31. The machinability of steel is improved by adding
32. Nodular cast iron is produced by adding ________ to the molten cast iron.
33. Addition of manganese to aluminium results in
34. Addition of copper to aluminium results in
35. Addition of lead and bismuth to aluminium results in
36. Addition of silicon to aluminium results in
37. The hardness of steel primarily depends on
38. Beryllium bronze contains
39. Aluminium bronze contains
40. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will
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