The percentage of carbon is the least in
A.white cast iron
B.grey cast iron
C.wrought iron
D.stainless steel
Category: Materials of Construction Mcqs
In ferritic stainless steel the difference between the chromium percentage and seventeen times the carbon content is
A.less than 24%
B.greater than 24 %
C.greater than 12.5%
D.less than 12.5%
Corrosion is prevented or its rate is reduced by
A.increasing the resistance between abodic and cathodic area
B.decreasing anodic or cathodic polarization by increasing the diffusion of reactants and products
C.decreasing the resistance between anodic and cathodic areas
D.none of the above
Ferritic stainless steel is characterized by
A.a simple hexagonal crystal structure
B.a body-centred cubic crystal structure
C.a face-centred cubic crystal structure
D.none of the above
Iron sheets are galvanised to
A.increase lustre
B.prevent action of oxygen
C.prevent action of water
D.harden the surface
Which of the following is the least pure from of iron?
A.Pig iron
B.Wrought iron
C.Steel
D.Bessemer iron
Nitriding of steel is done in an electric furnace kept at about
A.1700?C
B.2200?C
C.510?C
D.125?C
Which of the following pairs of elements might form an alloy?
A.Zinc and lead
B.Iron and carbon
C.Iron and mercury
D.Mercury and platinum
Alpha iron is stable
A.upto 910?C
B.between 910 and 1403?C
C.above 1403?C
D.above 2000?C
Cast iron is obtained by remelting
A.pig iron and pouring into moulds
B.steel and pouring into moulds
C.wrought iron and pouring into moulds
D.iron ore and pouring into moulds
