Workshop Technology
A ring gauge is used to

Test the accuracy of holes
Check the clearance between two mating surfaces
All of these
Check the diameter of shafts or studs

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Workshop Technology
Sand wash is a casting defect which

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

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