An increase in the carbon content of a steel
A.increases its strength
B.decreases its strength
C.increases its ductility
D.none of the above
Category: Materials of Construction Mcqs
Electrochemical reactions at the anode are oxidation reactions. Which one of the following is not an anodic reaction?
A.Cl- ? Cl+ e-
B.Fe3+ + e- ? Fe2+
C.Cu ? Cu2+ + 2e-
D.Zn ? Zn2+ + 2e-
Percentage of carbon is same in
A.cast iron and pig iron
B.cast iron and steel
C.pig iron and steel
D.pig iron and wrought iron
When Fe2+ changes to Fe3+ in a reaction
A.it loses an electron
B.it gains an electron
C.it gains a proton
D.it loses a proton
The presence of impurities in iron
A.lowers the melting point
B.raises the melting point
C.has no effect on melting point
D.makes iron malleable
An increase in the carbide/graphite ratio in cast iron tends to
A.increase the hardness
B.increase the brittleness
C.decrease the ductility
D.all of the above
The carbon content is steel varies from
A.0.1 to 1.50%
B.0.35 to 2.5%
C.2 to 4%
D.5 to 8%
Corrosion resisting properties of cast iron are very much improved by the addition of 12-15 per cent of
A.vanadium
B.tungsten
C.silicon
D.phosphorus
Which of the following has maximum tensile strength?
A.White cast iron
B.Grey cast iron
C.Pig iron
D.Nodular cast iron
The tempering of steel makes it
A.hard
B.soft
C.heavy
D.brittle
