A.grain refinement
B.directional solidification
C.purification
D.all of the above
Related Mcqs:
- Heat treatment of castings is usually done for
- The location of riser least depends on
- The purpose of sometimes adding exothermic materials to sand is
- Chromium when added as an alloying element to steels
- The grain size of moulding sand is expressed in terms of
- The permeability of moulding sand depends on
- 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
- Normal shrinkage allowance for aluminium is 18 mm per metre and that for cast iron 10 mm per metre. If the metal pattern is to be made of aluminium and the casting is to be of cast iron, the shrinkage allowed on wooden master pattern will be
- Shrinkage cavity in a casting may be formed due to
- For annealing of aluminium it is heated to
