Investment casting achieves a fine surface finish and high dimensional accuracy. Question 33 options: True False

What is the main advantage of using centrifugal casting for producing cylindrical parts?a) Excellent surface finishb) High dimensional accuracyc) Uniform grain structured) Efficient removal of impurities

Which of the following statements about surface finish that can be achieved in machining is the most appropriate one?  Assume that the machinery, tools and accessories involved are in good working conditions, operators are skilled and experienced and the relevant operation parameters are correct.Group of answer choicesTo achieve the same surface finish specification (Ra) on a cylindrical part made of mild steel round bar, turning is a better option than grinding. It is because turning can achieve a wide range of surface finish (e.g. from Ra 25µm to Ra 0.025 µm)Drilling produces coarser surface finish than reamingCasting produces finer surface finish than metal cutting, in generalSelecting a lower spindle speed on drilling machine produces a finer hole surface finishIn a drilling operation, select a higher spindle speed for a larger drill bit in order to achieve a finer hole surface finish

What factors influence the solidification time in casting processes, and how can these factors be controlled or optimized to achieve desired manufacturing outcomes?

What is the primary limitation of the true centrifugal casting process?a) High tooling and setup costsb) Limited to small partsc) Limited to symmetrical parts with rotational symmetryd) Limited to low melting point metals

Which are true about continuous casting? (Select all that apply) Select 3 correct answer(s) Question 32 options: The molten metal is cast into a continuous strand. The cross-section can be rectangular or circular. It is desirable for secondary metal-forming operations. The mold is reusable. Casting rates are low. It is used primarily for small pieces