Workshop Technology
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

Less than 0.1 percent
More than 0.3 percent
Anywhere between 0.1 to 1 percent
Less than 0.3 percent

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Workshop Technology
For arc welding

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

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