Which of the following sand must possess high refractoriness?
A.Backing sand
B.Parting sand
C.Facing sand
D.all of the above
Category: Foundry Technology Mcqs
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
For sterite refractory bricks are attacked by
A.basic slags
B.acid slags
C.alkali compounds
D.all of the above
Refractories should have all the following properties EXCEPT:
A.Minimum contraction and expansion due to temperature variations
B.High electrical conductivity
C.Long life
D.Heat insulation
A blind riser can be located
A.in cope
B.in drag
C.in either cope or drag
D.in cheek only
