- (A) %age of carbon
- (B) %age of alloying elements
- (C) heat treatment employed
- (D) method of manufacture
- (E) shape of carbides and their distribution in iron
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- (A) contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
- (B) is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
- (C) is produced by annealing process. It is soft, tough, and easily machined metal
- (D) is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
- (E) none of the above
- (A) improves wear resistance, cutting ability and toughness
- (B) refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
- (C) improves cutting ability and reduces hardenability
- (D) gives ductility, toughness, tensile strength and anticorrosion properties
- (E) raises its melting point
- (A) shot peening
- (B) nitriding of surface
- (C) cold working
- (D) surface decarburisation
- (E) under-stressing
- (A) brass
- (B) mild steel
- (C) cast iron
- (D) wrought iron
- (E) copper
- (A) 0.1 to 0.3%
- (B) 0.3 to 0.6%
- (C) 0.6 to 0.8%
- (D) 0.8 to 1.5%
- (E) 1.5 to 2.5%.
- (A) 0.05%
- (B) 0.15%
- (C) 0.3%
- (D) 0.5%
- (E) 0.7%.
- (A) acidic
- (B) basic
- (C) neutral
- (D) brittle
- (E) none of the above
- (A) steel
- (B) A1203
- (C) Si02
- (D) MgO
- (E) german silver
- (A) contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
- (B) is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
- (C) is produced by annealing process. It is soft, tough and easily machined metal
- (D) is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
- (E) none of the above
