In fluminium foundry, for removing dissolved hydrogen and the entrapped dross, the flux used is
A.nitrogen
B.helium
C.chlorine
D.any of the above
Category: Foundry Technology Mcqs
Graphite is sprinkled on to the surface of green sand moulds to
A.exclude the burn out effect
B.improve surface finish
C.minimize surface finish
D.reduce the number of blow holes
Shell moulding can be used for
A.producing thin castings
B.better surface finish
C.tolerances of the order of 0.002 mm per mm
D.all of the above
The function of ejection pin in die casting is to
A.pushout casting off the die
B.provide movable core spaces
C.facilitate die casting of several components
D.none of the above
As the moisture content of sand increases
A.permeability increases
B.permeability decreases
C.permeability remains unchanged
Shatter test is a measure of
A.sand toughness
B.sand adhesiveness
C.sand cohesiveness
D.none of the above
Wax patterns are used in
A.non-ferrous castings
B.investment casting process
C.machine moulding process
D.all of the above
High silicon irons are
A.resistant to wear
B.machinable
C.malleable
D.brown in colour
Hairlines in die casted materials result from
A.chemical attack
B.mechanical erosion
C.thermal fatigue
D.all of the above
The method in which green sand is generally used is
A.pit moulding
B.plate moulding
C.bench moulding
D.none of the above
