Workshop Technology
Thermit, used in Thermit welding, is a mixture of

Charcoal and aluminium
Charcoal, iron oxide and aluminium
Charcoal and iron oxide
Iron oxide and aluminium

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Workshop Technology
Swab is used for

Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern

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