In low temperature die casting the metals whose alloys are cast are
A.aluminium and zinc
B.zinc and copper
C.copper, zinc and lead
D.none of the above
Category: Foundry Technology Mcqs
Which of the following is used to obtain fine surface finish in ferrous castings?
A.Ground pitch
B.Sea coal
C.Gilsonite
D.any of the above
In die casting
A.the product surface is smooth and clean without the parting line
B.there is no need of air venting
C.there is no restriction of material, any material that can be poured can be cast
D.the heat loss from molten metal is fast as the mould is metallic
Which of the following sand must possess high refractoriness?
A.Backing sand
B.Parting sand
C.Facing sand
D.all of the above
A casting process which can produce hollow cylinder without use of core is
A.permanent mould casting
B.semi permanent mould casting
C.pressed casting
D.none of the above
A pit furnace can be used for the melting of
A.cast iron
B.brass
C.aluminium
D.all of the above
In case of plaster moulding the mould is prepared in
A.gypsum plaster
B.slacked lime
C.lime + cement
D.any of the above
Molybdenum upto 1.5% is added to cast iron to
A.improve strength
B.reduce wear resistance
C.increase machinability
D.all of the above
In case of malleable iron castings, the contraction allowance on pattern
A.increass as the section thickness of casting increases
B.decreases as the section thickness of casting increases
C.is independent of section thickness
In die castings, heavy local sections are usually avoided and replaced by
A.channel sections
B.corrugated forms
C.ribs
D.any of the above
