Workshop Technology
Swab is used for

Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern

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Workshop Technology
A progressive limit gauge has

None of the listed here
Separate 'Go' and 'Not go' members
'Go' and 'Not go' member on the same side of the gauge
'Go' member at one end and 'Not go' member at the other end

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