Permeability of moulding sand is increased due to/by
A.Hard ramming
B.Soft ramming
C.Clay
Category: Foundry Technology Mcqs
The drawback with metallic pattern is
A.excessive weight
B.expensive
C.difficult to shape
D.all of the above
Annealing of aluminium castings
A.reduces tensile strength
B.improves ductility
C.relieves micro stresses
D.mechanical properties change
When wooden patterns with metallic coating are to be used, the metal sprayed on wooden pattern could be
A.bismuth
B.zinc
C.aluminium
D.any of the above
If ash content of coke used in cupola is high then
A.melting rate will be low
B.more of flux will be required
C.castings produced will have blow holes
D.carbon content of castings will be low
Sweep patterns are used to prepare mould of
A.symmetrical and regular shapes
B.unsymmetrical and regular shapes
C.unsymmetrical and irregular shapes
D.none of the above
A cupola one metre in diameter and 4 metres in height will melt in one hour about
A.0.5 tonnes of iron
B.2 tonnes of iron
C.5 tonnes of iron
D.10 tonnes of iron
White cst iron contains
A.free graphite
B.cementite
C.free carbon
D.none of the above
The percentage of sulphur in pig iron is generally
A.0.01% to 0.3%
B.0.3% to 0.55%
C.0.6% to 0.79%
D.0.8% to 0.9%
Chaplets are
A.core binders
B.core supports
C.core projections
D.mould seats to support core
