Workshop Technology
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

10 mm/m
26 mm/m
16 mm/m
20 mm/m

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Workshop Technology
For arc welding

Alternating current with low frequency is used
Alternating current with high frequency is used
Any one of these
Direct current is used

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Workshop Technology
A jolt machine is used to

Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform sand hardness throughout 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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