Which wood is difficult to machine?
A.Freshly failed wood
B.Old and used wood
C.Kiln dried wood
D.Seasoned wood
Category: Foundry Technology Mcqs
Sand grains which give high mould strength are
A.Rounded grains
B.Sharp or Angular grains
C.Sub-angular grains
Permeability of moulding sand is increased due to/by
A.Hard ramming
B.Soft ramming
C.Clay
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
