In investment casting the pattern is made of
A.wood
B.urea formaldehyde
C.wax
D.none of the above
Category: Foundry Technology Mcqs
Swab is used for
A.applying water to the mould around the edge of the pattern
B.shaking pattern to facilitate its with drawl from the mould
C.repairing and finishing of mould
D.none of the above
While selecting wood for patterns, one should
A.discard the rot
B.select the cross-grained woods
C.select the fresthy filled wood
D.discard the seasoned wood
Coke used in cupola is in the form of
A.coal dust
B.pulverized coal
C.lumps
D.any of the above
Which heat treatment is applicable to aluminium alloy castings?
A.Stabilizing
B.Solution heat treatment
C.Artificial ageing
D.all of the above
Distortion in castings can be reduced by
A.modifying design
B.providing sufficient machining allowance
C.improving foundry practice
D.all of the above
On the interior surfaces the draft allowance is usually
A.10 to 20 mm/metre
B.40 to 60 mm/metre
C.100 to 120 mm/metre
D.200 to 225 mm/metre
Permanent mould casting is also known as
A.gravity die casting
B.chill casting
C.slush casting
D.short casting
Shell moulding is uneconomical for
A.small castings
B.large scale production
C.small scale production
D.all of the above
The most suitable metals for die casting are
A.zinc and its alloys
B.copper and its alloys
C.aluminium and its alloys
D.none of the above
