A. in which atoms align themselves in a geometric pattern upon solidification
B. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. which is not attacked by phosphorous
D. which emits fumes on melting
E. none of the above
Engineering Materials
Engineering Materials
A. zinc
B. lead
C. silver
D. glass
E. brass
A. electroplating
B. cyaniding
C. induction hardening
D. nitriding
E. flame hardening
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. makes steel hard
A. brass
B. cast iron
C. aluminium
D. steel
E. non-ferrous alloys.
A. cobalt
B. nickel
C. vanadium
D. iron
E. carbon
A. improve machinability
B. improve ductility
C. improve toughness
D. release stresses
E. reduce hardness and brittleness
A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32
A. relieve stresses
B. harden steel slightly
C. improve machining characteristic
D. soften material
E. permit further cold working
