to show the transformation of phases that occur when a steel of constant composition is cooled at a certain rate, rather than being heated and then cooled rapidly. There are two types of CCT diagrams which can be drawn by changing some factors to obtain different curves. CCT diagrams are determined by measuring magnetic permeability and specific volume during continuous cooling, and slope changes on the diagrams signify a change in phase occurring.
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Mcq ci
- 1. Thisset of MaterialsScience Multiple Choice Questions&Answers(MCQs) focuseson“CastIrons”. 1. Which of the followingcanbe carboncompositionof castiron? a) 1% b) 1.5% c) 0.5% d) 2.5% ViewAnswer Answer:d Explanation:The carboncomposition incastironismore than 2% and hence only2.5% can be correct answeras all the answerlie outside the range. 2. Cast iron tendstobe brittle. a) True b) False ViewAnswer Answer:a Explanation:The above statementiscorrect.Castiron tendstobe brittle because of the presence of a highamountof carbon init. 3. At what temperature doespure ironturnintoFCCstructure? a) 800 °C b) 900 °C c) 910 °C d) 810 °C ViewAnswer Answer:c Explanation:Pure ironturnsintoitsFCCstructure at a temperature of 910 °C. This structure iscalled gamma ironor γ-iron. advertisement
- 2. 4. Which of the followingalloyingelementforcesthe carbonoutof the solution? a) Silicon b) Sulphur c) Nickel d) Titanium ViewAnswer Answer:a Explanation:Siliconisusedin acast iron to bringoutthe carbonfrom the solution.If alarge amount siliconisaddedgreycastiron isformed. 5. Which of the followingalloyingelementincrease hardness? a) Silicon b) Sulphur c) Nickel d) Titanium ViewAnswer Answer:b Explanation:The presence of sulfurincrease the hardnessof the alloybyreactingwithirontoform ironsulphide. 6. Which of the followingalloyingelementrefinespearlitestructure? a) Silicon b) Sulphur c) Nickel d) Titanium ViewAnswer Answer:c Explanation:Nickel isthe mostcommonalloyingelementincastiron.It helpsinrefiningthe pearlite and graphite structure. 7. Which of the followingalloyingelementisaddedasa degasser? a) Silicon
- 3. b) Sulphur c) Nickel d) Titanium ViewAnswer Answer:d Explanation:Titaniumisaddedasadegasserandit increasesthe fluidityof the alloyanditalsoacts as a deoxidiser. 8. Due to the presence of whichof the followingdoeswhitecastironappearwhite? a) Pearlite b) Ledeburite c) Martensite d) Cementite ViewAnswer Answer:d Explanation:Inwhite castiron,itappearsas a brokenwhite surface due tothe presence of cementite whichisametastable phase. 9. In malleable castiron,the graphite turnsintospheroidal particles. a) True b) False ViewAnswer Answer:a Explanation:The above statementistrue.Inmalleablecastiron,the graphite turnsintospheroidal particlesratherthanformingflakes. 10. What isthe formgraphite structure inductile castiron? a) Spheroidal b) Nodular c) Flakes d) Layers ViewAnswer
- 4. Answer:b Explanation:The graphite structure of aductile castironis nodularformand itis seenastiny noduleswithgraphite inlayersformingthe nodules.