Workshop Technology
Riddle is used for

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

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Workshop Technology
During hot working of metals

Mechanical properties are improved due to refinement of grains
Porosity of the metal is largely eliminated
All of the listed here
Grain structure of the metal is refined

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Workshop Technology
In a compound die

Only one operation is performed at each 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
Two or more cutting operations are performed at one station of the press in every stroke of the ram

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