For grey cast iron the pouring temperature is
A.1510 to 1532?C
B.1455 to 1495?C
C.1400 to 1465?C
D.1250 to 1290?C
Category: Foundry Technology Mcqs
Which of the following is used as protective admixture in moulding sand for magnesium castings?
A.Boric acid
B.Sublimed sulphur
C.Fluoric additives
D.Any of the above
The order of surface finish possible in die castings is
A.0.0008 microns
B.0.008 microns
C.0.08 microns
D.0.8 microns
In furan process, furan resins are primarily used as
A.binders
B.chemicals for exothermic reactions
C.fluxes
D.none of the above
In case of cored aluminium castings, the contraction allowance is
A.more than the normal allowance
B.less than the normal allowance
C.same as the normal allowance
Pig iron is obtained from iron ore, in a blast furnace by the process of
A.oxidation
B.reduction
C.carbonation
D.desulphurisation
Investment casting finds application in all of the following EXCEPT:
A.Milling cutters
B.Gold ornaments
C.Jet engine nozzles
D.Buckets for superchargers
Clay used for foundry sand should be
A.kaolinite
B.montmorillonite
C.illite
D.any of the above
According to Chvorinov’s equation, the solidification time of castings is
A.directly proportional to the volume of the castings
B.Directly proportional to square of the volume of the casting
C.inversely proportional to square of the volume of the casting
D.inversely proportional to the volume the casting
For annealing of aluminium it is heated to
A.325?C
B.425?C
C.525?C
D.625?C
