Workshop Technology
The instrument used to measure external and internal diameter of shafts, thickness of parts and depth of holes, is

Inside micrometer
Depth gauge micrometer
Vernier caliper
Outside micrometer

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Workshop Technology
Riddle is used for

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

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