Workshop Technology
Riddle is used for

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

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Workshop Technology
In permanent mould casting method

Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is forced into mould under high pressure
Molten metal is poured and allowed to solidify while the mould is revolving
None of these

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