131. The machinability of steel is improved by adding
132. Nodular cast iron is produced by adding ________ to the molten cast iron.
133. Addition of manganese to aluminium results in
134. Addition of copper to aluminium results in
135. Addition of lead and bismuth to aluminium results in
136. Addition of silicon to aluminium results in
137. The hardness of steel primarily depends on
138. Beryllium bronze contains
139. Aluminium bronze contains
140. 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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