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

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

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Workshop Technology
The diaphragm moulding machine is used to

Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Give uniform sand hardness throughout the mould
Produce uniform packing of sand in the mould

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