Workshop Technology
A taper provided on the pattern for its easy and clean withdrawal from the mould is known as

Draft allowance
Shrinkage allowance
Distortion allowance
Machining allowance

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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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