Workshop Technology
The metal extrusion process is generally used for producing

Uniform solid and hollow sections
Varying solid and hollow sections
Uniform solid sections
Uniform hollow sections

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

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