The permeability of moulding sand depends on
A.grain size
B.grain shape
C.moisture content
D.all of the above
Category: Foundry Technology Mcqs
In copper alloy foundry which of the following is used to prevent the molten metal from being oxidized?
A.charcoal
B.bone ash
C.phophorous
D.calcium carbonate
Which of the following is not necessarily the characteristic of investment casting?
A.Extreme dimensional accuracy
B.Excellent surface finish
C.Low cost
D.No disfiguring parting line as found on castings made by cope and drag methods
When external features of the castings are important, which of the following method of casting is preferred?
A.Die casting
B.Dry sand casting
C.Slush casting
D.Carbondioxide casting
Chaplets are provided to
A.reduce core sag
B.support heavy cores
C.compensate for inadequate coreseats
D.all of the above
In carbondioxide moulding the pressure of carbondioxide is around
A.1.5 kg/cm2
B.15 kg/cm2
C.150 kg/cm2
D.500 kg/cm2
The purpose of clay in a moulding sand is to
A.Mak the mould permeable
B.Act as a binder in the mould
C.Make the mould refractory
All of the following operations on castings are carried out for surface appearance improvement EXCEPT:
A.Enamelling
B.Electroplating
C.Galvanising
D.Chilling
For producing several similar parts from a single mould the moulding used is
A.bench moulding
B.floor moulding
C.plate moulding
D.none of the above
The advantage of investment casting is
A.high degree of accuracy
B.adaptability to casting of most of the metals
C.complex shaped articles can be cast
D.all of the above
