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

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

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Workshop Technology
Notching is the operation of

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

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the negative terminal and the electrode holder is earthed

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