The sprue pin/sprue hole used for sand moulds is
A.Tapered upwards
B.Tapered downwards
C.Has no taper at all
A.Tapered upwards
B.Tapered downwards
C.Has no taper at all
A.separates out impurities
B.prevents burning of magnesium alloys
C.facilitates production of sound cstings
D.all of the above
A.cast iron
B.aluminium alloys
C.alloy steels
D.bronze
A.0.1 percent
B.1 percent
C.4 percent
D.14 percent
A.Tungsten
B.Nickel
C.Steel
D.cast iron
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
A.1 mm/metre
B.5 mm/metre
C.14 mm/metre
D.25 mm/metre
A.0.1 to 0.2 percent
B.0.5 to 1 percent
C.2 to 4 percent
D.8 to 10 percent
A.permeability increases
B.moisture content increases
C.bonding content increases
D.all of the above
A.high moisture content of the sand
B.low permeability of sand
C.excessive fine grains and gas producing ingredients
D.any of the above