Cementite
A.is a compound of iron and carbon
B.is characterized by an orthorhombic crystal structure
C.has the approximate chemical formula Fe3C
D.all of these answers
Category: Materials of Construction Mcqs
Nitriding of steel is done for
A.hardening the surface of steel
B.hardening the steel
C.softening the steel surface
D.softening the steel
Rust of iron is
A.powdered iron
B.ferrous oxide
C.hydrated ferric oxide
D.none of the above
Which one of the following reactions does not take place at cathode ?
A.Cl- ? Cl+ e-
B.H+ + e- ? H
C.Ag+ + e- ? Ag
D.Cu2+ +2e- ? Cu
Which of the following has maximum melting point?
A.Wrought iron
B.White cast iron
C.Steel
D.Grey cast iron
Erosion is the deterioration of metals by
A.the corrosive action of fluids only
B.the abrasive action of fluids only
C.both corrosive action and abrasive action of fluids
D.none of the above
Which of the following is most readily corroded in air?
A.Copper
B.Iron
C.Tin
D.Silver
Carbon content of
A.steel is in between those of cast iron and wrought iron
B.cast iron is in between those of steel and wrought iron
C.pig iron is in between those of steel and wrought iron
D.wrought iron is in between those of steel and cast iron
Brittleness of a substance is a property of substance which describes its
A.shining
B.ability to be polished
C.ability to be drawn into wires
D.tendency to fracture without appreciable deformation
Galvanised iron is
A.easy to be painted
B.of better look
C.protected from rusting
D.harder
