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

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

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Workshop Technology
Linde welding uses

Carburising flame and rightward technique
Oxidizing flame and leftward technique
Neutral flame and rightward technique
Neutral flame and leftward technique

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Workshop Technology
Piercing is an operation of cutting

A number of holes evenly spaced in a regular pattern on a sheet of metal
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A cylindrical hole in a sheet of metal by the punch and the die
A flat sheet to the desired shape

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

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

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Workshop Technology
During hot working of metals

Mechanical properties are improved due to refinement of grains
All of the listed here
Porosity of the metal is largely eliminated
Grain structure of the metal is refined

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