31. Thermit, used in Thermit welding, is a mixture of
32. For smoothing and cleaning out depressions in the mould, a ________ is used.
33. In order to produce uniform packing of sand in the moulds, a _________ is used.
34. In order to ram the sand harder at the back of the mould and softer on the pattern face, a ________ is used.
35. When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.
36. In order to deliver molten metal from pouring basin to gate, a ________ is used.
37. In welding magnesium with TIG arc welding, direct current with ________ is used.
38. For welding plates of thickness more than 12.5 mm, its edges
39. A rip saw
40. A jolt machine is used to
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