Solved Important Questions

SOLVED QUESTIONS

1. How are patterns classified? Describe any two types with sketches and state the uses of each of them.

Refer chapter 1.5 in Page 1.2 for patterns classification and chapter 1.5.1 & 1.5.2 in Page 1.3 for description of two types of patterns.

2. With reference to metal casting, explain the following types of patterns with suitabie sketches of examples:

(i) Solid pattern

(ii) Split pattern

(iii) Loose piece pattern

(iv) Sweep pattern

Refer chapter 1.5 in Page 1.2.

3. Explain the various types of pattern used in moulding making.

Refer chapter 1.5 in Page 1.2.

4. What are pattern allowances? Explain briefly each.

Refer chapter 1.7 in Page 1.10.

5. What are constituents of moulding sand? Give its details.

Refer chapter 1.8.1 in Page 1.14.

6. List the various types of moulding sand and write short notes on Green sand and dry sand.

Refer chapter 1.8.2 in Page 1.18.

7. Explain various properties required for the moulding sand.

Refer chapter 1.8.3 in Page 1.19.

8. What are the main characteristics of mould sand?

Refer chapter 1.8.3 in Page 1.19.

9. Explain the preparation of moulding sand process.

Refer chapter 1.8.4 in Page 1.21.

10. List out the moulding tools and explain any seven in detail.

Refer chapter 1.8.5 in Page 1.22.

11. Discuss any four sand testing methods.

Refer chapter 1.8.6 in Page 1.26.

12. What is core? Describe the different types of cores used.

Refer chapter 1.9 in Page 1.38 for definition of core and refer chapter 1.9.8 in Page 1.49 for types of cores.

13. What are essential qualities of a core? and explain each.

Refer chapter 1.9.1 in Page 1.39.

14. Explain the various steps involved in sand core manufacturing.

Refer chapter 1.9.3 in Page 1.49.

15. What are the functions of core binders? Describe the various core binders.

Refer chapter 1.9.4 in Page 1,40.

16. Explain any four types of core boxes with suitable sketches.

Refer chapter 1.9.5 in Page 1.41.

17. Mention the various types of core ovens. Explain briefly each.

Refer chapter 1.9.6 in Page 1.43.

18. List various core making methods. Explain any two of them with suitable sketches.

Refer chapter 1.9.7 in Page 1.45.

19. What are the different types of cores? Explain any three types of cores with neat sketches.

Refer chapter 1.9.8 in Page 1.49.

20. Write shot notes on core sand testing.

Refer chapter 1.9.9 in Page 1.52.

21. How is green sand mould prepared?

Refer chapter 1.10.1 (1) in Page 1.54.

22. Explain loam sand moulding with a neat sketch. Mention its advantages and disadvantages.

Refer chapter 1.10.1 (3) in Page 1.56.

23. What are the various moulding methods? Explain them.

Refer chapter 1.11 in Page 1.57.

24. What the different types of furnace used in foundry? Describe in detail with neat sketches any one of them.

Refer chapter 1.13 in Page 1.62.

25. Explain the construction and operation of blast furnace with neat sketch.

Refer chapter 1.13.1 in Page 1.63.

26. Describe the constructional feature and working of a cupola furnace.

Refer chapter 1.13.2 in Page 1.64.

27. What are the different types of crucible furnaces? Explain any one with neat sketch.

Refer chapter 1.13.3 in Page 1.67.

28. How does the electric arc furnace melt the metal? Explain direct arc furnace and compare with indirect arc furnace.

Refer chapter 1.13.4 in Page 1.69.

29. Explain induction furnace. Mention applications and advantages.

Refer chapter 1.13.4 (3) in Page 1.72.

30. Describe shell moulding process with neat sketches. Give the advantages of this process.

Refer chapter 1.14.1 in Page 1.73.

31. Enumerate the steps on sequence for producing Shell moulding.

Refer chapter 1.14.1 in Page 1.73.

32. Describe the procedure of making castings by the investment casting process.

Refer chapter 1.14.2 in Page 1.75.

33. Explain the various steps involved in 'Lost wax process' with suitable sketches.

or

Explain lost wax processes with neat sketch.

Refer chapter 1.14.2 in Page 1.75.

34. Compare precision investment casting and shell moulding form the point of process, product and applications.

Refer chapters 1.14.1 in Page 1.73 and 1.14.2 in Page 1.75 for shell moulding and investment casting respectively.

35. Explain with a neat sketch the hot chamber die casting process. How does the cold chamber process differ from hot chamber process?

Refer chapter 1.14.1 (1) in Page 1.80.

36. What is the drawback of hot-chamber die casting with respect to casting of different metals?

Refer chapter 1.14.1 (1) in Page 1.80.

37. With neat diagrams explain the process of cold-chamber die casting operation.

Refer chapter 1.14.1 (2) in Page 1.80.

38. Describe with a neat sketch of cold chamber die casting machine. Give its advantages and limitations.

Refer chapter 1.14.1 (2) in Page 1.80.

39. Explain with a neat sketch the gravity die casting process.

Refer chapter 1.14.5 in Page 1.82.

40. Explain the process of centrifugal casting with suitable sketch and state its applications.

Refer chapter 1.14.6 in Page 1.83.

41. Explain any one type of centrifugal casting with a neat diagram.

Refer chapter 1.14.6 in Page 1.83.

42. Explain how pipes and cylinder liners are made by centrifugal casting process.

Refer chapter 1.14.6 in Page 1.83.

43. Explain the continuous casting process with a neat sketch.

Refer chapter 1.14.7 in Page 1.84.

44. Briefly explain the carbon dioxide moulding process and state two important merits and demerits.

or

Briefly explain the principle, operation, advantages, disadvantages and application of CO2 moulding.

Refer chapter 1.14.8 in Page 1.86.

45. Describe with a neat sketch the stir casting process. Give its advantages and limitations.

Refer chapter 1.14.9 in Page 1.89.

46. Why are steels more difficult to cast than cast irons?

Refer chapter 1.15 in Page 1.89.

47. What are the operations required in sand casting after the casting is removed from the mould? Write briefly about any two of them.

Refer chapter 1.16 in Page 1.89.

48. Enumerate the casting defects and suggest suitable remedies.

Refer chapter 1.15 in Page 1.93.

49. Name any five casting defects and explain the remedies for those defects. 

Refer chapter 1.18 in Page 1.93.

50. Write a note on casting defects, cause and remedies.

Refer chapter 1.18 in Page 1.93.