Engineering Materials

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. 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 am is obtained by cooling rapidly. It i: almost unmachinable
C. is produced by annealing process. I is soft, tough and easily machinec metal
D. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
E. none of the above is true

A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. none of the above

A. it easily machinable
B. it brittle
C. it hard
D. the casting unsound
E. increases the fluidity

A. 3- 5
B. 5-7
C. 7-10
D. 10-15
E. 15-22

A. cast iron
B. pig iron
C. wrought iron
D. malleable iron
E. white iron