Engineering Materials

A. 0.1 to 1.2%
B. 1.5 to 2.5%
C. 2.5 to 4%
D. 4 to 4.5%
E. 4.5 to 6.3%.

A. raw material for blast furnace
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. iron in molten form in the ladles
E. iron scrap

A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite

A. hard
B. high in strength
C. highly resistant to corrosion
D. heat treated to change its properties
E. least resistant to corrosion

A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling

A. allotropic change
B. recrystallisation
C. heat treatment
D. precipitation
E. austempering

A. high tensile strength
B. its elastic limit close to the ultimate breaking strength
C. high ductility
D. all of the above
E. none of the above

A. free form
B. combined form
C. nodular form
D. flat form
E. partly in free and partly in combined state

A. compressive strength
B. ductility
C. carbon content
D. hardness
E. surface finish

A. made by adding carbon in steel
B. refined from cast iron
C. an alloy of iron and carbon with varying quantities of phosphorus and sulphur
D. extensively used for making cutting tools
E. extremely brittle