For sterite refractory bricks are attacked by
A.basic slags
B.acid slags
C.alkali compounds
D.all of the above
Category: Foundry Technology Mcqs
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
Shell moulding is a process in which
A.a thin shell is cast in sand mould
B.a strong core is prepared
C.a mould comprising thin shell is produced by mixing dry silica and resin binder
In case of arc furnaces electric supply for electrodes consists of
A.low voltage and high current
B.high voltage and high current
C.high voltage and low current
D.low voltage and low current
Padding is
A.a method for production of chilled castings
B.an extra support for thin castings
C.an extra metal added to the original uniform section of the casting
D.none of the above
All of the following are clamping tools EXCEPT:
A.Hard screw
B.Pich dog
C.C-clamp
D.Brace
Swelling of castings may occur due to
A.insufficient ramming
B.rapid pouring of molten metal
C.insufficient weight on the moulds during pouring
D.any of the above
Heat treatment of castings is usually done for
A.refinement of grain structure
B.improving machinability
C.relieving internal stress
D.any of the above
As a result of melting in cupola, the percentage of all of the following constituents decreases EXCEPT:
A.Silicon
B.Sulphur
C.Carbon
D.Phosphorous
