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

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

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Workshop Technology
Riddle is used for

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

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Workshop Technology
Lancing is the operation of

Bending a sheet of metal along a curved axis
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal in a straight line along the length
Cutting a sheet of metal through part of its length and then bending the cut portion

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