A.Boric acid
B.Sublimed sulphur
C.Fluoric additives
D.Any of the above
Related Mcqs:
- Which of the following is used on moulds for magnesium castings to prevent metal mould reactions?
- Refractoriness in the moulding sand is due to the presence of
- As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have
- The sand mass does not fall out of the moulding box but is held firmly in it when the moulding box is lifted. This is due to the property of
- Oleum is
- Which one of the following reactions is not an exothermic
- What do you call the rain that contains chemical waste and cause damage to plants and animals?
- Magnesium aluminium alloys are grain refined by addition of
- The permeability of moulding sand depends on
- The purpose of clay in a moulding sand is to
