Sulphur in pig iron tends to make it___________________?
Sulphur in pig iron tends to make it___________________? A. hard’ B. soft C. ductile D. tough E. malleable
Sulphur in pig iron tends to make it___________________? A. hard’ B. soft C. ductile D. tough E. malleable
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___________________? A. cementite B. free carbon C. flakes D. spheroidsE. nodular aggregates of graphite
In grey cast iron, carbon is present in the form of____________________? A. cementite B. free carbonC. flakes D. spheroids E. nodular aggregates of graphite
The unique property of cast iron is its high ___________________? A. malleability B. ductility C. surface finishD. damg characteristics E. hardness
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 __________________? A. the points where no further change oc-curs B. constant for all metals C. the points where there is no further flow of metalD. the points of discontinuity…
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. molecular change B. physical changeC. allotropic change D. solidus change E. atomic change
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