Pure iron melts at 1500?C. Presence of carbon
A.reduces the melting point
B.increases the melting point
C.does not change the melting point
Category: Foundry Technology Mcqs
The melting unit is an integral part of
A.the cold chamber diecastings machine
B.the hot chamber die casting machine
C.both (A) and (B) above
Which of the following is the anti-penetration material introduced in the moulding sand?
A.Coad dust
B.Powdered quartz
C.Black oil
D.all of the above
Pit furnace can be used for the melting of
A.cast iron
B.aluminium
C.brass
D.any of the above
Addition of saw dust to moulding sand increases its
A.gas permeability
B.refractoriness
C.cohesiveness
D.all of the above
As a result of melting of cast iron in cupola, which of the following constituent undergoes least change in its percentage?
A.Silicon
B.Sulphur
C.Manganese
D.Phosphorous
First step in reclaiming the moulding and core sand is
A.addition of moisture
B.reproportioning of binder
C.separation of metal particles
D.any of the above
Which of the following is used to increase refractoriness of sand?
A.Graphite
B.Silica flour
C.Iron free zirconium
D.all of the above
Which of the following defect is likely to occur due to improper design of gatting system?
A.Shrinkage
B.Porosity
C.Mould erosion
D.any of the above
Inoculants are added to aluminium mainly for
A.grain refinement
B.directional solidification
C.purification
D.all of the above
