Category: Engineering Materials

A. improve machinability
B. improve ductility
C. improve toughness
D. release stresses
E. reduce hardness and brittleness

A. increase
B. decrease
C. remain same
D. first increase and then decrease
E. show unpredictable behaviour

A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 10 : 90
E. 90 : 10

A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite

A. at which crystals first start forming from molten metal when it is cooled
B. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. at which change of allotropic form takes place
D. at which crystals grow bigger in size
E. at which crystals are destroyed on heating

A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite

A. F.C.C.
B. B.C.C.
C. H.C.P.
D. Orthorhombic crystalline structure
E. none of the above

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

A. iron
B. copper
C. aluminium
D. zinc
E. nickel

A. high resistance to rusting and corrosion
B. high ductility
C. ability of hold protective coating
D. easily weldable characteristics
E. uniform strength in all directions