Addition of nickel to cast iron increases
A.hardness
B.corrosion resistance
C.tensile strength
D.all of the above
Category: Foundry Technology Mcqs
The sprue pin/sprue hole used for sand moulds is
A.Tapered upwards
B.Tapered downwards
C.Has no taper at all
Use of flux in melting of magnesium
A.separates out impurities
B.prevents burning of magnesium alloys
C.facilitates production of sound cstings
D.all of the above
Die casting dies are generally made of
A.cast iron
B.aluminium alloys
C.alloy steels
D.bronze
The solidification shrinkage of magnesium alloys is about
A.0.1 percent
B.1 percent
C.4 percent
D.14 percent
Highest melting point metal is
A.Tungsten
B.Nickel
C.Steel
D.cast iron
Gated patterns are normally used for
A.mass production of small castings
B.production of castings which do not require machining
C.castings having several hollow spaces
D.castings for light metals
The contraction allowance for magnesium is around
A.1 mm/metre
B.5 mm/metre
C.14 mm/metre
D.25 mm/metre
The solidification shrinkage of carbon steel is around
A.0.1 to 0.2 percent
B.0.5 to 1 percent
C.2 to 4 percent
D.8 to 10 percent
Permeability of sand decreases as
A.permeability increases
B.moisture content increases
C.bonding content increases
D.all of the above
