Question

1. Define manufacturing and list major manufacturing processes that are employed to manufacture the engineering materials 2. Why it is important to provide venting system for the escape of gases from the mold cavity? 3. What type of problems/defects can occur if mold material provides too much restraint to a solidifying and cooling liquid? 4. Sketch a gating system that is employed to manufacture metallic castings? 5. What is a draft and why it is used while designing a pattern? 6. Why it is desirable to promote directional solidification in a casting? 7. How a chill zone is different from columnar and equiaxed zones in terms of microstructure and mechanical strength? Include a sketch, 8. What is the effect of sand mold erosion on properties of the casting? What principles are applied to prevent the erosion whille designing the gating system for the castings? 9. How yield of a casting process is estimated? 10. What type of riser would you choose if the yield is to be increased: Cylindrical or spherical? 11. What would the effect of shrinkage allowance on the dimensions of a pattern: increase or decrease? 12. Which form of the riser would be more economical: cylindrical or spherical? 13. What are hot tears and what causes them to form? 14. What type of a binder is used in CO, molding process? 15. What material is used as a binder in shell molding process? 16. Why the investment casting is called lost wax process? 17. What are attractive features of the evaporative pattern casting process? 18. Which of the following processes requires more capital investment: Green sand molding, die casting, or centrifugal casting? 19, What features affect the life of a permanent mold 20. Are the risers employed in the die casting process? 21. Contrast structure and properties of outer and inner surfaces of centrifugal castings 22. Which casting process is more likely to cause segregation in castings? 23. A steel pipe can be manufactured through metal forming followed by welding, and through centrifugal casting: which process would you prefer, and why? 24. How would you estimate velocity of a freely falling molten metal from ladle to a pouring basin? 25, Why the sprue is tapered? 26. What type of pattern material is employed in an evaporative pattern casting process? 27. What are common aspects between fusion welding and casting processes? 28. An elbow for the piping system is to be cast; list any two casting processes that can be employed for this purpose. Assume that thread is to be produced after the elbow has been cast. 29. Define paring line, and show it through a sketch, and identify a process that produces parts free of parting line. 30. A bronze bushing is to be manufactured; the bushing requires very close dimensional tolerances, and is to be used in the as-cast condition; which of the following processes would you choose, and why? Assume that number of parts to be produced is 1000 Green sand molding a. b. Die casting c. Investment casting

i need answer of questions from 11 to 30

Answer 1

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