Which variety of cast iron can be forged?
A.Grey cast iron
B.High silicon cast iron
C.Wrought iron
D.All of the above
Category: Foundry Technology Mcqs
For aluminium alloys grain refinement can be achieved using
A.titanium
B.boron
C.zirconium
D.any of the above
Oil used for core sand is
A.molasses
B.linseed oil
C.mineral oil
D.any of the above
Shrinkage cavity in a casting may be formed due to
A.haphazard solidification of metal
B.improperly sized gating
C.high pouring temperatures
D.any of the above
When sulphur is to be removed from cast iron while melting the same in cupola, the flux used is
A.molasses
B.sodium carbonate with lime stone
C.zinc sulphate with lime stone
D.none of the above
Chaplets are made of
A.core sand
B.organic matter
C.wood
D.metal
Plaster patterns and core boxes are made of
A.Plaster of Paris
B.Gypsum cement
C.Bone china clay
D.White powder
The defect known as ‘drop’ occurs when the upper surface of the mould cracks and pieces of sand fall into the molten metal. This defect occurs due to
A.low mould hardness
B.insufficient reinforcement
C.low green strength
D.any of the above
Presence of sulphur in cast iron
A.retards fluidity
B.promotes brittleness
C.promotes oxidation
D.all of the above
Thermal efficiency of cupola is in the range
A.80 to 90 percent
B.60 to 75 percent
C.50 to 65 percent
D.30 to 50 percent
