Workshop Technology
For gas welding, the pressure desired at the welding torch for oxygen is

7 to 103 kN/m²
70 to 280 kN/m²
560 to 840 kN/m²
280 to 560 kN/m²

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Workshop Technology
In a hot chamber die casting machine

Nonferrous alloys with high melting temperature are casted
Ferrous alloys with high melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Ferrous alloys with low melting temperature are casted

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

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