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

Mold and Core Making 239
11. What is meant by green strength and dry strength as applied to a molding sand?
12. What is grain fineness number? Explain how you will use a sieve shaker for determining the
grain fineness of foundry sand.
13. How will you test the moisture content and clay content in molding sand?
14. Using the neat sketches, describe procedural steps to be followed in making dry sand mold.
15. Differentiate between the process of green sand molding and dry sand molding.
16. Sketch a complete mold and indicate on it the various terms related to it and their functions.
17. Discuss briefly the various types of molds.
18. Explain the procedure of making a mold using a split pattern.
19. Write short notes of the following:
(i) Floor molding
(ii) Pit molding
(iii) Bench molding
(iv) Machine molding
(v) Loam molding.
(vi) Plaster molding.
(vii) Metallic molding.
20. Describe the following:
(i) Skin dried molds
(ii) Air dried molds
(iii) CO 2
molds
(iv) Plaster molds.
21. What do you understand by the term gating system?
22. What are chaplets and why are they used?
23. Using neat sketches, describe various types of chaplets.
24. What do you understand by the term gating system?
25. What are the main requirements expected of an ideal gating system?
26. What are different types of gates? Explain them with the help of sketches stating the relative
merits and demerits of each.
27. What is chill? Explain in brief its uses.
28. What is meant by the term ‘risering’?
29. Discuss the common objectives of risers.
30. What advantages are provided by a riser?
31. What is the best shape of a riser, and why?
32. Why is cylindrical shape risers most commonly used?
33. What are the advantages of blind riser over conventional type riser?
34. Write short notes on the following terms:
(i) Use of padding
(ii) Use of exothermic materials and
(iii) Use of chills to help proper directional solidification.