Workshop Technology
The diaphragm moulding 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
Give uniform sand hardness throughout the mould
Produce uniform packing of sand in the mould

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed

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Workshop Technology
During hot working of metals

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

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