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

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

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

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