Sulphur in pig iron tends to make it___________________?
A. hard’
B. soft
C. ductile
D. tough
E. malleable
Engineering Materials
The following types of materials are usually the most ductile__________________?
The following types of materials are usually the most ductile__________________?
A. face-centred cubic lattice
B. body-centred cubic lattice
C. hexagonal close-packed lattice
D. all of the above
E. none of the above
In malleable iron, carbon is present in the form of___________________?
In malleable iron, carbon is present in the form of___________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
In grey cast iron, carbon is present in the form of____________________?
In grey cast iron, carbon is present in the form of____________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
The unique property of cast iron is its high ___________________?
The unique property of cast iron is its high ___________________?
A. malleability
B. ductility
C. surface finish
D. damg characteristics
E. hardness
The percentage of carbon in grey iron castings usually varies between __________________?
The percentage of carbon in grey iron castings usually varies between __________________?
A. 0.5 to 1%
B. 1 – 2%
C. 2.5 to 4.5%
D. 5 – 7%
E. 7-9%.
For the allotropic forms of iron, the points of arrest are __________________?
For the allotropic forms of iron, the points of arrest are __________________?
A. the points where no further change oc-curs
B. constant for all metals
C. the points where there is no further flow of metal
D. the points of discontinuity
E. the points where major changes take place
The crystal of alpha iron is ____________________?
The crystal of alpha iron is ____________________?
A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
A. molecular change
B. physical change
C. allotropic change
D. solidus change
E. atomic change
Ferromagnetic alpha iron exists in temperature range of________________?
Ferromagnetic alpha iron exists in temperature range of________________?
A. below 723°C
B. 770 – 910°C
C. 910-1440°C
D. 1400-1539°C
E. above 1539°C