If dross and slag along with the liquid metal reach the mould cavity they produce the defect known as_______________?
A. Misrun
B. Inclusions
C. Blow holes
D. All of the above
Category: Foundry Technology Mcqs
Slag and dross can be removed by ________________?
A.skimming from the molten metal
B.using bottom pouring ladle
C.using pouring basin in place of a pouring cup
D.any of the above
The methods of casting for producing ornamental pieces are ____________?
A.pressed and slush casting
B.slush and gravity casting
C.gravity and semi permanent mould casting
D.none of the above
Continue reading “The methods of casting for producing ornamental pieces are ____________?”
Metal moulds are used in all of the following EXCEPT:
A.Die casting process
B.Investment casting
C.Permanent mould casting
D.Centrifugal casting
Mixing coal dust with moulding sand results in
A.blackening of the mould
B.strong mould
C.good air venting
D.none of the above
Hot spots are generally found in castings
A.having abrupt variation in section
B.with uniform cross-section
C.symmetrical about two axes
D.small in weight but large in volume
Flux used in cupola while melting cast iron is
A.lime stone
B.coke slurry
C.molasses
D.any of the above
Which of the following defect may occur due to improper design of gating system?
A.Cold shuts
B.Rough surfaces
C.Misruns
D.any of the above
On drying, wood
A.expands
B.shrinks
C.changes colour
If an old casting is to be used as a pattern, to account for various allowances.
A.casting is shaken while withdrawing from mould
B.the surfaces are lagged with thin strips of wood or leater
C.the castings are cleaned and made smooth
D.to provide draw screws, holes can be drilled and tapped in the castings
