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

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

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Workshop Technology
A jolt machine is used to

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

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Workshop Technology
During hot working of metals

Grain structure of the metal is refined
Porosity of the metal is largely eliminated
All of the listed here
Mechanical properties are improved due to refinement of grains

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