Workshop Technology
In welding magnesium with TIG arc welding, direct current with ________ is used.

Reversed polarity
Straight polarity
Both (A) and (B)
None of these

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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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