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
Swab is used for

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

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