Pattern maker’s contraction rules are
A.different for different materials of patterns
B.different for different materials of castings
C.same for all materials of castings
A.different for different materials of patterns
B.different for different materials of castings
C.same for all materials of castings
A.Moulds are cheapest
B.Preparation of moulds is less time consuming
C.Defect free and castings with good surface is obtained
D.none of the above
A.Yellow brass
B.Manganese
C.Aluminium bronzes
D.All of the above
A.plates
B.cylindrical bars
C.square sections
D.trapezoidal moulds
A.along the grains
B.across the grains
C.along the direction of tangent to the annular rings
A.0.1 tonne
B.0.2 tonne
C.2 tonnes
D.20 tonnes
A.rolls
B.chills
C.ingots
D.pigs
A.parting surface of two dies
B.vents between the dies
C.ejection pins
D.gatting system
A.ferrous foundries
B.non-ferrous foundries
C.both (A) and (B) above
A.very thin sections
B.regular sections
C.heavy and thick walled sections
D.all of the above