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.

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