Workshop Technology
Which of the following welding method uses a pool of molten metal?

Carbon arc welding
TIG arc welding
MIG arc welding
Submerged arc welding

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Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout the mould
Produce uniform packing of sand in the mould
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

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