Workshop Technology
The directional solidification in casting can be improved by using

Chaplets and padding
Chills, chaplets and padding
Chills and padding
Chills and chaplets

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Workshop Technology
Riddle is used for

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

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