Metal Casting Tests

1. Which of the following is not a drilling or boring tool?

2. Up to what temperature can molten steels be produced in a side blown converter?

3. Which of the following characteristics is mainly considered for the solidification of castings?

4. The buoyancy force is generated only due to the weight of the core inside the mould.

5. What should be the lowest sulphur pick-up in the acid-cupola reaction?

6. What is mixed with calcium hydroxide on sand for CO₂ cured polyacrylate?

7. Gimlet is which of the following tool?

8. Continuous extraction of heat is necessary to ensure higher mould life and better casting cycle times.

9. Iron needs higher temperature ranges for its extraction.

10. In an induction furnace, mixing and melting rates are altered by?

11. Which of the following is not a property of a crucible?

12. Which current is helpful in detecting sub surface discontinuities?

13. Which refractory sand has the best moulding material?

14. A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?

15. Computerization in dimensional inspection improves the speed and accuracy of measuring casting dimensions.

16. Which of the following molding methods have the highest production rate?

17. Contours, cavities and passages in the casting can be possible without placing of any cores in the casting.

18. Runners, gates and risers are attached to the pattern to __________

19. For proper venting, the pouring time is increased which allow easy escape out of gases from the mould without inducing any defects.

20. A dendritic crystal growth structure is formed by the difference in progress of crystallization at different points in the casting material.

21. Palygorskite and sepiolite clay minerals generally have similar fibrous structures.

22. The infrared radiation passes through what before entering into the fluidized bed?

23. How much time does a centrifugal muller take to mix the core ingredients?

24. What is typically the frequency used in ultrasonic inspection?

25. The transfer of heat across a gap (an interface between mould and casting) is given by_____

26. With what does iron react to give out Ferrous Oxide?

27. In cold chamber die casting, rapid cooling of the castings is done as compared to the hot chamber die casting.

28. What is the breadth size range of a clay particle?

29. Name the missing part of the pattern in the diagram labelled as (?)?

30. Which of the following is not charged in the open hearth furnace?

31. What can be the maximum pressure to be given to plastic for blow molding process?

32. Which of the following will not affect insulation?

33. Production of crucibles is inexpensive.

34. Which of the following processes is responsible for the emission of particulate matter in the foundry?

35. In mechanized foundry, rubber conveyor cannot be used for long time during production of castings.

36. In continuous casting technology, solidification of casting starts in a thick sand mould of a closed structure.

37. In pressure die castings, production rate is low.

38. What is the purpose of auxiliary tuyeres?

39. After preparation of cores, cores on the core plates are sent for what?

40. Green sand cores are not suitable for producing very complex shapes of castings.

41. What is the purpose of strainer in the gating system?

42. In dimensional inspection, the cost involved in measuring tools is very high.

43. Which of the following types of light is preferred for using fluorescent penetrant in liquid penetrant testing (LPT) method?

44. What is the color of pure magnesium metal?

45. In pressure die casting, what is the minimum pressure that can be applied?

46. In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?

47. Uniform and homogenous mixture of core sand can be achieved by manual operation.

48. Which of the following synthetic resins are used for mixing with sand in shell moulding?

49. Degassing process during the formation of castings can prevent inclusion of hydrogen absolutely.

50. A heavy surface finishing is always required for components made in injection moulding machine.