Workshop Technology
A neutral flame is obtained by supplying

More volume of oxygen and less volume of acetylene
None of the listed here
More volume of acetylene and less volume of oxygen
Equal volumes of oxygen and acetylene

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Workshop Technology
The diaphragm moulding machine is used to

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

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