Manufacturing And Production Technology
A ring gauge is used to measure

Both outside diameter and roundness
Only external threads
Roundness but not outside diameter
Outside diameter but not roundness

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Manufacturing And Production Technology
The primary purpose of a sprue in a casting mould is to

Feed the casting at a rate consistent with the rate of solidification
Help feed the casting until all solidification takes place
Act as a reservoir for molten metal
Feed molten metal from the pouring basin to the gate

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