Workshop Technology
In a bilateral system of tolerance, the tolerance is allowed on

Both sides of the actual size
One side of the actual size
Both sides of the nominal size
One side of the nominal size

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Workshop Technology
For arc welding

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

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Workshop Technology
During hot working of metals

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

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