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

Inside micrometer
Vernier caliper
Depth gauge micrometer
Outside micrometer

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Workshop Technology
The diaphragm moulding machine is used to

Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Give uniform sand hardness throughout the mould

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