Workshop Technology
Sand wash is a casting defect which

Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the casting

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Workshop Technology
A progressive limit gauge has

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

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