Solidification time for riser should be
A.less than that of the casting
B.same as that for the casting
C.more than that of the casting
Category: Foundry Technology Mcqs
In case of copper, the pouring temperature is around
A.1450?C
B.1260?C
C.1160?C
D.1060?C
Phenolic thermo-setting plastics are finding application in pattern making because
A.they do not absorb moisture
B.they are strong
C.they are resistant to wear
D.they have all above qualities
The strength of the sand is high if grains are
A.round and small
B.sharp and irregular in shape
C.large and regular in shape
D.none of the above
Warped castings may be produced due to
A.poor collapsibility of cores
B.non-provision of camber allowance on the pattern
C.weak flasks
D.any of the above
Rough surface of casting may result from
A.high permeability of sand
B.large grain size
C.soft ramming
D.any of the above
The sand used for filling the bulk of the moulding flask
A.Facing sand
B.Floor sand
C.Dry-sand
The advantage of oxygen enriched cupola is
A.higher temperature of molten iron
B.high efficiency of cupola
C.reduced heat loss in waste gases
D.all of the above
By compacting the sand
A.density increases and permeability
B.density decreases and permeability increases
C.both density as well as permeability decrease
D.both density as well as permeability increase
The amount of coal dust added to moulding sand depends on
A.shape of the casting
B.thickness of the casting
C.temperature of pouring
D.none of the above
