Workshop Technology
Riddle is used for

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

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Workshop Technology
In a simple die

Two or more cutting operations are performed at one station of the press in every stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
None of the listed here

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