Introduction to Basic Manufacturing Processes and ... - always yours

258 Introduction to Basic Manufacturing Processes and Workshop Technology
28. Describe briefly the shell casting process using neat sketches. State its advantages, disadvantages
and generation applications
29. Describe continuous casting process and discuss the important metallurgical features of the
billets produced by these methods.
30. Explain with the help of a neat sketch, the process of centrifugal casting.
31. What do you understand from centrifugal casting?
32. How are the centrifugal casting methods classified?
33. With the help of a neat diagram describe the process of true centrifugal casting. How can
this method be used for production of pipes?
34. Illustrate and describe the process of semi-centrifugal casting.
35. What is centrifuging casting?. Describe the process, stating its differences with other centrifugal
casting methods.
36. What are the advantages and disadvantages of true centrifugal casting?
37. Which materials are commonly used for making the molds for centrifugal casting?
38. Explain the difference with the help of sketches between true centrifugal casting, semicentrifugal
casting and centrifuge casting.
39. What is continuous casting? Name the various processes of continuous casting you know.
Describe in detail the reciprocating process of continuous casting.
40. How will you select the vertical and inclined axes of rotation in true centrifugal casting.
41. Write short notes on the following:
(i) Slush casting
(ii) Pressed casting
(iii) De Lavaud process for centrifugal casting
(iv) Moore sand spun process for centrifugal casting.
42 What are the general rules and principles to be followed in designing a casting?
43 What do you understand by foundry mechanization? Explain in brief.
44 What are the advantages of mechanization of foundry?
45 Describe the various units for which mechanization can be easily adopted.
46 What are the main factors which are responsible for producing defects in the castings?
47 Name the various defects which occur in sand castings and state their probable causes and
remedies?
48 List the defects generally occurring from the following, stating the precautions necessary to
prevent them:
(i) Improper pouring technique, (ii) Use of defective gating system
(iii) Poor or defective cores, (iv) High moisture content in sand.
49. Discuss briefly the causes and remedies of the following casting defects:
(i) Blow holes, (ii) Porosity, (iii) Hot tears
(iv) Shrinkage cavities, (v) Scabs, and (vi) Gas porosity
50. Write short notes on the following casting defects:
(i) Sand inclusions, (ii) Cuts and washes, (iii) Misrun and cold shuts,
(iv) Honey combing, (v) Metal penetration, (vi) Drops,
(vii) Warpage and (vii) blow holes