Workshop Technology
Riddle is used for

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

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Workshop Technology
For arc welding

Alternating current with high frequency is used
Direct current is used
Alternating current with low frequency is used
Any one of these

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